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| author | Alyssa Rosenzweig <alyssa@rosenzweig.io> | 2017-03-17 22:24:25 -0700 |
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| committer | Alyssa Rosenzweig <alyssa@rosenzweig.io> | 2017-03-17 22:24:25 -0700 |
| commit | dbc480fb28a694ad5a587be025eabfded7c7784b (patch) | |
| tree | 16b4251dcbdede274781f7bb8b1f23570853f3bb /docs/future | |
| parent | 85ec6862e8af0747420ca15fef7100edb5885302 (diff) | |
| download | librebootfr-dbc480fb28a694ad5a587be025eabfded7c7784b.tar.gz librebootfr-dbc480fb28a694ad5a587be025eabfded7c7784b.zip | |
Convert documentation to markdown
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| -rw-r--r-- | docs/future/old.html | 319 | ||||
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diff --git a/docs/future/index.html b/docs/future/index.html deleted file mode 100644 index 57aaa37f..00000000 --- a/docs/future/index.html +++ /dev/null @@ -1,598 +0,0 @@ -<!DOCTYPE html> -<html lang="en"> -<head> - <meta charset="utf-8"> - <title>libreboot tutorials</title> - - <style type="text/css"> - @import url('../css/main.css'); - </style> - - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - <meta name="author" content="glugman"> - <meta name="description" content="tutorials for libreboot, the reboot library."> - <meta name="robots" content="all"> -</head> - -<body> - - <div class="section"> - - <h1 id="pagetop">Development notes</h1> - <p> - These are development notes, for future use. For old (obselete) notes, see <a href="old.html">old.html</a>. - </p> - <p> - Or go <a href="../tasks.html">back to main task list</a>. - </p> - - </div> - - <div class="section"> - - <h1>Table of contents</h1> - <ul> - <li><a href="#standard_test">Standard test</a></li> - <li><a href="#t60_cpu_microcode">T60 cpu microcode</a></li> - <li><a href="#i945_vram_size">i945 VRAM size</a></li> - <li><a href="#lcd_i945_incompatibility">LCD panels on i945 - fix incompatible panels</a></li> - <li><a href="#i945_vbt">i945 X60/T60 VBT implementation (experimental: testing)</a></li> - <li><a href="#intelvbttool_results">IntelVbtTool results</a></li> - <li><a href="#fallback_patches">Fallback patches for i945</a></li> - </ul> - - </div> - - <div class="section"> - - <h1 id="standard_test">standard test</h1> - <p> - These logs are usually obtained when testing changes related to graphics on i945 (X60 and T60). - </p> - <ul> - <li> - Make a copy of these files: - <ul> - <li>/var/log/dmesg</li> - <li>/var/log/kern.log</li> - <li>/var/log/Xorg.0.log</li> - <li>/proc/ioports</li> - <li>/proc/iomem</li> - <li>/sys/class/drm/card0/error</li> - </ul> - </li> - <li> - Record these outputs: - <ul> - <li>sudo intel_reg_dumper</li> - <li>uname -r</li> - <li>lspci -vvvvnnnnxxxx</li> - <li>sudo modprobe msr</li> - <li>sudo inteltool -a</li> - <li>sudo cbmem -c</li> - </ul> - </li> - <li> - Try some 3D games with latest kernel. - </li> - </ul> - - <p><a href="#pagetop">Back to top of page.</a></p> - - </div> - - <div class="section"> - - <h1 id="t60_cpu_microcode">T60 cpu microcode</h1> - - <p> - TODO: T60: find (for rare buggy CPUs that are unstable without microcode updates) if there is a workaround (patched kernel, special parameter, etc) So far, only 1 processor has been found to have issues. See microcode errata sheets http://download.intel.com/design/mobile/SPECUPDT/31407918.pdf and http://download.intel.com/design/mobile/SPECUPDT/30922214.pdf and then look at the debugging results collected in <a href="../t7200q">t7200q</a> directory (q means quirk). - </p> - - <p> - Every other T7200 tested so far has worked without microcode updates. - </p> - - <p><a href="#pagetop">Back to top of page.</a></p> - - </div> - - <div class="section"> - - <h1 id="i945_vram_size">i945 VRAM size</h1> - - <p> - Apparently, only 8MB VRAM is available on i945 GPUs (though it could do 64MB):<br/> - phcoder: No. Hardware default is 8 MiB. When I wanted to make it configurable, I saw that docs mention only one other alternative: 1MiB. Later isn't event enough for 1024x768 at 24bpp without any acceleration or double buffering. It's possible that there are undocumented values. Which options do you have in vendor BIOS? - How to find out how much vram you have:<br/> - phcoder: TOM - BSM<br/> - phcoder: check what vendor BIOS offers as options<br/> - vimuser: I thought it could do 64MB usually<br/> - phcoder: not accorging to doc.<br/> - phcoder: see mobile-945-express-chipset-datasheet page 93<br/> - phcoder: see also src/northbridge/intel/i945/{early_init,northbridge,gma}.c<br/> - vimuser: "011 = DVMT (UMA) mode, 8 MB of memory pre-allocated for<br/> - vimuser: frame buffer."<br/> - vimuser: "Others - reserved"<br/> - phcoder: the easiest way is a loop at this position which tries different values and reads (and prints) BSM with them<br/> - stefanct: vimuser: they suggest that you change the value and look how BSM reacts to that<br/> - stefanct: as they pointed out earlier vram size = TOM - BSM<br/> - stefanct: different values of GMS<br/> - stefanct: phcoder: hm... this could be a hint. look at the text description of TOLUD at page 103<br/> - stefanct: it mentions 64 MB in the text about BSM as well<br/> - stefanct: table 18...<br/> - phcoder: stefanct: I have a guess which value make is 64 but I will not tell to avoid skewing test results<br/> - stefanct: phcoder: sure... i assumed you were not sure if it supports it at all. testing it properly is of course a good idea :)<br/> - stefanct: test the various possible (but reserved) values of GMS and see what the resulting VRAM size is<br/> - vimuser: so, TOM - BSM - </p> - <p> - <a href="#pagetop">Back to top of page.</a> - </p> - - </div> - - <div class="section"> - - <h1 id="lcd_i945_incompatibility">LCD panels on i945 - fix incompatible panels</h1> - - <p> - Fix T60 issues (see incompatible panels listed at <a href="../hcl/#supported_t60_list">../hcl/#supported_t60_list</a>). - </p> - - <p> - Run that tool (resources/utilities/i945gpu/intel-regs.py) as root on systems with the offending panels in: - </p> - <ul> - <li>Coreboot (or libreboot, whatever) with VBIOS (disable native graphics also)</li> - <li>(Factory BIOS also?)</li> - </ul> - - <p> - This shows values in devicetree.cb and src/northbridge/intel/i945/gma.c, the idea is that you run it on factory bios or vbios - and that it will (might) show different values: then you try those in the native graphics (in libreboot). - </p> - - <p> - Other values/registers might also need to be added to the script for these tests. - </p> - - <p> - check if intel_bios_reader from intel-gpu-tools reports the same value (BIOS has a hardcoded value) for PWM modulation frequency. - This file can read the VBIOS (64K dump). - </p> - - <p> - Check other tools in intel-gpu-tools aswell, compare outputs. Possibly add more information to intel-regs.py output (submit changes to mtjm). - Do oprom trace / replay (<a href="http://www.coreboot.org/User:GNUtoo#How_to_get_rid_of_the_vbios_of_the_x60_.5BNew_Version.5D">http://www.coreboot.org/User:GNUtoo#How_to_get_rid_of_the_vbios_of_the_x60_.5BNew_Version.5D</a>) - </p> - - <p> - Study how EDID works and how gma.c handles it. - </p> - - <p> - Original getregs.py script can be found at <a href="http://hg.mtjm.eu/scripts/file/tip/intel-regs.py">http://hg.mtjm.eu/scripts/file/tip/intel-regs.py</a> - written by Michał Masłowski. - </p> - - <p> - About fixing remaining LCD panels on 5345:<br/> - 'polarity' is mentioned in coreboot log (cbmem -c). compare output (with working and non-working panel). (and see the other notes in docs/future/) - </p> - <p> - There was a theory that working panels are - 6bpc (bits per colour) and nonworking are - 8bpc, but all EDIDs that we have here are - for 6bpc panels. - </p> - <p>We should compare coreboot logs - (from <code>cbmem -c</code> from systems with - working and nonworking panels.