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
|
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style type="text/css">
@import url('../css/main.css');
</style>
<title>Maintaining libreboot</title>
</head>
<body>
<div class="section">
<h1 id="pagetop">Maintaining libreboot</h1>
<p>
This section relates to maintaining libreboot. <b>Work-in-progress</b>
</p>
<p>
Do not follow anything here to the letter; is it only a guide
representing how libreboot is maintained (for reference). This
will be added to frequently from now on.
</p>
<p>
This section of the documentation applies mainly to the
development version of libreboot, which is hosted in a git
repository. It is not intended for the release versions of
libreboot.
</p>
<ul>
<li><a href="#overview">Overview</a></li>
<li>
<a href="#updating_coreboot">Updating coreboot-libre</a>
<ul>
<li><a href="#newboard_libreboot">Adding a new board to libreboot</a></li>
<li><a href="#newpatch_libreboot">Add/remove/modify patches in coreboot-libre</a></li>
</ul>
</li>
<li>
<a href="#updating_grub">Updating GRUB</a>
<ul>
<li><a href="#newpatch_grub">Add/remove/modify patches in GRUB</a></li>
<li><a href="#altbuild_grub_payload">Change how the GRUB payload (grub.elf) is built (utility: grub-assemble)</a></li>
<li><a href="#newconfig_grub">Modify the configuration used in GRUB</a></li>
<li><a href="../grub/index.html">Other maintenance-related tasks in GRUB</a></li>
</ul>
</li>
<li>
<a href="#updating_flashrom">Updating flashrom</a>
<ul>
<li><a href="#newpatch_flashrom">Add/remove/modify patches in flashrom</a></li>
</ul>
</li>
<li>
<a href="#updating_bucts">Updating bucts</a>
<ul>
<li><a href="#newpatch_bucts">Add/remove/modify patches in bucts</a></li>
</ul>
</li>
<li>
<a href="#updating_memtest86plus">Updating MemTest86+</a>
<ul>
<li><a href="#newpatch_memtest86plus">Add/remove/modify patches in MemTest86+</a></li>
</ul>
</li>
</ul>
<p>
Or <a href="../index.html">Back to main index</a>.
</p>
</div>
<div class="section">
<h1 id="overview">Overview</h1>
<p>
The way the libreboot project is run is very similar to how
a GNU/Linux distribution project is run (but for the boot
firmware, not your operating system).
</p>
<p>
This page demonstrates on a high level how
libreboot is maintained, how the project is run, how everything
goes together, etc. For a more detailed guide, refer to each
subsection for the various components/modules used in libreboot.
</p>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="updating_coreboot">Updating coreboot-libre</h1>
<p>
NOTE: it helps to own all libreboot-compatible systems here,
or have reliable (and fast) access to a team of testers.
</p>
<p>
Coreboot-libre is the name of the deblobbed coreboot sources
used in libreboot. It is also the name of the collection
of scripts used for deblobbing coreboot, on each new update.
</p>
<p>
This section shows an example of how to update (re-base) to
the latest version of coreboot, how to update the deblobbing
scripts, and so on. <b>This does not teach you how to
change what custom patches are used, nor does it tell
you how to add new boards to libreboot. It assumes that you
simply want to re-base to the latest version (for instance,
there could be bug fixes that you want). For those things
not listed in this section, you can refer to other sections
on this page instead.</b>
</p>
<p>
Open these files in your editor (you will most likely be editing them):
</p>
<ul>
<li>resources/scripts/helpers/download/coreboot</li>
<li>resources/scripts/helpers/build/module/coreboot</li>
<li>resources/utilities/coreboot-libre/deblob</li>
<li>resources/utilities/coreboot-libre/nonblobs</li>
<li>resources/utilities/coreboot-libre/nonblobs_notes</li>
<li>resources/scripts/helpers/build/roms/helper</li>
<li>resources/scripts/helpers/build/roms/withgrub</li>
</ul>
<p>
If you already had a coreboot/ directory in your libreboot
tree, delete it:<br/>
$ <b>rm -rf coreboot/</b>
</p>
<p>
Firstly, download coreboot. Do <b>not</b> use <b>./download coreboot</b>
for this, just clone coreboot, as it does in that script, like so:<br/>
$ <b>git clone http://review.coreboot.org/coreboot</b>
</p>
<p>
$ <b>cd coreboot/</b><br/>
Get the ID of the latest commit in this clone, by reading the commit ID using
e.g.:<br/>
$ <b>git log</b><br/>
In <i>resources/scripts/helpers/download/coreboot</i> you will
find a line that says <i><b>git reset --hard</b></i> and then
a commit ID next to it. Replace this with the commit ID of the latest
commit from the coreboot version that you just downloaded.
