summaryrefslogtreecommitdiffstats
path: root/docs/future/index.html
blob: 0bdabf49151e7ea804b39e836989512baf4fa490 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>libreboot tutorials</title>

	<style type="text/css">
		body {
			font-family: sans-serif;
			font-size: 1em;
			background: #fff;
			color: #000;
		}
		
	</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>

	<header>
		<h1 id="pagetop">Development notes</h1>
		<aside>These are development notes, for future use. For old (obselete) notes, see <a href="old.html">old.html</a>.</aside>
	</header>

	<p>
		Or go <a href="../">back to main document index</a>.
	</p>

<hr/>

	<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="#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/>

	<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>

<hr/>

	<h1 id="t60_cpu_microcode">T60 cpu microcode</h1>

		<p>
			TODO: T60: find (for rare buggy CPU's 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>

<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)
		</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>

		<p>
			Fix T60 issues (see incompatible panels listed at <a href="../index.html#supported_t60_list">../index.html#supported_t60_list</a>).
		</p>

		<p>
			Run that tool (resources/utilities/i945gpu/intel-regs.py) as root on machines 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><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: &quot;memory_corruption_check=0 i915.lvds_channel_mode=2&quot; kernel parameters were once used
			successfully for linux-libre 3.10 on a ThinkPad T60 (distribution: Parabola) to get graphics working.
		</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.
		</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>
		</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!
			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&quot; 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>

		<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 machine.
		</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&quot; 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&quot; SXGA+</b>
				<ul>
					<li>TMD-Toshiba LTD141EN9B: #</li>
					<li>Samsung LTN141P4-L02: #</li>
					<li>Boe-Hydis HT14P12: #</li>
				</ul>
			</li>
			<li>
				<b>T60 15&quot; 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&quot; SXGA+</b>
				<ul>
					<li>LG-Philips LP150E05-A2K1: #</li>
					<li>BOE-Hydis HV150P01-100: #</li>
				</ul>
			</li>
			<li>
				<b>T60 15&quot; 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&quot; 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>

<hr/>

	<h1 id="intelvbttool_results">intelvbttool test results (VGA ROM's)</h1>
		<p>
			The VBIOS on i945 (intel gpu) platforms is self-modifying; that is,
			it's 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" target="_blank">http://review.coreboot.org/#/c/5396</a>.
		</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>

		<p>
			T60 has DVI on it's 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 machine and LCD panel used.
			<a href="../index.html#get_edid_panelname">../index.html#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&quot; 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&quot; 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&quot; 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&quot; SXGA+ (1400x1050):</b>
				<ul>
					<li>LG-Philips LP150E05-A2K1: #</li>
					<li>BOE-Hydis HV150P01-100: #</li>
				</ul>
			</li>
			<li>
				<b>T60 15&quot; 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&quot; 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>

<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>&quot;sounds like the gain is set to high, AGC of a ADC is not setup correctl probably&quot;</i>.
		</p>
		<p>
			damo22 in IRC says: <i>&quot;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.&quot;</i>.
		</p>
		<p>
			CareBear\ in IRC says: <i>&quot;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
			&quot;</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 &quot;eventc&quot; has something to do with battery<br/>
		fchmmr:  commit 95ebe66f7f5fef64d363cb48e5a441ad505353d1<br/>
		fchmmr:  Author: Sven Schnelle &lt;svens@stackframe.org&gt;<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:                  &quot;&quot;                      // 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 &copy; 2014 Francis Rowe &lt;info@gluglug.org.uk&gt;<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>
		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>
</html>