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[Anton Blanchard <anton@xxxxxxxxx>]

This was fixed in bug #1326199

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https://bugs.launchpad.net/bugs/1416548

Title:
  IBM Power8 requires rootdelay= in order to boot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  ubuntu@P8:~$ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  After installing Ubuntu 14.04 onto an IBM Power8 using bare metal
  mode, the installation will not boot unless setting a rootdelay
  timeout as a kernel flag.

  The following error occurs at boot otherwise:

  Gave up waiting for root device.  Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay= (did the system wait long enough?)
     - Check root= (did the system wait for the right device?)
   - Missing modules (cat /proc/modules; ls /dev)
  ALERT!  /dev/disk/by-uuid/ad097f75-53df-40dc-9660-2397ac629778 does not exist.  Dropping to a shell!

  A setting of rootdelay=190 seems to work whereas 90 was not long
  enough.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-44-generic 3.13.0-44.73
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic ppc64le
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: ppc64el
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDmesg:
   
  Date: Fri Jan 30 16:11:28 2015
  HibernationDevice: RESUME=UUID=f8fdf988-698a-424f-99ec-f1bcd83535fd
  InstallationDate: Installed on 2015-01-29 (1 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release ppc64el (20140416.2)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: root=UUID=ad097f75-53df-40dc-9660-2397ac629778 ro splash quiet rootdelay=190
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-44-generic N/A
   linux-backports-modules-3.13.0-44-generic  N/A
   linux-firmware                             1.127.11
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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