[SeaBIOS] Non-PNP legacy option rom scan and init

[Kevin O'Connor]

On Sun, May 08, 2011 at 09:27:37PM +0200, Sebastian Herbszt wrote:
> Kevin O'Connor wrote:
> >We want the boot menu to be able to configure which drive becomes the
> >C: drive, so the boot menu must be displayed prior to running the BCVs
> >and Legacy Option ROMs.
> 
> So this is more a BCV than IPL menu. Maybe the F12 message should be
> renamed?

The menu shows both BCVs and IPLs.

> >All BCVs and legacy option roms are always called.  The only thing the
> >boot menu does is determine the order of their invocation.  (See
> >boot.c:boot_prep().)  If you have a counter-example then it is a bug
> >and must be fixed.
> 
> This is not intuitive because other BIOSes display a boot menu after
> all BCV and legacy roms were called.

I've seen multiple machines with a boot menu that allows one to select
a drive to boot from.  It's not uncommon - plug in a USB drive, and
the boot menu will allow you to boot from it.

-Kevin