kernel params passed by OF/cmdline/"append="

Tony Breeds tony at
Tue Oct 25 12:05:52 EST 2011

On Mon, Oct 24, 2011 at 09:32:51PM +0800, Ryan Wang wrote:

> I still have another 2 questions:
>        1) Where does boot-file come in effect?
>            E.g. I run 'setenv boot-file xmon=on' in the openfirmware, can
> the vmlinux booted
>            by yaboot get the arg 'xmon=on'?

No.  Those arguments would be consumed by yaboot and they're not passed
onto the booted kernel.  Best to add them to the append line in your
config file.

>         2) What's the relationship between boot-file and bootargs?

This can be a little tricky to tease out but basically

boot-file are the args used to boot but /chosen/bootargs are the
arguments passed to the last boot command.  Some OF (all?) may also
include bootargs when autobooting but I'd nee to confirm that.

Yours Tony
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