Aw: extend environment with file

Frank Wunderlich frank-w at
Tue Dec 21 19:01:13 CET 2021


as far as i have debugged it:

distroboot (include/config_distro_bootcmd.h) lands in BOOTENV

magic is in include/env_default.h where at least CONFIG_EXTRA_ENV_SETTINGS is only mapped
if CONFIG_USE_DEFAULT_ENV_FILE is not set, if set a generated headerfile generated/defaultenv_autogenerated.h
is included which contains some magic numbers (i guess hex-values of the chars from the file). this seems to
be generated in main Makefile, but i'm not sure how exactly (anyhow with tools/env/).

any idea to concatenate both sources?

regards Frank

> Gesendet: Dienstag, 21. Dezember 2021 um 13:56 Uhr
> Von: "Frank Wunderlich" <frank-w at>
> An: "U-Boot Mailing List" <u-boot at>
> Betreff: extend environment with file
> Hi,
> currently i use distroboot on my board which sets some environment-variables, some other (memory addresses) were set in my soc-specific header file (include/configs/rk3568_common.h).
> But distroboot is a bit too limited for my needs (no tftp, no script, ...), so imho i need to use the bootmenu way here, but for local kernel-bootup run distro_bootcmd.
> I want to add some more variables (e.g. for bootmenu) and for easier maintaining i used a txt-file for it and defined
> CONFIG_DEFAULT_ENV_FILE="uEnv_r2pro.txt"
> but this option seems to clear the previous environment from distroboot and soc header file...i have now only the vars from the file defined.
> i tried adding CONFIG_ENV_APPEND=y but i have still only the vars from the file.
> Is there a way to append (distrocmd + soc-header + uenv-file) instead of overwriting?
> regards Frank

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