Fixes uploaded to the trusty and vivid queues.
** Description changed:
- 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".
+ == 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
-
- ProblemType: Bug
- DistroRelease: Ubuntu 14.04
- Package: flash-kernel 3.0~rc.4ubuntu48+fix1
- ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
- Uname: Linux 3.13.0-20-generic armv7l
- ApportVersion: 2.14.1-0ubuntu1
- Architecture: armhf
- Date: Sat Apr 12 01:55:45 2014
- SourcePackage: flash-kernel
- UpgradeStatus: No upgrade log present (probably fresh install)
** Changed in: flash-kernel (Ubuntu Trusty)
Status: New => In Progress
** Changed in: flash-kernel (Ubuntu Vivid)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1306841
Title:
Wandboard i.MX6 Quad Board has different boot device
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