barebox environment early loading

barebox environment early loading

[Dusan Radic]

Hello there,

is there a possibility  to read an environment variable as soon as in
ipufb.c?
To be more accurate, before the frame buffer is initalised I need set
the bus_format manually and the correct value is stored in a non
volatile environment variable.
I have tried the following

const char* value;

value = getenv("nv.dataval");

However the result is always NULL.

If I try the same somewhere in board.c then I get the correct value,
but that ist too late to configure the frame buffer.

Has anyone managed to read the environment early, and if yes how? Do I
have to somehow manually load the environment path?  I have tried this
default_environment_path_set(default_environment_path); but it doesn't
seem to work.

I am using barebox 2017.12.0

Help would be appreciated.
Best regards,
Dule

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Re: barebox environment early loading

[Oleksij Rempel]

Hello Dusan,

Am 09.09.21 um 13:58 schrieb Dusan Radic:
> Hello there,
>
> is there a possibility  to read an environment variable as soon as in
> ipufb.c?
> To be more accurate, before the frame buffer is initalised I need set
> the bus_format manually and the correct value is stored in a non
> volatile environment variable.
> I have tried the following
>
> const char* value;
>
> value = getenv("nv.dataval");
>
> However the result is always NULL.
>
> If I try the same somewhere in board.c then I get the correct value,
> but that ist too late to configure the frame buffer.
>
> Has anyone managed to read the environment early, and if yes how? Do I
> have to somehow manually load the environment path?  I have tried this
> default_environment_path_set(default_environment_path); but it doesn't
> seem to work.
>
> I am using barebox 2017.12.0

uii... drop it, it stinks :D

First of all, update it to the latest version - 2021.08.0 or even next.
Then port the board code to the DEEP_PROBE.
Grep for BAREBOX_DEEP_PROBE_ENABLE. Then you will probably need
something like of_device_ensure_probed() to ensure your environment
storage is probed.

There are probably some more challenges, but this are initial steps.

--
Regards,
Oleksij

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