[yocto] [rauc] create a rescue image
patrick.boettcher at posteo.de
Mon Mar 25 09:21:33 PDT 2019
On Mon, 25 Mar 2019 16:01:37 +0100
jairo <jairo at futurasmus-knxlab.es> wrote:
> Hi all,
> I want to make a system with a rescue partition.
> What is the minimum to make a rescue image? Or how can it be done?
> I use a board with a imx6 micro from phytec, and in the meta-yogurt
> layer there is a recipe called phytec-initramfs-image.bb that creates
> an image or partition with cpio.gz format of 11MB containing rootfs,
> can it be used That image as a rescue? If so, how do you copy a cpio
> partition in an UBI MTD system?
To create an initramfs rescue image (assuming that's what you would
want to do?) You need to tell yocto that there is a initramfs to be
To your local.conf you can add
# for initramfs-usage
INITRAMFS_IMAGE = "rescue-image-initramfs"
INITRAMFS_IMAGE_BUNDLE = "1"
and you'll to craete a corresponding .bb-file. There are example over
the internet if you search for it. I needed the following packages:
PACKAGE_INSTALL = "packagegroup-core-boot \
This gave me a initramfs of 25-30 MB and barebox wasnot able to
jump to the kernel so I had to patch.
After that you just need to add a partition for the initramfs and its
device-tree-blob (dtb) to the UBIFS and flash it and boot it.
You should, if you haven't already, come up with a complete strategy of
how to do your updates and upgrades using RAUC or another update-system.
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