</p> - <p>How to dump EDID:</p> - <p> - # <b>apt-get install i2c-tools</b><br/> - # <b>modprobe i2c-dev</b><br/> - Find out the correct ID to use:<br/> - # <b>i2cdetect -l</b><br/> - Example:<br/> - # <b>i2cdump -y 2 0x50</b> - </p> - - <p> - Working panel: EDID dump from LG-Philips LP150E05-A2K1: - </p> -<pre> -No size specified (using byte-data access) - 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef -00: XX ff ff ff ff ff ff 00 30 ae 43 40 00 00 00 00 X.......0?C@.... -10: 00 0f 01 03 80 1e 17 78 ea af 00 99 58 53 8c 2a .??????x??.?XS?* -20: 25 50 54 21 08 00 81 80 01 01 01 01 01 01 01 01 %PT!?.?????????? -30: 01 01 01 01 01 01 30 2a 78 20 51 1a 10 40 30 70 ??????0*x Q??@0p -40: 13 00 31 e4 10 00 00 18 28 23 78 20 51 1a 10 40 ?.1??..?(#x Q??@ -50: 30 70 13 00 31 e4 10 00 00 18 00 00 00 0f 00 90 0p?.1??..?...?.? -60: 43 32 90 43 28 14 06 00 32 0c 00 00 00 00 00 fe C2?C(??.2?.....? -70: 00 4c 50 31 35 30 45 30 35 2d 41 32 0a 20 00 9b .LP150E05-A2? .? -80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -</pre> - - <p> - Working panel: EDID dump from Boe-Hydis HT14P12-100 FRU: 13N7061 (Inverter FRU: 41W1010) - </p> - -<pre> - 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef -00: 00 ff ff ff ff ff ff 00 30 ae 22 40 00 00 00 00 ........0?"@.... -10: 00 0f 01 03 80 1c 15 78 ea af 40 95 56 4a 8f 25 .??????x??@?VJ?% -20: 20 50 54 21 08 00 81 80 01 01 01 01 01 01 01 01 PT!?.?????????? -30: 01 01 01 01 01 01 30 2a 78 20 51 1a 10 40 30 70 ??????0*x Q??@0p -40: 13 00 1d d6 10 00 00 19 25 23 78 20 51 1a 10 40 ?.???..?%#x Q??@ -50: 30 70 13 00 1d d6 10 00 00 19 00 00 00 0f 00 90 0p?.???..?...?.? -60: 43 32 90 43 28 0f 01 00 09 e5 00 00 00 00 00 fe C2?C(??.??.....? -70: 00 48 54 31 34 50 31 32 2d 31 30 30 0a 20 00 3f .HT14P12-100? .? -80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -</pre> - -<p>LTN141XA-L01: revert to libreboot git commit c943281 to see this</p> - - <p> - <b>Non-</b>working panel: EDID dump from Samsung LTN150XG-L08: - </p> -<pre> - 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef -00: 00 ff ff ff ff ff ff 00 30 ae 40 40 00 00 00 00 ........0?@@.... -10: 00 0f 01 03 80 1f 17 78 ea 2d 05 97 57 51 8a 27 .??????x?-??WQ?' -20: 23 50 54 21 08 00 01 01 01 01 01 01 01 01 01 01 #PT!?.?????????? -30: 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88 ??????d?.@A.&0?? -40: 36 00 30 e4 10 00 00 19 28 15 00 40 41 00 26 30 6.0??..?(?.@A.&0 -50: 18 88 36 00 30 e4 10 00 00 19 00 00 00 0f 00 61 ??6.0??..?...?.a -60: 43 32 61 43 28 14 01 00 4c a3 58 47 00 00 00 fe C2aC(??.L?XG...? -70: 00 4c 54 4e 31 35 30 58 47 2d 4c 30 38 0a 00 6d .LTN150XG-L08?.m -80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ -</pre> - <p><a href="#pagetop">Back to top of page.</a></p> - - </div> - - <div class="section"> - - <h1 id="i945_vbt">i945 gfx: X60/T60 VBT implementation (experimental: testing)</h1> - - <p> - intel_bios_dumper in intel-gpu-tools seems interesting. - </p> - <p> - <b>Use 'drm.debug=0x06' kernel parameter when booting in grub!</b> - </p> - <p> - Before each test run, boot a live USB and delete the old logs in /var/log (kernel log, xorg log, dmesg and so on). - </p> - <p> - Load (from the ROM) the runningvga.bin for each LCD panel on each system; do not execute it, only load it! (coreboot will have to be modified). - Rename the ROM appropriately, based on the system name and the panel name. coreboot_nativegfx_5868_plusrunningvga_t60_14_LTD141ECMB.rom, - for instance. Keep a copy for later use. - </p> - - <p>You are supposed to:</p> - <ul> - <li>enable native graphics in menuconfig</li> - <li>include the self-modified VGA ROM (load, but not execute) - for reverse engineering the correct VBT tables.</li> - </ul> - - <p> - With each boot, make notes about what you see and get logs using the <a href="#standard_test">standard test</a>. - You will need the files from <a href="#intelvbttool_results">#intelvbttool_results</a> for each system. - </p> - - Results (# means untested): - <ul> - <li> - <b>X60/X60s:</b> - <ul> - <li>TMD-Toshiba LTD121ECHB: #</li> - <li>CMO N121X5-L06: #</li> - <li>Samsung LTN121XJ-L07: #</li> - <li>BOE-Hydis HT121X01-101: #</li> - </ul> - </li> - <li> - <b>X60T XGA:</b> - <ul> - <li>BOE-Hydis HV121X03-100: #</li> - </ul> - </li> - <li> - <b>X60T SXGA+:</b> - <ul> - <li>BOE-Hydis HV121P01-100: #</li> - </ul> - </li> - <li> - <b>T60 14" XGA:</b> - <ul> - <li>Samsung LTN141XA-L01: #</li> - <li>CMO N141XC: #</li> - <li>BOE-Hydis HT14X14: #</li> - <li>TMD-Toshiba LTD141ECMB: #</li> - </ul> - </li> - <li> - <b>T60 14" SXGA+</b> - <ul> - <li>TMD-Toshiba LTD141EN9B: #</li> - <li>Samsung LTN141P4-L02: #</li> - <li>Boe-Hydis HT14P12: #</li> - </ul> - </li> - <li> - <b>T60 15" XGA</b> - <ul> - <li>Samsung LTN150XG-L08: #</li> - <li>LG-Philips LP150X09: #</li> - <li>13N7068 (IDtech): #</li> - <li>13N7069 (CMO): #</li> - - </ul> - </li> - <li> - <b>T60 15" SXGA+</b> - <ul> - <li>LG-Philips LP150E05-A2K1: #</li> - <li>BOE-Hydis HV150P01-100: #</li> - </ul> - </li> - <li> - <b>T60 15" UXGA</b> - <ul> - <li>BOE-Hydis HV150UX1-100: #</li> - <li>IDTech N150U3-L01: #</li> - <li>BOE-Hydis HV150UX1-102: #</li> - </ul> - </li> - <li> - <b>T50 15" QXGA</b> - <ul> - <li>IDtech IAQX10N: #</li> - <li>IDtech IAQX10S: #</li> - </ul> - </li> - </ul> - - <p><a href="#pagetop">Back to top of page</a></p> - - </div> - - <div class="section"> - - <h1 id="intelvbttool_results">intelvbttool test results (VGA ROM dumps)</h1> - <p> - The VBIOS on i945 (intel gpu) platforms is self-modifying; that is, - its contents change when you run it. intelvbttool takes a dump of - the currently running vbios, and parses it. - </p> - - <p> - The idea is that we can extract the VBT tables using this knowledge, on the X60, X60 Tablet and T60 (Intel GPU). - </p> - - <p> - Here is an example of how VBT was implemented on the ThinkPad X230: - <a href="http://review.coreboot.org/#/c/5396">http://review.coreboot.org/#/c/5396</a>. - </p> - - <p> - You'll need to build a T60 ROM with SeaBIOS and the VGA ROM (for Intel GPU). An X60 ROM is also needed (same configuration, using the VGA ROM for X60). - </p> - - <p> - T60 has DVI on its dock, make sure that the dock is attached when getting this output. - </p> - - <p> - Get intelvbttool here: <a href="http://review.coreboot.org/#/c/5842">http://review.coreboot.org/#/c/5842</a> (util/intelvbttool). - </p> - - <p> - Now dump a copy of the running VGA BIOS: - <b>$ sudo dd if=/dev/mem bs=64k of=runningvga.bin skip=12 count=1</b><br/> - Then do (and record the output):<br/> - <b>$ ./intelvbttool runningvga.bin > intelvbttool_out</b> - </p> - - <p> - Backup both files (runningvga.bin and intelvbttool_out), renaming them to match the system and LCD panel used. - <a href="../misc/#get_edid_panelname">../misc/#get_edid_panelname</a> will show you how to get the name (model) of the LCD panel used. - </p> - - <h2>Test results (# means untested and all had docks, unless noted).