** Description changed:
- New bug forked out of Bug #1734147 "corrupted BIOS due to Intel SPI bug
- in kernel Edit"
+ == SRU Justification ==
+ New bug forked out of Bug #1734147 "corrupted BIOS due to Intel SPI bug in
kernel Edit"
When trying to apply the proposed fix in Bug #1734147 to a Lenovo Yoga
with Serial Flash s25fl064k, the actual fix works, however reverting
back to original available Kernel <4.14.x again locks the BIOS for
write.
How to identify chip: Using the Fix Kernel from Bug #1734147 the kernel log
will show intel-spi entries.
In lower part serial is shown as below:
intel-spi intel-spi: s25fl064k (8192 Kbytes)
Additional Information:
Lenovo Yoga running Linux Mint 18.3 (based on Xenial 16.04)
Bug #1734147 occured when trying Ubuntu 17.10
-
Explanation by Mika Westerberg (Bug #1734147, Comment #524)
"commit d9018976cdb6 is missing with this particular BIOS/system because
every time you boot the system, the BIOS resets to default when it finds BCR
register is changed. This is different issue than the CMP=1 issue most of the
users have reported. This one also is not permanent so everything is fine as
long as you don't touch that BCR register. In this case you either need to
always boot to a kernel where that fix (d9018976cdb6) is included or blacklist
lpc_ich.ko. Ubuntu v4.14.x kernels have that fix included so you might want to
take one of them or build your own."
+
+ == Fixes ==
+ d9018976cdb6 ("mfd: lpc_ich: Do not touch SPI-NOR write protection bit on
Haswell/Broadwell")
+ 9d63f17661e2 ("spi-nor: intel-spi: Fix broken software sequencing codes")
+
+ == Regression Potential ==
+ Low, these patches fix an existing critical regression.
+
New bug requested to discuss this separate from main Bug #1734147
Anthony Wong (Bug #1734147, Comment #525)
"Looks like we need to cherry-pick it to 4.13 after all.
Christian, do you mind opening a new bug for your issue? We should continue
the discussion and fix over there."
** Changed in: linux (Ubuntu)
Importance: Medium => Critical
** Changed in: linux (Ubuntu Artful)
Importance: Medium => Critical
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https://bugs.launchpad.net/bugs/1742696
Title:
Commit d9018976cdb6 missing in Kernels <4.14.x preventing lasting fix
of Intel SPI bug on certain serial flash
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