Couple of observations:

flash-kernel requires uboot-mkimage installed for most of it's targets
but does not depend on it (only suggests). I'm not sure if that makes
sense. But this is a generic issue.

Another issue is that the flash-kernel.conf will contain the wrong
partition when on eMMC. This is because Snowball eMMC images contain a
special partition that the boot rom requires, and this shows up as
mmcblock0p1 which is the default boot device for linaro-media-create. It
should be changed to p2 which is the FAT partition with the boot scripts
and kernel.

Doing the above plus applying the patch to flash-kernel
(2.28ubuntu34linaro2) makes kernel flashing work for snowball.

So what we need is to study how to make l-m-c create a flash-kernel.conf
with the correct boot partition, integrate this patch and somehow make
sure that uboot-mkimage is installed by default on the images. Then we
should be good to go with deploying kernel updates through apt-get
install (kernel packaging contains a flash-image hook).

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https://bugs.launchpad.net/bugs/846394

Title:
  Snowball not supported

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