[SeaBIOS] BEV and bootorder

Gleb Natapov gleb at redhat.com
Sun Apr 15 08:57:46 CEST 2012

On Sat, Apr 14, 2012 at 11:19:31PM -0400, Kevin O'Connor wrote:
> On Thu, Apr 12, 2012 at 01:30:36PM -0600, Steve Goodrich wrote:
> > I'm working towards a goal of having specific devices be bootable, and
> > *only* those devices.  For example, if my bootorder file specifies SATA
> > drive 3, I do not want it to try SATA drives 0, 1, and 2, nor any other HDD
> > or floppy that it finds.
> > 
> > My first question is: how do I do this?
> There is no current way to do this.  I suppose one could code support
> for a "stop boot" option to the boot order file - so that if it was
> listed in the file the boot would stop after trying all options prior
> to it.
I thought to add skipboot file. If device is in skipboot file it is not
considered for booting from.

> > If that can't be answered, can someone explain to me the relationship
> > between the bootorder file and the BEV (Boot Execution Vector) configured in
> > boot.c?
> All possible boot options (both BEV and BCV) are assembled in a sorted
> list pointed to by boot.c:BootList.  The bootorder file alters the
> default sort order of that list.  During the latter parts of the POST
> phase, the BCVs are executed and only BEVs remain.  The list of BEVs
> is generated from the BootList.  So, in a nutshell, the bootorder file
> determines the order of the BEVs that SeaBIOS will attempt to boot
> from.
> -Kevin
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