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-% Development notes 
-
-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).
-
-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)
-
-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.
-
-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.
-
-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
-
-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    ................
-
-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)
-
-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: \#
-
-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)
-
-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.
-
-Copyright © 2014, 2015 Leah Rowe <info@minifree.org>\
-This page is available under the [CC BY SA 4.0](../cc-by-sa-4.0.txt)