[coreboot] CBFS searches in Coreboot and SeaBIOS

Myles Watson mylesgw at gmail.com
Fri Sep 25 20:04:38 CEST 2009

On Fri, Sep 25, 2009 at 11:57 AM, Stefan Reinauer <stepan at coresystems.de>wrote:

> Myles Watson wrote:
> >> What about we stop the spew rather than changing the algorithm?
> >>
> > I think both need to be done.  On a mainboard with many devices it
> > seems silly to keep looking through the same two CBFS entries for
> > ROMs.  Is there a reason to do it that way that I'm missing?
> >
> Well, it's quite against the device centric model we have at the
> moment... That made me hesitate.
That's a valid point.  Now I wonder how it could be implemented so that we
get the precedence of CBFS then ROM if it exists correct, so that only one
gets executed.

> But your reasons are very sound. It's quite a lot of cbfs accesses, and
> generally I guess walking the device tree (in coreboot it's even a
> memory op, and not a pci config space op) is cheaper than walking all of
> the rom all of the time..

It's not a show-stopper for me, but I thought I'd bring it up when I came to

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