[U-Boot-Users] Using 'ver' env var
Wolfgang Denk
wd at denx.de
Tue Aug 14 17:23:43 CEST 2007
In message <1187102431.13869.7.camel at elrond.sweden.atmel.com> you wrote:
>
> Ideally this should be in a script "reboot_cmd" which
> gets executed at every reboot before anything else
> is executed.
I really don't understand why you make all this so complicated.
I think we agree that all that needs to be done is running a single
"saveenv" command once after installation of a new U-Boot image (which
is supposed to never to happen in the field anyway).
So deine yoiur "bootcmd" to include something like a "run once"
command, and define "once" as a "harmless" operation, like this:
=> setenv once version
Then, when you update U-Boot (under Linux), also change the definition
of "once", equivalent to this:
=> setenv once "saveenv;setenv once version"
The next time U-Boot boots it will run this variable, will save the
environment and then reset the variable to the effective no-op
command.
Voila...
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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