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Coreboot is enabling PECI on these CPUs which, according to Intel erratum, must
only be done after loading microcode updates, otherwise the CPUID feature set
becomes corrupted. That's my understanding, and I think this is why SpeedStep
is broken. To be specific, it could but but operating systems no longer detect
that the feature is supported. In any case, belgin on IRC found the commit in
coreboot, after a bisect, enabling PECI. This commit in Libreboot adds a patch,
reverting coreboot's PECI patch.
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tianocore is a liability for the libreboot project. it's a bloated mess, and
unreliable, broken on many boards, and basically impossible to audit.
i don't trust tianocore, so i'm removing it.
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you must de-solder the default chip and install the new one.
winbond w25q128fvsig is a nice choice of 16MB (128Mbit) IC
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4mb and 8mb users can just pad their roms to 16mb, using the instructions on
<https://libreboot.org/faq.html#how-do-i-pad-a-rom-before-flashing>
maintaining them in lbmk is a waste of time, and also a hazard because it's a
lot of duplicated labour when making any changes, which could result in awful
mistakes being made
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See:
<https://lists.nongnu.org/archive/html/libreboot/2016-08/msg00063.html>
This enables all SATA ports, allowing full T400s compatibility. T400s already
works just fine, when flashing a T400 ROM, but not all SATA ports were usable.
The specific patch is here:
<https://lists.nongnu.org/archive/html/libreboot/2016-08/txtgT_L8DC94R.txt>
There was also this patch, which coreboot actually adapted upstream:
<https://lists.nongnu.org/archive/html/libreboot/2016-08/txtMXyws85Q_P.txt>
Yes, this patch was submitted in 2016. I overlooked it, during all this time.
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mitigate missing characters in unifont for border/arrow characters. this saves
space because now it is no longer necessary to add a custom font
the background added has the libreboot logo on it, and it's 10kb in size unlike
the old gnulove background that was hundreds of KB
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These option ROMs are known to cause a system hang. If you insert an empty
option ROM into CBFS, it disables any option ROM loading for those devices
when using SeaBIOS.
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improved battery life on macbook21
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This fixes issue 3:
https://notabug.org/libreboot/lbmk/issues/3
In this issue, GM45 laptops such as X200/T400 will hang on reboot (normal boot
works, and shutting down works too).
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similar to x200
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libgfxinit_txtmode with seabios only
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For add-on GPU, use one of the SeaBIOS images.
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Use seabios ROM if you want to use an add-on GPU.
seabios_withgrub and seabios_grubfirst are also available.
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SeaBIOS should fit nicely, now that memtest is disabled
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2MiB and 16MiB were the only flash sizes supported. 4 and 8MiB have been
added.
Now there are only libgfxinit_txtmode configs.
Use seabios_withgrub or seabios_grubfirst ROMs if you wish to use an add-on
GPU.
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this is forked from the "libre" branch in osboot, which is itself a libre,
deblobbed fork of osboot, a blobbed up fork of libreboot
libreboot needed to be purged clean. this is the new libreboot development
repository. the old one has been abandoned
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