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| author | Francis Rowe <info@gluglug.org.uk> | 2014-10-13 21:31:47 (EDT) |
|---|---|---|
| committer | Francis Rowe <info@gluglug.org.uk> | 2014-10-13 21:31:47 (EDT) |
| commit | 1577195ca8899df42dfce30e5d3c72345ea17e93 (patch) | |
| tree | 8f4e8e8139f06ef9203a60428d5cfdab73ffca64 /docs/future/index.html | |
| parent | 2b6487ad035cfad611bb7801b6c51680d8c5c5e8 (diff) | |
| download | libreboot-1577195ca8899df42dfce30e5d3c72345ea17e93.zip libreboot-1577195ca8899df42dfce30e5d3c72345ea17e93.tar.gz libreboot-1577195ca8899df42dfce30e5d3c72345ea17e93.tar.bz2 | |
Documentation: major cleanup.
Diffstat (limited to 'docs/future/index.html')
| -rw-r--r-- | docs/future/index.html | 407 |
1 files changed, 118 insertions, 289 deletions
diff --git a/docs/future/index.html b/docs/future/index.html index 0bdabf4..52f1ec8 100644 --- a/docs/future/index.html +++ b/docs/future/index.html @@ -35,16 +35,12 @@ <h2>Contents</h2> <ul> - <li><a href="#todo">TODO list</a></li> <li><a href="#standard_test">Standard test</a></li> <li><a href="#t60_cpu_microcode">T60 cpu microcode</a></li> - <li><a href="#fastboot">Fast boot</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="#blind_x60">Blind X60 - kernel git bisect</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="#cpu_cstates_buzzing">CPU c-states (X60/T60) buzzing sound on CPU idle</a></li> - <li><a href="#battery_eventc">Battery 'event c' on X60 (and T60?)</a></li> </ul> <hr/> @@ -99,89 +95,37 @@ <hr/> - <h1 id="fastboot">Fast boot</h1> - - <p> - Based on information supplied by Charles Devereaux. Look into this. The following are the files - that he gave me, and what he said: - </p> - - <ul> - <li><a href="fastboot/x60.config">x60.config</a></li> - <li><a href="fastboot/get-systemd.sh">get-systemd.sh</a></li> - <li><a href="fastboot/grub.cfg.memdisk">grub.cfg.memdisk</a></li> - <li><a href="fastboot/grub.cfg">grub.cfg</a></li> - </ul> - - <p> - failsafes to allow people to experiment with few risks.The memdisk tries to load a grub.cfg from each partition, - failing that from the CBFS, and failing that prepares the serial port and - shows a simple menu reminding the user that this is the memdisk (beeps are - also played) and some simple options (ex: call directly a linux kernel). - </p> - - <p> - The grub.cfg from the CBFS tries to load a working grub.cfg from a - thumbdrive, and failing that shows a menu offering to boot on seabios (for - CD boot) + <h1 id="i945_vram_size">i945 VRAM size</h1> + + <p> + Apparently, only 8MB VRAM is available on i945 GPU's (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 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/> + fchmmr: 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/> + fchmmr: "011 = DVMT (UMA) mode, 8 MB of memory pre-allocated for<br/> + fchmmr: frame buffer."<br/> + fchmmr: "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: fchmmr: he suggest that you change the value and look how BSM reacts to that<br/> + stefanct: as he 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/> + fchmmr: so, TOM - BSM + </p> + <p> + <a href="#pagetop">Back to top of page.</a> </p> - <p> - This makes it possible to say remove the HD and still have a booting - machine (using a thumbdrive) - which may be an interesting option to offer - to your users (a "rescue/reinstall" thumbdrive, or a simple failsafe in - case the user wants to reinstall from a CD into a brand new HD) - </p> - - <p> - It's also hacker friendly: - </p> - <ul> - <li> - the memdisk acts as a failsave in case the flash has had its grub.cfg removed or damanged - </li> - <li> - the flash grub.cfg is a failsafe in case the HD grub.cfg was damaged or removed - </li> - </ul> - - <p> - Just some simple if logic, but it does the job. - </p> - - <p> - Besides that, if you want to experiment with fast booting, my systemd - configure script follows. Just boot your kernel with - init=/lib/systemd/systemd. You also need to add at the botton of the - resulting /lib/udev/rules.d/99-systemd.rules the following to make network - configuration automatic:<br/> - <b> - SUBSYSTEM=="net", KERNEL!