</h2> - - <ul> - <li> - <b>X60/X60s:</b> - <ul> - <li>TMD-Toshiba LTD121ECHB: #</li> - <li>CMO N121X5-L06: #</li> - <li>Samsung LTN121XJ-L07: #</li> - <li>BOE-Hydis HT121X01-101: #</li> - </ul> - </li> - <li> - <b>X60T XGA (1024x768):</b> - <ul> - <li>BOE-Hydis HV121X03-100: #</li> - </ul> - </li> - <li> - <b>X60T SXGA+ (1400x1050):</b> - <ul> - <li>BOE-Hydis HV121P01-100: #</li> - </ul> - </li> - <li> - <b>T60 14" XGA (1024x768):</b> - <ul> - <li>Samsung LTN141XA-L01: #</li> - <li>CMO N141XC: #</li> - <li>BOE-Hydis HT14X14: #</li> - <li>TMD-Toshiba LTD141ECMB: #</li> - </ul> - </li> - <li> - <b>T60 14" SXGA+ (1400x1050):</b> - <ul> - <li>TMD-Toshiba LTD141EN9B: #</li> - <li>Samsung LTN141P4-L02: #</li> - <li>Boe-Hydis HT14P12: #</li> - </ul> - </li> - <li> - <b>T60 15" XGA (1024x768):</b> - <ul> - <li>Samsung LTN150XG-L08: #</li> - <li>LG-Philips LP150X09: #</li> - <li>13N7068 (IDtech): #</li> - <li>13N7069 (CMO): #</li> - </ul> - </li> - <li> - <b>T60 15" SXGA+ (1400x1050):</b> - <ul> - <li>LG-Philips LP150E05-A2K1: #</li> - <li>BOE-Hydis HV150P01-100: #</li> - </ul> - </li> - <li> - <b>T60 15" UXGA (1600x1200):</b> - <ul> - <li>BOE-Hydis HV150UX1-100: #</li> - <li>IDTech N150U3-L01: #</li> - <li>BOE-Hydis HV150UX1-102: #</li> - </ul> - </li> - <li> - <b>T60 15" QXGA (2048x1536):</b> - <ul> - <li>IDtech IAQX10N: #</li> - <li>IDtech IAQX10S: #</li> - </ul> - </li> - </ul> - - <p><a href="#pagetop">Back to top of page.</a></p> - - </div> - - <div class="section"> - - <h1 id="fallback_patches">Fallback patches</h1> - - <ul> - <li> - Todo: test gnutoo's fallback patches: <a href="http://www.coreboot.org/Fallback_mechanism">http://www.coreboot.org/Fallback_mechanism</a> - see <a href="gnutoo_fallback_patch">this IRC log</a> (warning, not cleaned up) - </li> - </ul> - - <p><a href="#pagetop">Back to top of page.</a></p> - - </div> - - <div class="section"> - - <h1 id="other">Other - unlisted (low priority)</h1> - - <ul> - <li> - PTE errors still exist on i945 with 6718 (which is merged). <a href="http://review.coreboot.org/#/c/6718/">http://review.coreboot.org/#/c/6718/</a> - <ul> - <li><a href="future/dumps/pte_x60_6718/dmesg">dmesg</a></li> - <li><a href="future/dumps/pte_x60_6718/kern.log">kern.log</a></li> - <li>This doesn't seem to cause any issues for general use.</li> - </ul> - </li> - <li> - Implement INT 10H support in i945 native graphics. (this will be a lot of work. SeaBIOS has code for some geode boards, to get a general idea). - </li> - <li> - T60 15" QXGA (2048x1536): fixed issue where GRUB wouldn't show any graphics. (Not many people have this panel) - <ul> - <li>It might be the same issue I ran into with Paul on the X60 (not enough memory being allocated) since the same code works on T60 SXGA+ and UXGA, where GRUB actually display graphics.</li> - </ul> - </li> - </ul> - - <p><a href="#pagetop">Back to top of page.</a></p> - - </div> - - <div class="section"> - - <p> - Copyright © 2014, 2015 Leah Rowe <info@minifree.org><br/> - Permission is granted to copy, distribute and/or modify this document - under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license - or any later version published by Creative Commons; - - A copy of the license can be found at <a href="../cc-by-sa-4.0.txt">../cc-by-sa-4.0.txt</a> - </p> - - <p> - Updated versions of the license (when available) can be found at - <a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode">https://creativecommons.org/licenses/by-sa/4.0/legalcode</a> - </p> - - <p> - UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE - EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS - AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF - ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, - IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, - WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR - PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS, - ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT - KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT - ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU. - </p> - <p> - TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE - TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, - NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, - INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES, - COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR - USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN - ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR - DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR - IN PART, THIS LIMITATION MAY NOT APPLY TO YOU. - </p> - <p> - The disclaimer of warranties and limitation of liability provided - above shall be interpreted in a manner that, to the extent - possible, most closely approximates an absolute disclaimer and - waiver of all liability. - </p> - - </div> - -</body> -</html> diff --git a/docs/future/index.md b/docs/future/index.md new file mode 100644 index 00000000..23727e11 --- /dev/null +++ b/docs/future/index.md @@ -0,0 +1,465 @@ +<div class="section"> + +Development notes {#pagetop} +================= + +These are development notes, for future use. For old (obselete) notes, +see [old.html](old.html). + +Or go [back to main task list](../tasks.html). + +</div> + +<div class="section"> + +Table of contents +================= + +- [Standard test](#standard_test) +- [T60 cpu microcode](#t60_cpu_microcode) +- [i945 VRAM size](#i945_vram_size) +- [LCD panels on i945 - fix incompatible + panels](#lcd_i945_incompatibility) +- [i945 X60/T60 VBT implementation (experimental: testing)](#i945_vbt) +- [IntelVbtTool results](#intelvbttool_results) +- [Fallback patches for i945](#fallback_patches) + +</div> + +<div class="section"> + +standard test {#standard_test} +============= + +These logs are usually obtained when testing changes related to graphics +on i945 (X60 and T60). + +- Make a copy of these files: + - /var/log/dmesg + - /var/log/kern.log + - /var/log/Xorg.0.log + - /proc/ioports + - /proc/iomem + - /sys/class/drm/card0/error +- Record these outputs: + - sudo intel\_reg\_dumper + - uname -r + - lspci -vvvvnnnnxxxx + - sudo modprobe msr + - sudo inteltool -a + - sudo cbmem -c +- Try some 3D games with latest kernel. + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +T60 cpu microcode {#t60_cpu_microcode} +================= + +TODO: T60: find (for rare buggy CPUs that are unstable without microcode +updates) if there is a workaround (patched kernel, special parameter, +etc) So far, only 1 processor has been found to have issues. See +microcode errata sheets +http://download.intel.com/design/mobile/SPECUPDT/31407918.pdf and +http://download.intel.com/design/mobile/SPECUPDT/30922214.pdf and then +look at the debugging results collected in [t7200q](../t7200q) directory +(q means quirk). + +Every other T7200 tested so far has worked without microcode updates. + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +i945 VRAM size {#i945_vram_size} +============== + +Apparently, only 8MB VRAM is available on i945 GPUs (though it could do +64MB):\ +phcoder: No. Hardware default is 8 MiB. When I wanted to make it +configurable, I saw that docs mention only one other alternative: 1MiB. +Later isn\'t event enough for 1024x768 at 24bpp without any acceleration +or double buffering. It\'s possible that there are undocumented values. +Which options do you have in vendor BIOS? How to find out how much vram +you have:\ +phcoder: TOM - BSM\ +phcoder: check what vendor BIOS offers as options\ +vimuser: I thought it could do 64MB usually\ +phcoder: not accorging to doc.