[coreboot] SimNOW VGA int 1a

[Myles Watson]

On Thu, Oct 16, 2008 at 1:27 PM, Myles Watson <mylesgw at gmail.com> wrote:

>
>
> On Thu, Oct 16, 2008 at 1:25 PM, ron minnich <rminnich at gmail.com> wrote:
>
>> On Thu, Oct 16, 2008 at 12:19 PM, Marc Jones <marc.jones at amd.com> wrote:
>>
>> > AH! I see. We shouldn't be running out of the ROM. That will be slow. We
>> > should copy the VGA BIOS to real memory and run it there.
>> >
>> > Why are you doing ROM init in stage0? I thought this was well into
>> stage2.
>> >
>>
>> So, safety tip: we can't call ANY ROM in stage2 when we're running
>> doing ROM init.
>>
>> And I just realized the problem: we're calling printk and printk is in
>> ROM.
>>
>> no printks allowed in pcibios.c unless we move printk to RAM, i.e.
>> compile printk into stage2.
>>
>> What a revolting development this is! Our beautiful "common code in
>> ROM" idea is going down in flames.
>>
>
Wait a second.  The reason this is broken is that the code setting the PCI
decode register is in the ROM.  Can we fix this by calling
pci_conf1_write_config32 instead?  It looks like it's in RAM.

Myles
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