="lo", TAG+="systemd",<br/> - ENV{SYSTEMD_ALIAS}+="/sys/subsystem/net/devices/$name"<br/> - ENV{SYSTEMD_WANTS}="ifup@%k.service" - </b> - </p> - - <p> - It will put the systemd stuff in /lib/systemd instead of /usr/lib/systemd - (on debian), allowing a peacefull coexistence, and won't use any of the old - /etc/init.d stuff (major cause of slowdown). - </p> - - <p> - This is the exact systemd configuration I used to get a system up in 0.6s - as reported on the mailing list. - </p> - - <p> - Further optimizations of the boot-time requires to optimize the kernel - configuration even more. Here is my current .config (everything is - built-in, slowly removing modules (ex: yenta, firewire) one by one to see - where I can gain speed. - </p> - - <p><a href="#pagetop">Back to top of page.</a></p> - <hr/> <h1 id="lcd_i945_incompatibility">LCD panels on i945 - fix incompatible panels</h1> @@ -226,64 +170,43 @@ written by Michał Masłowski. </p> - <p><a href="#pagetop">Back to top of page.</a></p> - -<hr/> - - <h1 id="blind_x60">Blind X60 - kernel git bisect</h1> - <p> - Older kernels could init GPU on an X60 without a vbios or native graphics. - I have to do a git bisect to find out when that was broken. - </p> - - <ul> - <li>See <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=613979#102">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=613979#102</a></li> - <li><b>git help bisect</b> has an example of how to bisect</li> - <li>See <a href="http://git-scm.com/book/en/Git-Tools-Debugging-with-Git#Binary-Search">http://git-scm.com/book/en/Git-Tools-Debugging-with-Git#Binary-Search</a></li> - <li> - I have ccache. Read on how to compile kernel using ccache instead of regular gcc. (speeds up compiling). How I installed it: - <ul> - <li>sudo apt-get install ccache</li> - <li>echo 'export PATH="/usr/lib/ccache:$PATH"' | tee -a ~/.bashrc \ && source ~/.bashrc && echo $PATH</li> - </ul> - </li> - </ul> - <p> - Note: "memory_corruption_check=0 i915.lvds_channel_mode=2" kernel parameters were once used - successfully for linux-libre 3.10 on a ThinkPad T60 (distribution: Parabola) to get graphics working. + 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/index.html)<br/> + phcoder says: hint for T60: it might be that failing panels are 8bpc<br/> + fchmmr: what does 8bpc mean? And what do you think the other (non-failing) panel are?<br/> + phcoder: 6bpc. bits per colour. May also be reffered as 18-bit vs 24-bit panels<br/> + phcoder: just collect EDIDs from failing and working panels<br/> + <b>phcoder gave me this for collecting EDID data: + <a href="http://www.o2genum.com/2013/08/lp156wh2-tlaa-lcd-panel-edid.html">http://www.o2genum.com/2013/08/lp156wh2-tlaa-lcd-panel-edid.html</a></b> </p> - <p><a href="#pagetop">Back to top of page</a></p> + <p><a href="#pagetop">Back to top of page.</a></p> <hr/> <h1 id="i945_vbt">i945 gfx: X60/T60 VBT implementation (experimental: testing)</h1> + <p> - intel_bios_dumper (use man) in intel-gpu-tools seems interesting. + intel_bios_dumper in intel-gpu-tools seems interesting. </p> <p> - <b>Use 'drm.debug=0x06' kernel parameter when booting in grub! Make sure to use kernel 3.14.4 as before (or any recent kernel).</b> + <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> - Use latest 5927/5320/5345 on X60/T60 (with GTT/3D/kernel3.12 fix) with native graphics initialization. - Load (from the ROM) the runningvga.bin for each LCD panel on each machine; do not execute it, only load it! + Load (from the ROM) the runningvga.bin for each LCD panel on each machine; do not execute it, only load it! (coreboot will have to be modified). Rename the ROM appropriately, based on the machine name and the panel name. coreboot_nativegfx_5868_plusrunningvga_t60_14_LTD141ECMB.rom, for instance. Keep a copy for later use. </p> - <p>It is (theoretically) supposed to:</p> - <ul> - <li>Enable kernel to see VBT tables so that it can see the panel. (theoretically this will make T60 15" XGA/1024x768 work)</li> - </ul> <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> + <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>. @@ -291,78 +214,78 @@ </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> + <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> + </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> @@ -385,11 +308,6 @@ </p> <p> - Use this kernel: - <a href="http://samnoble.org/thinkpad/kernel/linux-image-3.14.4-gnuowen_2_i386.deb">http://samnoble.org/thinkpad/kernel/linux-image-3.14.4-gnuowen_2_i386.deb</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> @@ -491,95 +409,6 @@ <hr/> - <h1 id="cpu_cstates_buzzing">Buzzing / static noise when not using idle=halt