Re: [Buildroot] [PATCH 2/2] configs/rock5b_defconfig: enable uboot-env on the SD card

[Niklas Cassel via buildroot <buildroot@buildroot.org>]

On Thu, Oct 03, 2024 at 03:45:13PM +0200, Niklas Cassel wrote:
> 
> Second approach:
> 
> I tried to create an empty partition:
> 	partition uboot-env {
> 		offset = 16M
> 		size = 64K
> 	}
> 
> Then I can see that uboot uses the default environment:
> Loading Environment from MMC... *** Warning - bad CRC, using default environment
> 
> However, it then continues trying to PXE boot.
> 
> It doesn't try to boot using extlinux from mmc partition 2.
> 
> Looking at why, it seems that it doesn't even find the boot flow.
> 
> 
> $ bootflow scan mmc
> $ bootflow list
> <nothing>
> 
> If I don't have the uboot-env partition:
> 
> $ bootflow scan mmc
> $ bootflow list
> Showing all bootflows
> Seq  Method       State   Uclass    Part  Name                      Filename
> ---  -----------  ------  --------  ----  ------------------------  ----------------
>   0  extlinux     ready   mmc          1  mmc@fe2c0000.bootdev.part /boot/extlinux/extlinux.conf
> ---  -----------  ------  --------  ----  ------------------------  ----------------
> (1 bootflow, 1 valid)
> 
> 
> So for some reason, bootflow does not find the extlinux if it is not on
> partition 1... I've looked at the bootflow code in uboot, an it appears
> to be able to scan multiple partitions on a device, so I'm not sure why
> it is not working.

I found out why uboot bootflow scan did not find this partition:
The partition was not marked bootable.

Apparently uboot doesn't care about the partition being marked bootable
if it is the first partition, but if it is not on the first partition,
it has to be marked bootable.

Will submit a V2 with this approach, as it is much cleaner.


Kind regards,
Niklas
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