#528
Keep in mind that there are two *separate* issues:
1. Bug off-by-one bug in intel-spi driver that causes CMP bit to accidentally
set to 1. This results BIOS
being read-only. The bug was fixed by 9d63f17661e2 ("spi-nor: intel-spi: Fix
broken software sequencing
codes") in september.
2. Some Lenovo Thinkpad Yoga BIOSes reset to default settings if their BCR
register is touched. This BCR
handling is in a different driver (drivers/mfd/lpc_ich.c). This issue has
been fixed by commit
d9018976cdb6 ("mfd: lpc_ich: Do not touch SPI-NOR write protection bit on
Haswell/Broadwell") in july.
So in order to have a kernel that is free from both issues, you need to
disable the intel-spi driver (for reasons being that it is not supposed
to be enabled for normal users anyway) and then cherry-pick commit
d9018976cdb6 to make sure the other issue does not happen.
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https://bugs.launchpad.net/bugs/1734147
Title:
corrupted BIOS due to Intel SPI bug in kernel
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