[SeaBIOS] BEV and bootorder

[Fred .]

2012/4/15 Gleb Natapov <gleb at redhat.com>:
> On Sun, Apr 15, 2012 at 02:24:05PM +0200, Fred . wrote:
>> Why would anyone want to define some devices as unbootable?
>>
> Because he does not want to boot from them.

Then the partition should not be flagged as a boot partition, and it
won't be booted from.
Then it proceeds to try to boot from the next device.
>
>> On Sun, Apr 15, 2012 at 8:57 AM, Gleb Natapov <gleb at redhat.com> wrote:
>> > 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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>> >
>> > --
>> >                        Gleb.
>> >
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>
> --
>                        Gleb.