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This commit adds support for updating the system using swupdate, using
a dual root filesystem scheme:
- genimage.cfg is updated to add another root filesystem partition,
to implement the dual copy scheme
- sw-description is the swupdate image description file, that will be
part of the swupdate update file
- postupdate.sh is the shell script that will be executed on the
target once the upgrade has completed successfully.
- gen-swupdate-image.sh is the shell script executed on the build
machine at the end of the Buildroot build to generate the swupdate
update file
- extlinux.conf is updated so that the root= kernel argument is
properly adjusted depending on which partition we are booting on
- stm32mp15_dk_defconfig is updated with swupdate, the sgdisk tool
from gptfdisk, and to call the gen-swupdate-image.sh script as a
post-image script.
- the kernel configuration is updated with additional options for USB
mass storage support
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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