</p>
<p>
Delete the .git* resources. For example:<br/>
$ <b>rm -rf .git*</b><br/>
...this is to avoid the deblobbing script from picking up files
in there as blobs, which would be only false positives and
increase the amount of time taken. Now come out of coreboot:<br/>
$ <b>cd ../</b>
</p>
<p>
Check all coreboot file names/paths in <i>deblob</i>; if any
of them no longer exist at that name/path in the coreboot tree that you downloaded,
delete the reference(s) in <i>deblob</i>.
</p>
<p>
Check all coreboot file names/paths in <i>nonblobs</i>; if
any of them no longer exist at that name/path in the coreboot tree that you downloaded,
delete the reference in <i>nonblobs</i>.
</p>
<p>
Now, back in the main root directory of libreboot (git repository),
run the deblob script. This is to prevent the <i>findblobs</i>
scripts from finding the blobs that are already deleted
when running the <i>deblob</i> script. Like so:<br/>
$ <b>./resources/utilities/coreboot-libre/deblob</b>
</p>
<p>
Now search for new blobs:<br/>
$ <b>cd resources/utilities/coreboot-libre/</b><br/>
$ <b>./findblobs</b><br/>
WARNING: this will take a <b>*long*</b> time. Be patient!
What this will do is look through the coreboot source directory,
looking for blobs. It will not find the blobs that you deleted
before (because they no longer exist), and it will ignore any
files listed in <i>nonblobs</i>.
</p>
<p>
Once the <i>findblobs</i> script has finished, check the file
<i>tocheck</i> (from the root, this will be <i>resources/utilities/coreboot-libre/tocheck</i>).
These are the files detected as blobs; some might be blobs, some not.
The <i>findblobs</i> script doesn't know how to determine between blobs
and non-blobs, it only knows patterns. Distinguishing between blobs and
non-blobs must be performed by you, the human being.
</p>
<ul>
<li>
Files in <i>tocheck</i> that you identify as blobs,
should be added appropriately to <i>resources/utilities/coreboot-libre/deblob</i>
</li>
<li>
Files in <i>tocheck</i> that you identify as non-blobs,
should be added appropriately to <i>resources/utilities/coreboot-libre/nonblobs</i> -
also, if you feel it necessary, add an explanation of it in
<i>resources/utilities/coreboot-libre/nonblobs_notes</i>
</li>
</ul>
<p>
Now come back to the main libreboot root directory (root
of the git clone). If you are still in resources/utilities/coreboot-libre/
for instance, you would do something like:<br/>
$ <b>cd ../../../</b>
</p>
<p>
Now delete the coreboot directory:<br/>
$ <b>rm -rf coreboot/</b>
</p>
<p>
Download coreboot again, only this time, using the download
script. The download script also applies custom patches
to coreboot (see resources/scripts/helpers/download/coreboot);
if they do not apply anymore, you will have to re-base them
and then update <i>resources/scripts/helpers/download/coreboot</i>
accordingly. Anyway, download coreboot like so:<br/>
$ <b>./download coreboot</b>
</p>
<p>
If the custom patches no longer apply, and you have to re-base
(or replace?) some patches, please do this in coreboot upstream,
not in libreboot. Then re-include new patches from upstream,
into libreboot. Here is coreboot's guide for contributing
patches:<br/>
<a href="http://www.coreboot.org/Git">http://www.coreboot.org/Git</a>.
</p>
<p>
Update all configs:<br/>
$ <b>./build config corebootupdate</b><br/>
This simply takes all of the coreboot <b>.config</b> files from
<i>resources/libreboot/config/</i> and does <b>make oldconfig</b>
on them. It usually works. If it doesn't, you'll need to recreate
those configs from scratch using <b>./build config corebootreplace</b> (optionally
add a config name), or <b>./build config corebootmodify</b> (ditto)
(see <a href="../git/index.html#config">../git/index.html#config</a>)
</p>
<p>
Finally, build *all* ROM images using the instructions at
<a href="../git/index.html">../git/index.html</a>, to verify
that everything still builds.
</p>
<p>
Once you've verified that building isn't broken, test *all*
boards (you don't need to test all ROM images, only one
vesafb and one txtmode image for each configuration). If you
do not have all systems supported in libreboot, then you will
need to get other testers for those boards.
