[coreboot] [PATCH] SeaBIOS VGA hooks

Stefan Reinauer stefan.reinauer at coresystems.de
Wed Jun 9 20:34:45 CEST 2010

On 6/9/10 8:00 PM, Myles Watson wrote:
> On Wed, Jun 9, 2010 at 1:45 AM, Stefan Reinauer
> <stefan.reinauer at coresystems.de> wrote:
>> SeaBIOS VGA hooks for Getac P470 and Roda RK886EX notebooks
> It seems surprising to want to make SeaBIOS have this much stuff
> that's board-specific. 
int15 hooks are designed to be board specific.

>  It seems like a more generic way to set hooks
> from CBFS would be nice.
Loading an int handler dynamically from CBFS and linking it at runtime?
Sounds doable but complex.
As long as it's only 2 intel and a number of VIA based boards that
require a special int15 handler it might not be that bad.

Generally it's also possible to locally patch the SeaBIOS source code.
The runtime distinction is only required if you want to use the same
SeaBIOS binary on several mainboards that require to have different
int15 handlers.

> I'm thinking something like seabios/hooks which has a list of
> interrupts handlers and where they should be installed.
It would need to be 0xe0000 - 0xfffff unless we want to start cutting
out more memory.
Alternatively we could add an SMI "function call" to coreboot that does
the deed. That would simplify the code in SeaBIOS significantly but add
more requirements for SMM.


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