\ +phcoder: see mobile-945-express-chipset-datasheet page 93\ +phcoder: see also +src/northbridge/intel/i945/{early\_init,northbridge,gma}.c\ +vimuser: \"011 = DVMT (UMA) mode, 8 MB of memory pre-allocated for\ +vimuser: frame buffer.\"\ +vimuser: \"Others - reserved\"\ +phcoder: the easiest way is a loop at this position which tries +different values and reads (and prints) BSM with them\ +stefanct: vimuser: they suggest that you change the value and look how +BSM reacts to that\ +stefanct: as they pointed out earlier vram size = TOM - BSM\ +stefanct: different values of GMS\ +stefanct: phcoder: hm\... this could be a hint. look at the text +description of TOLUD at page 103\ +stefanct: it mentions 64 MB in the text about BSM as well\ +stefanct: table 18\...\ +phcoder: stefanct: I have a guess which value make is 64 but I will not +tell to avoid skewing test results\ +stefanct: phcoder: sure\... i assumed you were not sure if it supports +it at all. testing it properly is of course a good idea :)\ +stefanct: test the various possible (but reserved) values of GMS and see +what the resulting VRAM size is\ +vimuser: so, TOM - BSM + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +LCD panels on i945 - fix incompatible panels {#lcd_i945_incompatibility} +============================================ + +Fix T60 issues (see incompatible panels listed at +[../hcl/\#supported\_t60\_list](../hcl/#supported_t60_list)). + +Run that tool (resources/utilities/i945gpu/intel-regs.py) as root on +systems with the offending panels in: + +- Coreboot (or libreboot, whatever) with VBIOS (disable native + graphics also) +- (Factory BIOS also?) + +This shows values in devicetree.cb and src/northbridge/intel/i945/gma.c, +the idea is that you run it on factory bios or vbios and that it will +(might) show different values: then you try those in the native graphics +(in libreboot). + +Other values/registers might also need to be added to the script for +these tests. + +check if intel\_bios\_reader from intel-gpu-tools reports the same value +(BIOS has a hardcoded value) for PWM modulation frequency. This file can +read the VBIOS (64K dump). + +Check other tools in intel-gpu-tools aswell, compare outputs. Possibly +add more information to intel-regs.py output (submit changes to mtjm). +Do oprom trace / replay +(<http://www.coreboot.org/User:GNUtoo#How_to_get_rid_of_the_vbios_of_the_x60_.5BNew_Version.5D>) + +Study how EDID works and how gma.c handles it. + +Original getregs.py script can be found at +<http://hg.mtjm.eu/scripts/file/tip/intel-regs.py> written by Michał +Masłowski. + +About fixing remaining LCD panels on 5345:\ +\'polarity\' is mentioned in coreboot log (cbmem -c). compare output +(with working and non-working panel). (and see the other notes in +docs/future/) + +There was a theory that working panels are 6bpc (bits per colour) and +nonworking are 8bpc, but all EDIDs that we have here are for 6bpc +panels. + +We should compare coreboot logs (from `cbmem -c` from systems with +working and nonworking panels. + +How to dump EDID: + +\# **apt-get install i2c-tools**\ +\# **modprobe i2c-dev**\ +Find out the correct ID to use:\ +\# **i2cdetect -l**\ +Example:\ +\# **i2cdump -y 2 0x50** + +Working panel: EDID dump from LG-Philips LP150E05-A2K1: + + No size specified (using byte-data access) + 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef + 00: XX ff ff ff ff ff ff 00 30 ae 43 40 00 00 00 00 X.......0?C@.... + 10: 00 0f 01 03 80 1e 17 78 ea af 00 99 58 53 8c 2a .??????x??.?XS?* + 20: 25 50 54 21 08 00 81 80 01 01 01 01 01 01 01 01 %PT!?.?????????? + 30: 01 01 01 01 01 01 30 2a 78 20 51 1a 10 40 30 70 ??????0*x Q??@0p + 40: 13 00 31 e4 10 00 00 18 28 23 78 20 51 1a 10 40 ?.1??..?(#x Q??@ + 50: 30 70 13 00 31 e4 10 00 00 18 00 00 00 0f 00 90 0p?.1??..?...?.? + 60: 43 32 90 43 28 14 06 00 32 0c 00 00 00 00 00 fe C2?C(??.2?.....? + 70: 00 4c 50 31 35 30 45 30 35 2d 41 32 0a 20 00 9b .LP150E05-A2? .? + 80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + +Working panel: EDID dump from Boe-Hydis HT14P12-100 FRU: 13N7061 +(Inverter FRU: 41W1010) + + 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef + 00: 00 ff ff ff ff ff ff 00 30 ae 22 40 00 00 00 00 ........0?"@.... + 10: 00 0f 01 03 80 1c 15 78 ea af 40 95 56 4a 8f 25 .??????x??@?VJ?% + 20: 20 50 54 21 08 00 81 80 01 01 01 01 01 01 01 01 PT!?.?????????? + 30: 01 01 01 01 01 01 30 2a 78 20 51 1a 10 40 30 70 ??????0*x Q??@0p + 40: 13 00 1d d6 10 00 00 19 25 23 78 20 51 1a 10 40 ?.???..?%#x Q??@ + 50: 30 70 13 00 1d d6 10 00 00 19 00 00 00 0f 00 90 0p?.???..?...?.? + 60: 43 32 90 43 28 0f 01 00 09 e5 00 00 00 00 00 fe C2?C(??.??.....? + 70: 00 48 54 31 34 50 31 32 2d 31 30 30 0a 20 00 3f .HT14P12-100? .? + 80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + +LTN141XA-L01: revert to libreboot git commit c943281 to see this + +**Non-**working panel: EDID dump from Samsung LTN150XG-L08: + + 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef + 00: 00 ff ff ff ff ff ff 00 30 ae 40 40 00 00 00 00 ........0?@@.... + 10: 00 0f 01 03 80 1f 17 78 ea 2d 05 97 57 51 8a 27 .??????x?-??WQ?' + 20: 23 50 54 21 08 00 01 01 01 01 01 01 01 01 01 01 #PT!?.?????????? + 30: 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88 ??????d?.@A.&0?? + 40: 36 00 30 e4 10 00 00 19 28 15 00 40 41 00 26 30 6.0??..?(?.@A.&0 + 50: 18 88 36 00 30 e4 10 00 00 19 00 00 00 0f 00 61 ??6.0??..?...?.a + 60: 43 32 61 43 28 14 01 00 4c a3 58 47 00 00 00 fe C2aC(??.L?XG...? + 70: 00 4c 54 4e 31 35 30 58 47 2d 4c 30 38 0a 00 6d .LTN150XG-L08?.m + 80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................ + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +i945 gfx: X60/T60 VBT implementation (experimental: testing) {#i945_vbt} +============================================================ + +intel\_bios\_dumper in intel-gpu-tools seems interesting. + +**Use \'drm.debug=0x06\' kernel parameter when booting in grub!** + +Before each test run, boot a live USB and delete the old logs in +/var/log (kernel log, xorg log, dmesg and so on). + +Load (from the ROM) the runningvga.bin for each LCD panel on each +system; do not execute it, only load it! (coreboot will have to be +modified). Rename the ROM appropriately, based on the system name and +the panel name. +coreboot\_nativegfx\_5868\_plusrunningvga\_t60\_14\_LTD141ECMB.rom, for +instance. Keep a copy for later use. + +You are supposed to: + +- enable native graphics in menuconfig +- include the self-modified VGA ROM (load, but not execute) - for + reverse engineering the correct VBT tables. + +With each boot, make notes about what you see and get logs using the +[standard test](#standard_test). You will need the files from +[\#intelvbttool\_results](#intelvbttool_results) for each system. + +Results (\# means untested): +- **X60/X60s:** + - TMD-Toshiba LTD121ECHB: \# + - CMO N121X5-L06: \# + - Samsung LTN121XJ-L07: \# + - BOE-Hydis HT121X01-101: \# +- **X60T XGA:** + - BOE-Hydis HV121X03-100: \# +- **X60T SXGA+:** + - BOE-Hydis HV121P01-100: \# +- **T60 14\" XGA:** + - Samsung LTN141XA-L01: \# + - CMO N141XC: \# + - BOE-Hydis HT14X14: \# + - TMD-Toshiba LTD141ECMB: \# +- **T60 14\" SXGA+** + - TMD-Toshiba LTD141EN9B: \# + - Samsung LTN141P4-L02: \# + - Boe-Hydis HT14P12: \# +- **T60 15\" XGA** + - Samsung LTN150XG-L08: \# + - LG-Philips LP150X09: \# + - 13N7068 (IDtech): \# + - 13N7069 (CMO): \# +- **T60 15\" SXGA+** + - LG-Philips LP150E05-A2K1: \# + - BOE-Hydis HV150P01-100: \# +- **T60 15\" UXGA** + - BOE-Hydis HV150UX1-100: \# + - IDTech N150U3-L01: \# + - BOE-Hydis HV150UX1-102: \# +- **T50 