Searching and Finding boot.scr and uboot.env on a Raspberry Pi 4

[Marc Haber]

Hi Quentin,

thanks for answering. I really appreciate that.

On Tue, Jun 10, 2025 at 12:36:23PM +0200, Quentin Schulz wrote:
>On Theobroma boards (Rockchip-based), we force the environment to be 
>coming from the same storage medium as U-Boot proper, c.f. 
>board/theobroma-systems/common/common.c:arch_env_get_location()
>
>This is the location of the U-Boot environment in raw, not in a 
>filesystem, so this won't apply to your use-case.

Sadly ;-)

>But quickly looking at env/fat.c which makes use of the 
>CONFIG_ENV_FAT* variables from above, it seems like you should be able 
>to override env_fat_get_intf and env_fat_get_dev_part from a board 
>file and implement what you want there, provided U-Boot (and/or the 
>RPi firmware) provides you with the information from where it was 
>booted.

Can I get u-boot to somehow log where it is looking for files? That way 
I wouldn't have to guess where to put a board file.

>If you don't want to change the U-Boot binary and somehow you can have 
>a minimal environment to run a few commands, you could probably erase 
>the whole environment and re-import it manually with `env import`?

As far as I have understood, if u-boot finds neither its environment 
file or a boot.scr (that one comes from the environment as well, right?) 
it just sits there doing nothing. It's that first step that I don't 
understand.

If a change can be made while keeping backwards compatibility, I figure 
I can talk to the u-boot maintainer of Debian, or rebuild the 
u-boot-raspi package myself as a last resort. I just don't have a clue 
(yet) what and where to touch. I am still on the lower end of my u-boot 
learning curve.

Greetings
Marc

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