</p>
<p>
If you have established a build issue, or a board no longer
works (booting issues, bugs during/after boot, etc), you'll
need to fix it upstream:
<a href="http://www.coreboot.org/Git">http://www.coreboot.org/Git</a>
and then re-update coreboot (or apply patches from upstream).
</p>
<p>
You should also test the resulting ROM images from building
with the new or modified coreboot revision.
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="newboard_libreboot">Adding a new board to libreboot</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="newpatch_libreboot">Add/remove/modify patches in coreboot-libre</h1>
<p>
Under <b>resources/scripts/helpers/download/coreboot</b> you can find
the instructions used for patching coreboot.
</p>
<p>
Modify the commit ID on the <i>git reset --hard</i> line accordingly,
and update the list of patches used accordingly. Do not cherry-pick
from review.coreboot.org directly; instead, include the diff in
resources/libreboot/patch/ and use <i>git am</i>
(you can get the diff by using git-format-patch).
</p>
<p>
When you're done, simply download coreboot again:<br/>
$ <b>./download coreboot</b>
</p>
<p>
Finally, re-build the parts from coreboot that are used
by the build system:<br/>
$ <b>./build module coreboot</b>
</p>
<p>
Instead of running the above command, you can save time
by copying out the crossgcc that you compiled before
(from coreboot/util/crossgcc/) and then putting it back.
After you've done that, run everything in
<i>resources/scripts/helpers/build/module/coreboot</i>
except for the part that builds GCC.
</p>
<p>
You should also test the resulting ROM images from building
with the new or modified coreboot revision.
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="updating_grub">Updating GRUB</h1>
<p>
$ <b>rm -rf grub/</b><br/>
$ <b>git clone git://git.savannah.gnu.org/grub.git</b>
$ <b>cd grub/</b>
$ <b>git log</b>
</p>
<p>
Open the file <i>resources/scripts/helpers/download/grub</i> and
replace the commit ID on the line that performs <i>git reset --hard</i>
with the commit ID of the GRUB revision that you just downloaded.
</p>
<p>
$ <b>cd ../</b><br/>
$ <b>./download grub</b>
</p>
<p>
If it fails because of merge conflicts, you'll need to re-base
or (as appropriate) remove the offending patch(es) in
<i>resources/scripts/helpers/download/grub</i>.
</p>
<p>
Finally, verify that it will build:<br/>
$ <b>./build module grub</b>
</p>
<p>
Since GRUB is the payload in libreboot, you should also
build the ROM images and test them, with this different
GRUB version that you have prepared.
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="altbuild_grub_payload">Change how the GRUB payload (grub.elf) is built (utility: grub-assemble)</h1>
<p>
Look in <i>resources/utilities/grub-assemble/</i>.
</p>
<p>
<i>gen.sh</i> creates ELF executables of GRUB with different configurations:
text-mode or framebuffer mode in coreboot. Essentially,
the text-mode version has no background nor any custom fonts,
and contains MemTest86+. You probably don't need to modify these
files at all.
</p>
<p>
<i>grub_memdisk_keymap</i> simply adds all the keyboard layout
files. The keymap files are in <i>keymap/</i>, and
can be added to using the instructions at
<a href="../grub/index.html#grub_custom_keyboard">../grub/index.html#grub_custom_keyboard</a>.
</p>
<p>
<i>modules.conf</i> defines which modules will be included in the GRUB
ELF executable.
</p>
<p>
Since GRUB is the payload in libreboot, you should also
build the ROM images and test them, with this different
GRUB version that you have prepared.
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="newconfig_grub">Modify the configuration used in GRUB</h1>
<p>
Look in <i>resources/scripts/helpers/build/roms/withgrub</i> to
see how the GRUB configuration files are generated.
</p>
<p>
You might need to modify this. You can also modify the
default configuration by making changes to the files
under <i>resources/grub/config/</i>
</p>
<p>
Since GRUB is the payload in libreboot, you should also
build the ROM images and test them, with this different
GRUB version that you have prepared.
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="updating_flashrom">Updating flashrom</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="newpatch_flashrom">Add/remove/modify patches in flashrom</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="updating_bucts">Updating bucts</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="newpatch_bucts">Add/remove/modify patches in bucts</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="updating_memtest86plus">Updating MemTest86+</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<h1 id="newpatch_memtest86plus">Add/remove/modify patches in MemTest86+</h1>
<p>
TODO: write this section
</p>
<p>
<a href="#pagetop">Back to top of page</a>.
</p>
</div>
<div class="section">
<p>
Copyright © 2015 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>
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>
</div>
</body>
</html>
|
