Hi, B.R. Oake wrote,

On 06/01/15 12:08, Waldemar Brodkorb wrote:

...

I am looking for a way to change u-boot environment from Linux on a Raspberry PI. I have fw_printenv/fw_setenv, but I have no clue how the config file looks like, when using uboot.env as a file on the first vfat partition. I am not sure, but it looks like there is no code to use fw_printenv/fw_setenv with files.

Hi Waldemar,

fw_printenv and fw_setenv can act on an ordinary file instead of a device if you want; their config file is normally /etc/fw_env.config . So for example, first you could create an empty 16K file uboot.env:

dd if=/dev/zero of=uboot.env bs=1K count=16

then you could configure fw_printenv and fw_setenv to act upon that file by putting the following line in /etc/fw_env.config:

uboot.env 0x0000 0x4000 0x4000

I hope that helps,

Thanks a lot! This helps. Maybe an additional example in fw_env.config would avoid another question about this in the future ;)

BTW: I needed a small path to let fw_printenv compiled: --- u-boot-d8bec60c1b0de7770f9b56ad092ab9be801d99af.orig/tools/env/fw_env.h 2015-01-06 09:00:23.000000000 +0100 +++ u-boot-d8bec60c1b0de7770f9b56ad092ab9be801d99af/tools/env/fw_env.h 2015-01-07 13:13:44.399072426 +0100 @@ -14,6 +14,8 @@ #include <config.h> #endif

+#include <generated/autoconf.h> + /* * To build the utility with the static configuration * comment out the next line.

Otherwise compile breaks: HOSTCC tools/env/fw_env.o In file included from tools/env/fw_env.c:117:0: include/env_default.h:110:11: error: expected '}' before 'CONFIG_SYS_ARCH' "arch=" CONFIG_SYS_ARCH "\0" ^ make[4]: *** [tools/env/fw_env.o] Error 1

best regards Waldemar