I've written a developer tool that you can use to update a device tarball with a new kernel. I've used this to roll forward from the 15.04 kernel (3.19) to a 4.0 kernel on the Beaglebone Black. You can find it here: git://kernel.ubuntu.com/rtg/snappy-tools.git

For example:

./snappy-build-oem-tarball.sh --deb=../linux-image-4.0.0-1-generic_4.0.0-1.1_armhf.deb --stball=device.tar.xz

This script extracts the relevant bits from the original device tarball and the kernel deb package and creates a new device tarball (device-oem.tar.gz).

I've not tried this on x86, but it ought to be arch independent.

rtg
--
Tim Gardner [email protected]

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