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[Bug 1571798] Re: Broadwell ECRC Support missing in Ubuntu


ea584595fc85e65796335033dfca25ed655cd0ed was reported as the first bad
commit, but it is a merge:

commit ea584595fc85e65796335033dfca25ed655cd0ed
Merge: 782d59c a092e19
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date:   Thu Oct 9 14:58:15 2014 -0400

    Merge tag 'gpio-v3.18-1' of

The bisect may have gone bad due to marking a test kernel good when it was actually bad or vice versa.  We may need to test some of the previously posted kernels and ensure they were really bad or good.

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  Broadwell ECRC Support missing in Ubuntu

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  In Progress

Bug description:
  Here is the problem statement from the Dell team:

  When booting into Ubuntu 14.04.4 with a Broadwell CPU and an Intel
  Quick Assist Card, the memory location that corresponds to ECRC is set
  to 0x01e0, when the BIOS is setting this location 0x00a0 pre-OS boot.
  This causes the card to not function unless we implement the following
  workaround using setpci.

  “setpci –s AA:BB.C 160.w=0”, where AA:BB.C is the PCI Root Path for
  the Intel Quick Assit Card.

  We’ve verified the memory location is correct when booting to other
  OSes, such as RHEL 7.2 and Windows Server 2012 R2.

  If there is any information you can give as to why this may be
  occurring in Ubuntu or where we may start to debug when the memory is
  changed, we would appreciate it.

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