Re: [meta-rauc] Queries about rauc

["Enrico Jörns" <ejo@pengutronix.de>]

Hi Llewellyn,

Am 10.12.19 um 19:07 schrieb Llewellyn Fernandes:
> Hi,
> 
> I am a system engineer in Evologics Gmbh and we are planning to
> integrate rauc in our marine robotics products for ease of update .

ouh, that sounds like a really interesting application for RAUC!

> I have a query regarding the update process
> We have a board based on imx6 with emmc flash .
> I have created symmetric A B partitioning .
> 
> Kernel + dtb partition 1
> Rootfs.         Partition 2
> Kernel + dtb partition 3
> Rootfs.         Partition 4
> 
> I have managed to create the bundle for this .
> 
> My question is since there are 2 files ie kernel and dtb in one
> partition will this create a problem while installing the 2nd file .
> Does it format the partition and then install each file ?

As RAUC aims to perform 'image' updates, the straight solution to your
use case would be to provide a file system image containing both the
kernel and the dtb.
This should simply be possible by splitting up rootfs using wic or
genimage tool in a Yocto file system image recipe.

The other (quite similar similar) option would be to provide the two
files in a tar archive.  Then RAUC will perform file system creation and
unpacking of that tar. From the integration point of view this should
only differ from the first case in sense of image type.


Going a step backwards I would like to ask if there is really a need for
having the rootfs and the kernel being separate. With bootloader
supporting freescale boot spec files (such as barebox does), you can
easily store both the dtb and the kernel in the rootfs and the boot spec
file will tell the loader where to find it. This also potentially
enables you having the same rootfs for different machines/dtbs.


RAUC itself is currently not designed to install multiple individual
files to a slot.


Does that already help you a little?


Best regards, Enrico


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