[coreboot] [PATCH]Improve YABEL compatibility
phueper at hueper.net
Fri Jan 14 11:13:07 CET 2011
Looks great to me...
Acked-by: Pattrick Hueper <phueper at hueper.net>
On Thu, Jan 13, 2011 at 12:00 PM, Joseph Smith <joe at settoplinux.org> wrote:
> On Thu, 13 Jan 2011 11:05:55 +0100, Patrick Georgi
> <Patrick.Georgi at secunet.com> wrote:
>> 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
> coreboot mailing list: coreboot at coreboot.org
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