15\" QXGA** + - IDtech IAQX10N: \# + - IDtech IAQX10S: \# + +[Back to top of page](#pagetop) + +</div> + +<div class="section"> + +intelvbttool test results (VGA ROM dumps) {#intelvbttool_results} +========================================= + +The VBIOS on i945 (intel gpu) platforms is self-modifying; that is, its +contents change when you run it. intelvbttool takes a dump of the +currently running vbios, and parses it. + +The idea is that we can extract the VBT tables using this knowledge, on +the X60, X60 Tablet and T60 (Intel GPU). + +Here is an example of how VBT was implemented on the ThinkPad X230: +<http://review.coreboot.org/#/c/5396>. + +You\'ll need to build a T60 ROM with SeaBIOS and the VGA ROM (for Intel +GPU). An X60 ROM is also needed (same configuration, using the VGA ROM +for X60). + +T60 has DVI on its dock, make sure that the dock is attached when +getting this output. + +Get intelvbttool here: <http://review.coreboot.org/#/c/5842> +(util/intelvbttool). + +Now dump a copy of the running VGA BIOS: **\$ sudo dd if=/dev/mem bs=64k +of=runningvga.bin skip=12 count=1**\ +Then do (and record the output):\ +**\$ ./intelvbttool runningvga.bin > intelvbttool\_out** + +Backup both files (runningvga.bin and intelvbttool\_out), renaming them +to match the system and LCD panel used. +[../misc/\#get\_edid\_panelname](../misc/#get_edid_panelname) will show +you how to get the name (model) of the LCD panel used. + +Test results (\# means untested and all had docks, unless noted). +----------------------------------------------------------------- + +- **X60/X60s:** + - TMD-Toshiba LTD121ECHB: \# + - CMO N121X5-L06: \# + - Samsung LTN121XJ-L07: \# + - BOE-Hydis HT121X01-101: \# +- **X60T XGA (1024x768):** + - BOE-Hydis HV121X03-100: \# +- **X60T SXGA+ (1400x1050):** + - BOE-Hydis HV121P01-100: \# +- **T60 14\" XGA (1024x768):** + - Samsung LTN141XA-L01: \# + - CMO N141XC: \# + - BOE-Hydis HT14X14: \# + - TMD-Toshiba LTD141ECMB: \# +- **T60 14\" SXGA+ (1400x1050):** + - TMD-Toshiba LTD141EN9B: \# + - Samsung LTN141P4-L02: \# + - Boe-Hydis HT14P12: \# +- **T60 15\" XGA (1024x768):** + - Samsung LTN150XG-L08: \# + - LG-Philips LP150X09: \# + - 13N7068 (IDtech): \# + - 13N7069 (CMO): \# +- **T60 15\" SXGA+ (1400x1050):** + - LG-Philips LP150E05-A2K1: \# + - BOE-Hydis HV150P01-100: \# +- **T60 15\" UXGA (1600x1200):** + - BOE-Hydis HV150UX1-100: \# + - IDTech N150U3-L01: \# + - BOE-Hydis HV150UX1-102: \# +- **T60 15\" QXGA (2048x1536):** + - IDtech IAQX10N: \# + - IDtech IAQX10S: \# + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +Fallback patches {#fallback_patches} +================ + +- Todo: test gnutoo\'s fallback patches: + <http://www.coreboot.org/Fallback_mechanism> see [this IRC + log](gnutoo_fallback_patch) (warning, not cleaned up) + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +Other - unlisted (low priority) {#other} +=============================== + +- PTE errors still exist on i945 with 6718 (which is merged). + <http://review.coreboot.org/#/c/6718/> + - [dmesg](future/dumps/pte_x60_6718/dmesg) + - [kern.log](future/dumps/pte_x60_6718/kern.log) + - This doesn\'t seem to cause any issues for general use. +- Implement INT 10H support in i945 native graphics. (this will be a + lot of work. SeaBIOS has code for some geode boards, to get a + general idea). +- T60 15\" QXGA (2048x1536): fixed issue where GRUB wouldn\'t show any + graphics. (Not many people have this panel) + - It might be the same issue I ran into with Paul on the X60 (not + enough memory being allocated) since the same code works on T60 + SXGA+ and UXGA, where GRUB actually display graphics. + +[Back to top of page.](#pagetop) + +</div> + +<div class="section"> + +Copyright © 2014, 2015 Leah Rowe <info@minifree.org>\ +Permission is granted to copy, distribute and/or modify this document +under the terms of the Creative Commons Attribution-ShareAlike 4.0 +International license or any later version published by Creative +Commons; A copy of the license can be found at +[../cc-by-sa-4.0.txt](../cc-by-sa-4.0.txt) + +Updated versions of the license (when available) can be found at +<https://creativecommons.org/licenses/by-sa/4.0/legalcode> + +UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE EXTENT +POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS AND +AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND +CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, IMPLIED, STATUTORY, +OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, WARRANTIES OF TITLE, +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, +ABSENCE OF LATENT OR OTHER DEFECTS, ACCURACY, OR THE PRESENCE OR ABSENCE +OF ERRORS, WHETHER OR NOT KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF +WARRANTIES ARE NOT ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT +APPLY TO YOU. + +TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE TO YOU +ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE) OR +OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL, +PUNITIVE, EXEMPLARY, OR OTHER LOSSES, COSTS, EXPENSES, OR DAMAGES +ARISING OUT OF THIS PUBLIC LICENSE OR USE OF THE LICENSED MATERIAL, EVEN +IF THE LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSSES, +COSTS, EXPENSES, OR DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT +ALLOWED IN FULL OR IN PART, THIS LIMITATION MAY NOT APPLY TO YOU. + +The disclaimer of warranties and limitation of liability provided above +shall be interpreted in a manner that, to the extent possible, most +closely approximates an absolute disclaimer and waiver of all liability. + +</div> diff --git a/docs/future/old.html b/docs/future/old.html deleted file mode 100644 index fe0c0910..00000000 --- a/docs/future/old.html +++ /dev/null @@ -1,319 +0,0 @@ -<!DOCTYPE html> -<html lang="en"> -<head> - <meta charset="utf-8"> - <title>libreboot tutorials</title> - - <style type="text/css"> - @import url('../css/main.css'); - </style> - - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - <meta name="author" content="glugman"> - <meta name="description" content="tutorials for libreboot, the reboot library."> - <meta name="robots" content="all"> -</head> - -<body> - - <div class="section"> - - <h1 id="pagetop">Development notes (old/obsolete notes)</h1> - <p> - For current notes, see <a href="./"></a>. - </p> - - <p> - These are old (obsolete) notes that mare kept because they might become useful again in the future. - </p> - - </div> - - <div class="section"> - - <h1>Table of contents</h1> - <ul> - <li><a href="#x60_native_notes">X60 native graphics initialization (backlight controls)</a></li> - <li><a href="#t60_native_notes">T60 native graphics initialization (backlight controls)</a></li> - <li><a href="#5320_kernel312fix">i945: 3D fix (based on 5927) for kernel 3.12+ on 5320</a></li> - <li><a href="#x60_cb5927_testing">i945/x60: coreboot 5927 testing (3D fix for kernel 3.12+ on replay code)</a></li> - </ul> - - </div> - - <div class="section"> - - <h1 id="x60_native_notes">X60 native graphics initialization (with backlight controls)</h1> - - <p> - <b> - This is now obsolete. A better way was found (included in libreboot): <a href="http://review.coreboot.org/#/c/6731/">http://review.coreboot.org/#/c/6731/</a> - </b> - </p> - - <p> - <b><i>Also check <a href="#5320_kernel312fix">#5320_kernel312fix</a> (to fix 3D on kernel 3.12/higher)</i></b> - </p> - <p> - <b>The fix below was done on 5320/6 (from review.coreboot.org) but should work just fine on later versions of 5320.