Modifying Barebox variables from Linux

Sascha Hauer s.hauer at pengutronix.de

Mon Feb 2 23:38:41 PST 2015

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On Mon, Feb 02, 2015 at 09:20:18PM +0000, Boulais, Marc-Andre wrote:

> Hi,

> I am working on an Phytec Phycore-OMAP4460 platform with a Linux BSP (provided by Phytec) which uses Barebox 2013.1.0 to boot the OMAP4. Our application previously ran in a Linux system where U-Boot was used. We could change U-boot variables from the Linux command line as follows:

>> fw_setenv bootargs 'mem=512M console=ttyS0,115200n8 noinitrd root=/dev/mtdblock4 ro rootfstype=yaffs2'

>> How would I go doing the same with Barebox ? Is bareboxenv-target part of the solution ?

Yes.

On the target do:

bareboxenv -l /tmp/env /dev/mtdblockx

... modify stuff in /tmp/env ...

bareboxenv -s /tmp/env /dev/mtdblockx

Note that with a newer barebox (v2015.01.0) barebox has nonvolatile

variables that are stored in the environment. With that changing

variables is a matter of doing:

echo "mybootargs" > /tmp/env/nv/linux.bootargs.mine

With your older barebox the variables are created in scripts which means

you have to modify scripts from other scripts, or you would have to add

something like "source /env/vars/*" to a barebox startup script.

Sascha

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