[coreboot] [PATCH]Improve YABEL compatibility

Joseph Smith joe at settoplinux.org
Thu Jan 13 12:00:27 CET 2011

On Thu, 13 Jan 2011 11:05:55 +0100, Patrick Georgi
<Patrick.Georgi at secunet.com> wrote:
> Hi,
> attached patch improves compatibility of YABEL with realmode execution
> of the VGA BIOS by passing through access to IVT, BDA and option ROM
> area directly, instead of copying them from the emulated memory to real
> memory after initialization is done.
> Some VGA BIOSes seem to map hardware registers into the option ROM area,
> so routing accesses to these into emulated RAM will lead to all kinds of
> unexpected behaviour.
> The intent of YABEL in coreboot is to provide improved security by
> isolating hardware access - this patch doesn't improve or degrade
> security as the memory regions in question were already copied back
> after emulation before this patch.
> Signed-off-by: Patrick Georgi <patrick.georgi at secunet.com>

Nice work!

Acked-by: Joseph Smith <joe at settoplinux.org>

Joseph Smith

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