</b> - </p> - <p> - Native gpu init + backlight controls! (Fn keys). Also confirmed on X60 Tablet (1024x768) and X60 Tablet (1400x1050) - </p> - <p> - <b>Add backlight controls:</b> in <i>src/mainboard/lenovo/x60/devicetree.cb</i>, change <b>gpu_backlight</b> to <b>0x879F879E</b> - </p> - <p> - That's all! <b>This has also been backported into libreboot 5th release (line 1233 in src/mainboard/lenovo/x60/i915io.c)</b>. GNUtoo (Denis Carikli) - told me about the register <b>BLC_PWM_CTL</b> and that you could set it to control backlight. I read that address using devmem2 while running the VBIOS:<br/> - <b># devmem2 0xe4361254 w</b> - </p> - <p> - The change is also included in libreboot 6. - </p> - <p> - When doing this, it gave back that value. The same trick was used to get backlight controls for T60 (see <a href="#t60_native_notes">#t60_native_notes</a>). - </p> - - <h2>Further notes</h2> - <p> - Reading <b>0xe4361254</b> (address) in Lenovo BIOS always yields FFFFFFFF, even when writing to it (and writing to it doesn't affect brightness controls). - 'mtjm' on IRC found that the buttons (Fn keys) control /sys/class/backlight/acpi_video0 which has no affect on 61254 (BLC_PWM_CTL). This person says - intel_backlight has different values and uses the register. devmem2 works, needs checking <b>lspci -vv</b> for where the memory is mapped, - which is different than on coreboot; mtjm found that it was 0xec061254 on his system (X60 Tablet), and the register value is different too. - <b>This is relevant, because we still don't know how backlight controls are actually handled. We got it working by accident. We need to know more.</b>. - </p> - <p> - Intel-gpu-tools may prove useful for further debugging: <a href="http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/">http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/</a> - </p> - <p> - mtjm says 0xe4300000 is an MMIO region of the gpu (lspci -vv shows it), 0x61254 (BLC_PWM_CTL) is a documented register. Searching the kernel driver for backlight - shows that in intel_panel.c this register is used (there is an XXX comment about finding the right value, where recent kernels get it from. - </p> - <p> - What we want to do is calculate a good value, instead of setting it in devicetree.cb. mtjm says about backlight physics: - it has a light source , uses pulse width modulation (PWM) to turn it on/off, dimming is done by spending less time on. - <b>Note: this may not be correct; this person says that their understanding is based on how the Lenote yeeloong works</b>. - </p> - <p> - mtjm goes on to say, that the register specifies the frequency used for PWM in its depending on the GPU core frequency, so it - might be possible to calculate it without hardcoded laptop-specific values. Therefore, I am supposed to find out the 'display core frequency' - (mtjm says there might be a register for it; also, it might be in 5320 or the replay code) and the PWM modulation frequency. - https://en.wikipedia.org/wiki/Backlight#Flicker_due_to_backlight_dimming - </p> - <p> - phcoder (Vladimir Serbinenko) who is author of 5320 (review.coreboot.org) talks about 'duty cycle limit' and 'flickering frequency'. - </p> - - <p><a href="#pagetop">Back to top of page</a></p> - - </div> - - <div class="section"> - - <h1 id="t60_native_notes">T60 native graphics initialization (with backlight controls)</h1> - - <p> - <b> - This is now obsolete. A better way was found (included in libreboot): <a href="http://review.coreboot.org/#/c/6731/">http://review.coreboot.org/#/c/6731/</a> - </b> - </p> - <p> - <b><i>Also check <a href="#5320_kernel312fix">#5320_kernel312fix</a> (to fix 3D on kernel 3.12/higher)</i></b> - </p> - <p> - <b>The fix below was done on an earlier version of 5345 changeset (review.coreboot.org), but should work on the current version. it is included in libreboot 6</b> - </p> - <p> - <b>Add backlight controls:</b> in <i>src/mainboard/lenovo/t60/devicetree.cb</i>, change <b>gpu_backlight</b> to <b>0x58BF58BE</b> - </p> - <p> - Hold on! Check <a href="../misc/#get_edid_panelname">../misc/#get_edid_panelname</a> to know what LCD panel you have. This is important for the next step! - </p> - - <h2>Supported panels</h2> - <p> - <a href="../hcl/#supported_t60_list">../hcl/#supported_t60_list</a>. - </p> - - <p> - See <a href="./#lcd_i945_incompatibility">#lcd_i945_incompatibility</a>. - </p> - - <p><a href="#pagetop">Back to top of page</a></p> - - </div> - - <div class="section"> - - <h1 id="5320_kernel312fix">i945: 3D fix (based on 5927) for kernel 3.12+ on 5320</h1> - - <p> - <b> - This is now obsolete. Merged in coreboot: <a href="http://review.coreboot.org/#/c/5927/">http://review.coreboot.org/#/c/5927/</a> - </b> - </p> - - <p><b>This needs to be rewritten (or better organized, or deleted?)</b>. This is also now included in libreboot 6 (using the proper way, not the 7c0000 method which was a hack)</p> - - <p> - <b>This was done on 5320/6 so far. The fix below is for 5320/6 which is now obsolete. This needs to be re-done for the latest version - of 5320. The fix below is (in practise) only for reference, therefore.</b> - </p> - - <p> - See <a href="#x60_cb5927_testing">#x60_cb5927_testing</a> for the original (and current) fix, for the replay code. Now we want - to implement that on top of <a href="http://review.coreboot.org/#/c/5320">http://review.coreboot.org/#/c/5320</a> - which is the current code for native graphics initialization on i945. - </p> - - <p> - src/northbridge/intel/i945/gma.c (using the 7c0000 hack) on 5320: <a href="dumps/5320_7c0000_gma.c">5320_7c0000_gma.c</a> (rename it to gma.c, - replacing the current one). - </p> - - <p> - The above is a hack (as is the original). A better (more correct) method is implemented in later versions of 5927, so - that should also be adapted for 5320. For now, you can use the above fix. - </p> - - <p> - The correct way to do it is to set gtt address to (end of stolen memory - gtt size), which is what later versions of 5927 do (successfully). - </p> - - <p> - Here is some debugging output using intel_gpu_tools v1.2-1 (from apt-get repositories) using tool "intel_gtt": - </p> - - <ul> - <li> - kernel 3.14.4: - <ul> - <li>with libreboot 5th release (using the 7c0000 gtt hack from 5927/3): <a href="http://paste.debian.net/104306">http://paste.debian.net/104306</a></li> - <li>with coreboot+vgarom: <a href="http://paste.debian.net/104309">http://paste.debian.net/104309</a></li> - </ul> - </li> - <li> - kernel 3.2.0-60 (from apt-get repositories): - <ul> - <li>with coreboot (no vbios or native init): <a href="http://paste.debian.net/104341">http://paste.debian.net/104341</a></li> - </ul> - </li> - </ul> - - <p><a href="#pagetop">Back to top of page</a></p> - - </div> - - <div class="section"> - - <h1 id="x60_cb5927_testing">i945/X60: Coreboot 5927 testing (3D fix for kernel 3.12+ on replay code)</h1> - - <p> - <b> - This is now obsolete. Merged in coreboot: <a href="http://review.coreboot.org/#/c/5927/">http://review.coreboot.org/#/c/5927/</a> - </b> - </p> - - <p><b>The latest version as-is (5927/11) has not been tested by me yet. Always boot with 'drm.debug=0x06' kernel parameter when testing this.