diff options
Diffstat (limited to 'docs/future/index.html')
| -rw-r--r-- | docs/future/index.html | 239 |
1 files changed, 12 insertions, 227 deletions
diff --git a/docs/future/index.html b/docs/future/index.html index 3eee4f7..0bdabf4 100644 --- a/docs/future/index.html +++ b/docs/future/index.html @@ -24,7 +24,7 @@ <header> <h1 id="pagetop">Development notes</h1> - <aside>These are development notes, for future use.</aside> + <aside>These are development notes, for future use. For old (obselete) notes, see <a href="old.html">old.html</a>.</aside> </header> <p> @@ -41,10 +41,6 @@ <li><a href="#fastboot">Fast boot</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="#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> <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> @@ -53,33 +49,6 @@ <hr/> - <h1 id="todo">TODO (bold means high priority)</h1> - <ul> - <li> - <b><a href="#intelvbttool_results">#intelvbttool_results</a>: Finish getting runningvga.bin dumps and intelvbttool dumps for all known targets on X60 and T60.</b> - <ul> - <li>Figure out why 15" T60 with 1024x768 panel doesn't work on native graphics initialization. And fix it (implementing VBT might, also understanding how - to correctly interpret EDID, according to phcoder and damo22).</li> - <li><b><a href="#i945_vbt">#i945_vbt</a>: Finish getting results when running native init and loading (but not executing) the VBIOS option ROM.</b></li> - <li>When VBT is implemented/tested, also test SeaVGABIOS (part of SeaBIOS)</li> - </ul> - </li> - <li>test that patch (DYNAMIC_CBMEM, <a href="http://review.coreboot.org/#/c/6036">http://review.coreboot.org/#/c/6036</a>) on X60 and T60 for kmalkki</li> - <li>Further study how backlight controls work</li> - <li>funfunctor (from coreboot IRC) wants me to try building libreboot/coreboot on X60 with clang/llvm because he says there are some issues where boards fail when built with this: fchmmr: well you will need to compile the latest clang, here are some instructions: https://gist.github.com/victoredwardocallaghan/38689e88dd7b9a439468 and also: funfunctor: fchmmr: you will need the latest coreboot code and http://review.coreboot.org/#/c/5814/ to get clang to build whatever board. also! <br/><br/> - - fchmmr: see this topic http://review.coreboot.org/#/q/status:open+project:coreboot+branch:master+topic:clang-fixes,n,z you will need those fixes to get anywhere with building t60/x60 with clang. at the time of writing that was 6122/1, 6121/1, 6120/1 and 6119/1<br/><br/> - - fchmmr: its unclear if http://review.coreboot.org/#/c/6129/ has uncovered a bug yet or not..fchmmr: well this was a bug spotted http://review.coreboot.org/#/c/6052/<br/><br/> - - funfunctor says X60 (not sure about T60) ROM's can now be built with Clang/LLVM</li> - <li>Investigate <a href="#battery_eventc">#battery_eventc</a>.</li> - </ul> - - <p><a href="#pagetop">Back to top of page</a></p> - -<hr/> - <h1 id="standard_test">standard test</h1> <p> These logs are usually obtained when testing changes related to graphics on i945 (X60 and T60). @@ -289,199 +258,6 @@ <hr/> - <h1 id="x60_native_notes">X60 native graphics initialization (with backlight controls)</h1> - <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). He 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 machine (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; he says his 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> - -<hr/> - - <h1 id="t60_native_notes">T60 native graphics initialization (with backlight controls)</h1> - <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="../index.html#get_edid_panelname">../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="../index.html#supported_t60_list">../index.html#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> - -<hr/> - - <h1 id="5320_kernel312fix">i945: 3D fix (based on 5927) for kernel 3.12+ on 5320</h1> - - <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> - -<hr/> - - <h1 id="x60_cb5927_testing">i945/X60: Coreboot 5927 testing (3D fix for kernel 3.12+ on replay code)</h1> - - <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 machines/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> - -<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. @@ -802,9 +578,18 @@ <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. + A copy of the license can be found at <a href="../license.txt">../license.txt</a>. + </p> + <p> - Copyright © 2014 Francis Rowe, All Rights Reserved.<br/> - See <a href="../license.html">../license.html</a> for license conditions. + This document is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See <a href="../license.txt">../license.txt</a> for more information. </p> </body> |