From mboxrd@z Thu Jan  1 00:00:00 1970
From: B.R. Oake <broake@openmailbox.org>
Date: Tue, 06 Jan 2015 17:01:14 +0000
Subject: [U-Boot] u-boot on raspberry pi with fw_printenv/fw_setenv
In-Reply-To: <20150106120848.GH5040@waldemar-brodkorb.de>
References: <20150106120848.GH5040@waldemar-brodkorb.de>
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To: u-boot@lists.denx.de

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,
B.R.