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

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https://bugs.launchpad.net/bugs/1688132

Title:
  Support IPMI system interface on Cavium ThunderX

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Committed
Status in linux source package in Zesty:
  Fix Released

Bug description:
  [Impact]
  The IPMI system interface (/dev/ipmi0) is unavailable on Cavium 
ThunderX-based systems. This prevents various in-band management tasks, 
including auto-enlistment using MAAS.

  [Test Case]
  sudo modprobe ipmi_ssif
  sudo modprobe ipmi_devintf

  Do you have a working /dev/ipmi0?
  sudo ipmitool lan print

  [Regression Risk]
  For hwe-z, this is a small fix to a driver that is only used on 
ThunderX-based systems, and is currently not usable w/o magic manual steps.

  For hwe-x and hwe-y, this also impacts the i2c-octeon driver. After
  hwe-y, upstream split that driver into 2 pieces to factor out code
  that could be shared with i2c-thunderx, and then i2c-thunderx was
  added. i2c-octeon is a driver for Cavium OCTEON systems, which are
  MIPS64 - an architecture unsupported by Ubuntu, so regression risk is
  negligible. i2c-thunderx is a new driver that is only loaded on
  ThunderX-based systems, so the testing we've performed on ThunderX
  should mitigate that regression risk.

  Note: there are issues with older firmware (version varies depending
  on platform) where the IPMI device can vanish between reboots,
  requiring a BMC reset to recover. This doesn't cause any other problem
  - drivers don't load, and it's as if this driver was never added.
  However, it is worth noting here in case people google it. Please
  upgrade your firmware if you run into this.

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