convert documentation to texinfo

author: Francis Rowe <info@gluglug.org.uk> 2015-11-06 22:43:29 +0000
committer: Francis Rowe <info@gluglug.org.uk> 2015-11-07 04:45:09 +0000
commit: 95259e28ef047923258434898113d70c8e544eab (patch)
tree: 1c0501bf4c7df1c31948184dabfc1e7c4c215a6e /docs/future/old.html
parent: 707f9383a8189b0054730134340f20709f56f976 (diff)
download: librebootfr-95259e28ef047923258434898113d70c8e544eab.tar.gz
librebootfr-95259e28ef047923258434898113d70c8e544eab.zip
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-<!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="index.html">index.html</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/index.html#get_edid_panelname">../misc/index.html#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/index.html#supported_t60_list">../hcl/index.html#supported_t60_list</a>.
-				</p>
-
-			<p>
-				See <a href="index.html#lcd_i945_incompatibility">index.html#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 trisquel repositories) using tool "intel_gtt":
-			</p>
-
-			<ul>
-				<li>
-					Trisquel 6. 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>
-					Trisquel 6. kernel 3.2.0-60 (from Trisquel 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 &copy;  2014, 2015 Francis Rowe &lt;info@gluglug.org.uk&gt;<br/>
-			Permission is granted to copy, distribute and/or modify this document
-			under the terms of the GNU Free Documentation License, Version 1.3
-			or any later version published by the Free Software Foundation;
-			with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
-			A copy of the license can be found at <a href="../gfdl-1.3.txt">../gfdl-1.3.txt</a>
-		</p>
-
-		<p>
-			Updated versions of the license (when available) can be found at
-			<a href="https://www.gnu.org/licenses/licenses.html">https://www.gnu.org/licenses/licenses.html</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>
author	Francis Rowe <info@gluglug.org.uk>	2015-11-06 22:43:29 +0000
committer	Francis Rowe <info@gluglug.org.uk>	2015-11-07 04:45:09 +0000
commit	95259e28ef047923258434898113d70c8e544eab (patch)
tree	1c0501bf4c7df1c31948184dabfc1e7c4c215a6e /docs/future/old.html
parent	707f9383a8189b0054730134340f20709f56f976 (diff)
download	librebootfr-95259e28ef047923258434898113d70c8e544eab.tar.gz librebootfr-95259e28ef047923258434898113d70c8e544eab.zip