</b></p> - - <p> - This is the fix for 3D on kernel 3.12 and higher on i945 (ThinkPad X60 in this case). This is for the replay code. - Libreboot 5th release has a version of this backported already (based on 5927/3 using the '7c0000' hack). - </p> - - <p> - <b> - The replay code is obsolete (see 5320 changeset on review.coreboot.org for better version - which supports more systems/screens, and then 5345 for T60). Information here for reference since that is where the fix was first applied. - </b> - </p> - - <p> - Read the information on <a href="http://review.coreboot.org/#/c/5927/">http://review.coreboot.org/#/c/5927/</a>. - </p> - - <p> - For historical purposes, here is a collection of IRC logs that once existed on this page, related to the issue: - <a href="dumps/kernel312_irc">kernel312_irc</a>. - </p> - - <p> - PGETBL_CTL differs between VBIOS (-) and native graphics init (+).<br/> - - - PGETBL_CTL: 0x3ffc0001<br/> - + PGETBL_CTL: 0x3f800001 - </p> - - <p>GTT (graphics translation table) size is PGETBL_save, max 256 KiB. BSM (Base of Stolen Memory) is given by the bios.</p> - - <ul> - <li>5927/7: <a href="dumps/5927_7.tar.gz">5927_7.tar.gz</a> (GRUB graphics are correct now, and 3D still works)</li> - <li>5927/6: <a href="dumps/5927_6.tar.gz">5927_6.tar.gz</a> (GRUB graphics still corrupt, 3D/everything still works after GRUB)</li> - <li>5927/5: <a href="dumps/5927_5.tar.gz">5927_5.tar.gz</a> (GRUB graphics corrupt, 3D/everything still works after GRUB)</li> - <li>5927/3: <a href="dumps/5927_3.tar.gz">5927_3.tar.gz</a> (3D still works! kernel 3.14.4) - the '7c0000' hack</li> - <li>5927/2: <a href="dumps/5927_2.tar.gz">5927_2.tar.gz</a> (3D works! kernel 3.14.4) - the '7c0000' hack</li> - <li> - 5927/1 (didn't fix the 3D issue): - <ul> - <li><a href="dumps/5927_cbmemc">cbmem -c</a></li> - <li><a href="dumps/5927_crashdump">/sys/class/drm/card0/error</a></li> - <li><a href="dumps/5927_config">.config</a></li> - </ul> - </li> - </ul> - - <p><a href="#pagetop">Back to top of page</a></p> - - </div> - - <div class="section"> - - <p> - Copyright © 2014, 2015 Leah Rowe <info@minifree.org><br/> - Permission is granted to copy, distribute and/or modify this document - under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license - or any later version published by Creative Commons; - - A copy of the license can be found at <a href="../cc-by-sa-4.0.txt">../cc-by-sa-4.0.txt</a> - </p> - - <p> - Updated versions of the license (when available) can be found at - <a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode">https://creativecommons.org/licenses/by-sa/4.0/legalcode</a> - </p> - - <p> - UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE - EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS - AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF - ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, - IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, - WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR - PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS, - ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT - KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT - ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU. - </p> - <p> - TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE - TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, - NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, - INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES, - COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR - USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN - ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR - DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR - IN PART, THIS LIMITATION MAY NOT APPLY TO YOU. - </p> - <p> - The disclaimer of warranties and limitation of liability provided - above shall be interpreted in a manner that, to the extent - possible, most closely approximates an absolute disclaimer and - waiver of all liability. - </p> - - </div> - -</body> -</html> diff --git a/docs/future/old.md b/docs/future/old.md new file mode 100644 index 00000000..88c6cc1b --- /dev/null +++ b/docs/future/old.md @@ -0,0 +1,279 @@ +<div class="section"> + +Development notes (old/obsolete notes) {#pagetop} +====================================== + +For current notes, see [](./). + +These are old (obsolete) notes that mare kept because they might become +useful again in the future. + +</div> + +<div class="section"> + +Table of contents +================= + +- [X60 native graphics initialization (backlight + controls)](#x60_native_notes) +- [T60 native graphics initialization (backlight + controls)](#t60_native_notes) +- [i945: 3D fix (based on 5927) for kernel 3.12+ on + 5320](#5320_kernel312fix) +- [i945/x60: coreboot 5927 testing (3D fix for kernel 3.12+ on replay + code)](#x60_cb5927_testing) + +</div> + +<div class="section"> + +X60 native graphics initialization (with backlight controls) {#x60_native_notes} +============================================================ + +**This is now obsolete. A better way was found (included in libreboot): +<http://review.coreboot.org/#/c/6731/>** + +***Also check [\#5320\_kernel312fix](#5320_kernel312fix) (to fix 3D on +kernel 3.12/higher)*** + +**The fix below was done on 5320/6 (from review.coreboot.org) but should +work just fine on later versions of 5320.** + +Native gpu init + backlight controls! (Fn keys). Also confirmed on X60 +Tablet (1024x768) and X60 Tablet (1400x1050) + +**Add backlight controls:** in *src/mainboard/lenovo/x60/devicetree.cb*, +change **gpu\_backlight** to **0x879F879E** + +That\'s all! **This has also been backported into libreboot 5th release +(line 1233 in src/mainboard/lenovo/x60/i915io.c)**. GNUtoo (Denis +Carikli) told me about the register **BLC\_PWM\_CTL** and that you could +set it to control backlight. I read that address using devmem2 while +running the VBIOS:\ +**\# devmem2 0xe4361254 w** + +The change is also included in libreboot 6. + +When doing this, it gave back that value. The same trick was used to get +backlight controls for T60 (see +[\#t60\_native\_notes](#t60_native_notes)). + +Further notes +------------- + +Reading **0xe4361254** (address) in Lenovo BIOS always yields FFFFFFFF, +even when writing to it (and writing to it doesn\'t affect brightness +controls). \'mtjm\' on IRC found that the buttons (Fn keys) control +/sys/class/backlight/acpi\_video0 which has no affect on 61254 +(BLC\_PWM\_CTL). This person says intel\_backlight has different values +and uses the register. devmem2 works, needs checking **lspci -vv** for +where the memory is mapped, which is different than on coreboot; mtjm +found that it was 0xec061254 on his system (X60 Tablet), and the +register value is different too. **This is relevant, because we still +don\'t know how backlight controls are actually handled. We got it +working by accident. We need to know more.