Build the "boot" partition image (just like the rootfs)

["Mike Looijmans" <mike.looijmans@topic.nl>]

For software updates, I want to have what would have gone into the boot 
partition of the WIC image as a separate file.

If I want to have the contents of the rootfs as an ext4 image, I can 
just specify IMAGE_TYPES="ext4" in my image recipe.

This image I can feed to SWUdate and write to the rootfs storage.

But I also want to be able to update the boot partition (for example, 
the raspberrypi has the annoying property that devicetree and kernel 
reside here).

If I create a WIC image, the boot partition is in there with the proper 
files (from IMAGE_BOOT_FILES) so I would really like to re-use that 
code. I could create the wic image and then cut out the part I want, but 
that doesn't seem particularly nice.

What I want to do at update time is to write the new boot partition to 
another location on disk, and then adjust the partition table to make 
the first partition entry point to the new copy. That way, in case of 
unexpected failure (power loss for example), the device remains bootable.


-- 
Mike Looijmans


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Products B.V.
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T: +31 (0) 499 33 69 69
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