or processor.max_cstate=2 in GRUB</h1> - - <p> - When idle, the X60 and T60 make a high pitched whining sound. With a recorder, find out where it originates from. - 'processor.max_cstate=2' or 'idle=halt' kernel parameters can be used in GRUB to remove it. - Alternatively (and for better battery life), another method is to use 'powertop' (see docs/index.html in libreboot release - archives). - </p> - - <p> - funfunctor in IRC says: <i>"sounds like the gain is set to high, AGC of a ADC is not setup correctl probably"</i>. - </p> - <p> - damo22 in IRC says: <i>"damo22: it seems like the T60 (happens on X60 aswell) does not - support certain cpu C-states but is being forced to use them and this causes a noise. i believe it's because - it doesnt let the cpu go into low power state."</i>. - </p> - <p> - CareBear\ in IRC says: <i>"it has to do with the CPU and chipset switching power states differently with coreboot than with the factory BIOS and as a result the power supply circuitry on the mainboard emits that noise. the whine is quite clearly directly related to the CPU switching between power states - "</i> - </p> - - <p> - Another comment (mailing list):<br/> - If this noise doesn't occur with - the vendor firmware, has anybody checked if coreboot uses the same - power management timing settings? (e.g. C4-TIMING_CNT, see [1], there - might be more such settings not mentioned in the public datasheet) <br/> - <b>[1] Intel I/O Controller Hub 7 (ICH7) Family Datasheet Document Number: 307013-003 </b> - </p> - - <p> - - </p> - - <p><a href="#pagetop">Back to top of page.</a></p> - -<hr/> - - <h1 id="battery_eventc">Battery 'event c' on X60 (and T60?)</h1> - <p> - Look into this later. This isn't necessarily a bug, just a part of the code which someone noticed that seems odd. - </p> - <p> - funfuctor: fchmmr: what is 'eventc' exactly in the devicetree of your board? Is that meant to be programed sequentially somehow?<br/> - fchmmr: looks like something with EC<br/> - fchmmr: src/ec/lenovo/h8/chip.h: u8 eventc_enable;<br/> - fchmmr: src/ec/lenovo/h8/h8.c: ec_write(0x1c, conf->eventc_enable);<br/> - funfuctor: fchmmr: yes, better ask phcoder-screen why eventc is defined twice<br/> - funfuctor: and which value is correct<br/> - fchmmr: looks like 0x3c is incorrect<br/> - fchmmr: just a guess<br/> - fchmmr: in devicetree.cb it goes event2 then 3 4 5 6 7 c 8 9 then a b c d<br/> - fchmmr: but i don't know what 'event c' is<br/> - funfuctor: fchmmr: interesting, well in that case you could prob figure it out yourself..<br/> - funfuctor: fchmmr: the order should not matter. basically devicetree is syntax for fill in a C struct<br/> - funfuctor: fchmmr: look closely at build/mainboard/lenovo/t60/static.c<br/> - fchmmr: funfunctor: it was sven schnelle who wrote that (I used 'git blame')<br/> - fchmmr: I think "eventc" has something to do with battery<br/> - fchmmr: commit 95ebe66f7f5fef64d363cb48e5a441ad505353d1<br/> - fchmmr: Author: Sven Schnelle <svens@stackframe.org><br/> - fchmmr: Date: Thu Apr 28 09:29:06 2011 +0000<br/> - fchmmr: that's the commit that added those lines.<br/> - fchmmr: funfunctor:<br/> - fchmmr: "" // C: OEM information<br/> - fchmmr: src/ec/lenovo/h8/acpi/battery.asl<br/> - funfuctor: fchmmr: i'll leave you with the issue of fixing the devicetree duplicate value<br/> - funfuctor: fchmmr: you need to read the datasheet to figure out what register 0x3C is<br/> - funfuctor: sorry *0x1C rather<br/> - funfuctor: grep eventc src/ec/lenovo/h8/h8.c<br/> - funfuctor: ec_write(0x1c, conf->eventc_enable);<br/> - Also look in src/ec/lenovo/h8/h8.c and src/ec/lenovo/h8/chip.h and src/mainboard/lenovo/x60/devicetree.cb<br/> - Do a 'git blame' and a 'git log path/to/file' etc. ask sven, even. - </p> - <p><a href="#pagetop">Back to top of page.</a></p> - -<hr/> - - <h1 id="unlisted">Unlisted Notes</h1> - <p> - funfunctor: shadow compiling means you run both compilers (context: GCC and Clang/LLVM) at the same time. If one compiler misses a problem the other compiler hopefully finds it<br/> - funfunctor: fchmmr: blow your mind (compiler security and reprodicible builds) - http://scienceblogs.com/goodmath/2007/04/15/strange-loops-dennis-ritchie-a/ - </p> - <p> - <a href="#pagetop">Back to top of page.</a> - </p> - -<hr/> - <p> Copyright © 2014 Francis Rowe <info@gluglug.org.uk><br/> This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions. |