**. + +Intel-gpu-tools may prove useful for further debugging: +<http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/> + +mtjm says 0xe4300000 is an MMIO region of the gpu (lspci -vv shows it), +0x61254 (BLC\_PWM\_CTL) is a documented register. Searching the kernel +driver for backlight shows that in intel\_panel.c this register is used +(there is an XXX comment about finding the right value, where recent +kernels get it from. + +What we want to do is calculate a good value, instead of setting it in +devicetree.cb. mtjm says about backlight physics: it has a light source +, uses pulse width modulation (PWM) to turn it on/off, dimming is done +by spending less time on. **Note: this may not be correct; this person +says that their understanding is based on how the Lenote yeeloong +works**. + +mtjm goes on to say, that the register specifies the frequency used for +PWM in its depending on the GPU core frequency, so it might be possible +to calculate it without hardcoded laptop-specific values. Therefore, I +am supposed to find out the \'display core frequency\' (mtjm says there +might be a register for it; also, it might be in 5320 or the replay +code) and the PWM modulation frequency. +https://en.wikipedia.org/wiki/Backlight\#Flicker\_due\_to\_backlight\_dimming + +phcoder (Vladimir Serbinenko) who is author of 5320 +(review.coreboot.org) talks about \'duty cycle limit\' and \'flickering +frequency\'. + +[Back to top of page](#pagetop) + +</div> + +<div class="section"> + +T60 native graphics initialization (with backlight controls) {#t60_native_notes} +============================================================ + +**This is now obsolete. A better way was found (included in libreboot): +<http://review.coreboot.org/#/c/6731/>** + +***Also check [\#5320\_kernel312fix](#5320_kernel312fix) (to fix 3D on +kernel 3.12/higher)*** + +**The fix below was done on an earlier version of 5345 changeset +(review.coreboot.org), but should work on the current version. it is +included in libreboot 6** + +**Add backlight controls:** in *src/mainboard/lenovo/t60/devicetree.cb*, +change **gpu\_backlight** to **0x58BF58BE** + +Hold on! Check +[../misc/\#get\_edid\_panelname](../misc/#get_edid_panelname) to know +what LCD panel you have. This is important for the next step! + +Supported panels +---------------- + +[../hcl/\#supported\_t60\_list](../hcl/#supported_t60_list). + +See [\#lcd\_i945\_incompatibility](./#lcd_i945_incompatibility). + +[Back to top of page](#pagetop) + +</div> + +<div class="section"> + +i945: 3D fix (based on 5927) for kernel 3.12+ on 5320 {#5320_kernel312fix} +===================================================== + +**This is now obsolete. Merged in coreboot: +<http://review.coreboot.org/#/c/5927/>** + +**This needs to be rewritten (or better organized, or deleted?)**. This +is also now included in libreboot 6 (using the proper way, not the +7c0000 method which was a hack) + +**This was done on 5320/6 so far. The fix below is for 5320/6 which is +now obsolete. This needs to be re-done for the latest version of 5320. +The fix below is (in practise) only for reference, therefore.** + +See [\#x60\_cb5927\_testing](#x60_cb5927_testing) for the original (and +current) fix, for the replay code. Now we want to implement that on top +of <http://review.coreboot.org/#/c/5320> which is the current code for +native graphics initialization on i945. + +src/northbridge/intel/i945/gma.c (using the 7c0000 hack) on 5320: +[5320\_7c0000\_gma.c](dumps/5320_7c0000_gma.c) (rename it to gma.c, +replacing the current one). + +The above is a hack (as is the original). A better (more correct) method +is implemented in later versions of 5927, so that should also be adapted +for 5320. For now, you can use the above fix. + +The correct way to do it is to set gtt address to (end of stolen memory +- gtt size), which is what later versions of 5927 do (successfully). + +Here is some debugging output using intel\_gpu\_tools v1.2-1 (from +apt-get repositories) using tool \"intel\_gtt\": + +- kernel 3.14.4: + - with libreboot 5th release (using the 7c0000 gtt hack from + 5927/3): <http://paste.debian.net/104306> + - with coreboot+vgarom: <http://paste.debian.net/104309> +- kernel 3.2.0-60 (from apt-get repositories): + - with coreboot (no vbios or native init): + <http://paste.debian.net/104341> + +[Back to top of page](#pagetop) + +</div> + +<div class="section"> + +i945/X60: Coreboot 5927 testing (3D fix for kernel 3.12+ on replay code) {#x60_cb5927_testing} +======================================================================== + +**This is now obsolete. Merged in coreboot: +<http://review.coreboot.org/#/c/5927/>** + +**The latest version as-is (5927/11) has not been tested by me yet. +Always boot with \'drm.debug=0x06\' kernel parameter when testing +this.** + +This is the fix for 3D on kernel 3.12 and higher on i945 (ThinkPad X60 +in this case). This is for the replay code. Libreboot 5th release has a +version of this backported already (based on 5927/3 using the \'7c0000\' +hack). + +**The replay code is obsolete (see 5320 changeset on review.coreboot.org +for better version which supports more systems/screens, and then 5345 +for T60). Information here for reference since that is where the fix was +first applied.** + +Read the information on <http://review.coreboot.org/#/c/5927/>. + +For historical purposes, here is a collection of IRC logs that once +existed on this page, related to the issue: +[kernel312\_irc](dumps/kernel312_irc). + +PGETBL\_CTL differs between VBIOS (-) and native graphics init (+).\ +- PGETBL\_CTL: 0x3ffc0001\ ++ PGETBL\_CTL: 0x3f800001 + +GTT (graphics translation table) size is PGETBL\_save, max 256 KiB. BSM +(Base of Stolen Memory) is given by the bios. + +- 5927/7: [5927\_7.tar.gz](dumps/5927_7.tar.gz) (GRUB graphics are + correct now, and 3D still works) +- 5927/6: [5927\_6.tar.gz](dumps/5927_6.tar.gz) (GRUB graphics still + corrupt, 3D/everything still works after GRUB) +- 5927/5: [5927\_5.tar.gz](dumps/5927_5.tar.gz) (GRUB graphics + corrupt, 3D/everything still works after GRUB) +- 5927/3: [5927\_3.tar.gz](dumps/5927_3.tar.gz) (3D still works! + kernel 3.14.4) - the \'7c0000\' hack +- 5927/2: [5927\_2.tar.gz](dumps/5927_2.tar.gz) (3D works! kernel + 3.14.4) - the \'7c0000\' hack +- 5927/1 (didn\'t fix the 3D issue): + - [cbmem -c](dumps/5927_cbmemc) + - [/sys/class/drm/card0/error](dumps/5927_crashdump) + - [.config](dumps/5927_config) + +[Back to top of page](#pagetop) + +</div> + +<div class="section"> + +Copyright © 2014, 2015 Leah Rowe <info@minifree.org>\ +Permission is granted to copy, distribute and/or modify this document +under the terms of the Creative Commons Attribution-ShareAlike 4.0 +International license or any later version published by Creative +Commons; A copy of the license can be found at +[../cc-by-sa-4.0.txt](../cc-by-sa-4.0.txt) + +Updated versions of the license (when available) can be found at +<https://creativecommons.org/licenses/by-sa/4.0/legalcode> + +UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE EXTENT +POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS AND +AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND +CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, IMPLIED, STATUTORY, +OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, WARRANTIES OF TITLE, +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, +ABSENCE OF LATENT OR OTHER DEFECTS, ACCURACY, OR THE PRESENCE OR ABSENCE +OF ERRORS, WHETHER OR NOT KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF +WARRANTIES ARE NOT ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT +APPLY TO YOU. + +TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE TO YOU +ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE) OR +OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL, +PUNITIVE, EXEMPLARY, OR OTHER LOSSES, COSTS, EXPENSES, OR DAMAGES +ARISING OUT OF THIS PUBLIC LICENSE OR USE OF THE LICENSED MATERIAL, EVEN +IF THE LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSSES, +COSTS, EXPENSES, OR DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT +ALLOWED IN FULL OR IN PART, THIS LIMITATION MAY NOT APPLY TO YOU. + +The disclaimer of warranties and limitation of liability provided above +shall be interpreted in a manner that, to the extent possible, most +closely approximates an absolute disclaimer and waiver of all liability. + +</div> |