barebox environment raw partition on beaglebone black

[Lars Pedersen]

Hi Ahmad

On Thu, 15 Feb 2024 at 14:47, Ahmad Fatoum <a.fatoum at pengutronix.de> wrote:
>
> Hi Lars,
>
> On 15.02.24 14:01, Lars Pedersen wrote:
> > Hi.
> >
> > I'm trying to create a barebox environment by using af emmc a raw
> > partition offset on the beaglebone black.
> >
> > For testing I appended the following into am33x-boneblack.dts.
> >
> > / {
> >     chosen {
> >         environment {
> >             compatible = "barebox,environment";
> >             device-path = &environment_emmc;
> >         };
> >     };
> >
> >     aliases {
> >         state = &state_emmc;
> >     };
> >
> >     state_emmc: state {
>
> [snip]
>
> Keep in mind that state is unrelated to environment:
>
>  - state: power-fail safe set of predefined variables used for mostly bootstate
>  - environment: where you would keep scripts, variables and resources.
>     In the field, you'd probably only use the immutable barebox built-in environment
>     (+ state), but for development, the mutable environment is very handy.
>
> > state: New state registered 'state'
> > state state.of: Fresh state detected, continuing with defaults
>
> State looks ok.
>
> > environment load /mnt/mmc1.0/barebox.env: No such file or directory
> > Maybe you have to create the partition.
> > changing USB current limit to 1300 mA... done
> >
> > Hit m for menu or any to stop autoboot:    1
> > ---------------------------------------------------
> >
> > Why does it try to read the env on a partition on
> > /mnt/mmc1.0/barebox.env? Is it because barebox.bin also is read from
> > this partition?
>
> Check out omap_env_init(), which registers the environment if system boots from
> SD/MMC. This seems to take precedence over what's in the device tree. Indeed,
> upstream AM335x platforms only configure an environment in the DT if it's outside
> SD, on NAND or NOR.
>
> I think placing the environment on the FAT makes sense as the MLO is there as well.
> Why would you like to move it?

I'll check out the omap_env_init. I just trying to understand how it
was set, so I don't want to change anything :)

Thanks for the quick response.

/Lars

>
> Cheers,
> Ahmad
>
> >
> > Thanks.
> >
> > /Lars
> >
> >
>
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