** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Released

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  Commit d9018976cdb6 missing in Kernels <4.14.x preventing lasting fix
  of Intel SPI bug on certain serial flash

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Artful:
  Fix Committed

Bug description:
  == 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

  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 
  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."

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