Re: how to persistently save config values

[Giorgio Dal Molin <giorgio.nicole@arcor.de>]

Hi Sascha,

thank you for the answer.

I just experimented a bit with the environment and the nv vars
and I think I'll go this way.

I was a bit surprised by the saveenv command though: my understanding
of the (default) environment was that it was a read only blob
hardcoded in the barebox image; I thought if I want some new/dynamic
env content to be saved for the next reboot I have to explicitly provide
a storage disk/cf/mtd partition to the saveenv and then to the loadenv.
Instead, just saying 'saveenv' saves the contents of '/env' 'somewhere'
from where it can be restored on next reboot (very good!).

Together with the nv vars and the 'nv.dev.' prefix this just does the
trick for me.

Thank you.

giorgio

> On September 29, 2017 at 1:35 PM Sascha Hauer wrote:
> 
> On Fri, Sep 29, 2017 at 10:25:03AM +0200, Giorgio Dal Molin wrote:
> > Hi,
> > 
> > I'm working on a new project with an embedded system based on
> > a standard intel PC.
> > 
> > I already have a barebox.efi running on the system; my problem is now
> > how to permanently save some variables so that, on restart, they can be
> > automatically restored by my '/env/bin/init' script.
> > The variables I mean are for example 'eth0.ipaddr' or 'eth0.serveraddr'.
> > A solution I used in the past was a custom 'env_dump' command that generated
> > a config text file like:
> > 
> > eth0.ipaddr=10.0.0.15
> > eth0.serveraddr=10.0.0.1
> 
> (should be eth0.serverip)
> > ...
> > 
> > Then I saved the file with 'saveenv' and restored it back with 'loadenv'.
> 
> Normally you should edit /env/network/eth0 to change the network config.
> 
> Also there is the possibility to create a nv variable that automatically
> mirrors to the device variable. In this case it would be
> nv.dev.eth0.ipaddr and nv.dev.eth0.serverip. This doesn't work with dhcp
> though.
> 
> Sascha
> 
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