[Bug 1306841] Re: Wandboard i.MX6 Quad Board has different boot device

[Stéphane Graber]

I just uploaded a fix to wily which should fix that.

I'll SRU it back to trusty too.

** Also affects: flash-kernel (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Also affects: flash-kernel (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: flash-kernel (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1306841

Title:
  Wandboard i.MX6 Quad Board has different boot device

Status in flash-kernel package in Ubuntu:
  Fix Released
Status in flash-kernel source package in Trusty:
  New
Status in flash-kernel source package in Vivid:
  New

Bug description:
  == Rationale ==
  The wandboards have two microsd slots, one directly tied to the SoC and one on the main board. The wandboard only boots from the one tied to the SoC.

  Unfortunately, the device numbering is wrong, in that when only the
  SoC slot is populated, it'll appear as mmcblk0, but when both slots
  are, the SoC slot becomes mmcblk1.

  So far flash-kernel has only supported the configuration with both
  slots populated, but it's reasonably common for people to only use the
  SoC slot and then use the SATA port to attach more storage.

  The fix is to use the constant path name from udev which always points
  to the right slot.

  == Testcase ==
   - Run flash-kernel before update => fails to find sdcard
   - Run flash-kernel after update => finds sdcard and install kernel
   - Reboot to check that things boot as expected

  == Regression potential ==
  Should a system somehow miss the /dev/disk/by-path symlink, flash-kernel may fail to install the new kernel. Note that testing on 5 different boards showed that this symlink is constant, regardless of storage configuration, so this shouldn't be an actual problem.

  == Original bug report ==
  The Wandboard i.MX6 Quad Board has two sdcard slots. The boot device is set to "/dev/mmcblk1p1", but this device only exists if both sdcard slots are used. I use just one sdcard and my boot device is called "/dev/mmcblk0p1".

  flash-kernel need to dynamically detect the correct sdcard slot or use
  a unique device name.

  I have following device symlink on my system:
  /dev/disk/by-id/mmc-SD16G_0xd62aac9a-part1
  /dev/disk/by-path/platform-2198000.usdhc-part1
  /dev/block/179:1

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