Re: imx8mm & genimage

[Alexander Shiyan <eagle.alexander923@gmail.com>]

Hello Ahmad.

"in-partition-table = false" helps me, now boot OK.
33K is valid offset for imx8mm, and we do not overlap GPT (or MBR) due
to the "holes" option.

Thanks!

ср, 30 авг. 2023 г. в 17:25, Ahmad Fatoum <a.fatoum@pengutronix.de>:
>
> Hello Alexander,
>
> On 30.08.23 16:02, Alexander Shiyan wrote:
> > Hello.
> >
> > I can't figure out how to correctly write the configuration for
> > genimage for the imx8mm CPU.
> > This way of writing works fine:
> > dd if=barebox-nxp-imx8mm-mgqs.img of=/dev/sdc bs=1024 seek=33 skip=33
> >
> > For genimage I use the following but it doesn't work...
>
> What doesn't work? I would have assumed that genimage refused to build
> an image with below description.
>
> >
> > image imx8mm-mgqs-sdcard.img {
> > hdimage {
> > partition-table-type = "gpt"
> > }
> >
> > partition boot {
> > image = "barebox-nxp-imx8mm-mgqs.img"
> > holes = {"(0; 33K)"}
> > offset = 0
> > partition-type-uuid = 0fc63daf-8483-4772-8e79-3d69d8477de4
>
> I don't think a GPT partition can exist at offset 0, because that would
> overlap the GPT header itself. What you want instead is either:
>
>   - add barebox in non-partitioned space outside of the partition table:
>     That is done with in-partition-table = false, see e.g. DistroKit[1]
>
>   - add barebox in a GPT partition at the correct offset (32K?) and strip away
>     its first 32K bytes. The only way to achieve this currently with genimage
>     is to add an explicit file rule and use
>     exec-post = "dd ... of=$IMAGEOUTFILE.skipped && mv $IMAGEOUTFILE.skipped $IMAGEOUTFILE"
>     It would surely be nice to give genimage a partition { skip = [...] } option,
>     if you feel inclined :-)
>
> For eMMC, the barebox update handler will take care to switch on the
> eMMC boot and install barebox and do any skipping of bytes if necessary (e.g. on i.MX8MN/P).
>
> [1]: https://git.pengutronix.de/cgit/DistroKit/tree/configs/platform-v8a/config/images/imx8m.config?h=next&id=d4e41181cc388d528bbccb5e9ba96a6120980a55
>
> Cheers,
> Ahmad
>
>
> > }
> >
> > partition env {
> > image = "/dev/null"
> > offset = 8M
> > partition-type-uuid = 6c3737f2-07f8-45d1-ad45-15d260aab24d
> > size = 32K
> > }
> >
> > partition root {
> > image = "rootfs.ext4"
> > partition-type-uuid = b921b045-1df0-41c3-af44-4c6f280d3fae
> > }
> > }
> >
> >
>
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