RE: Running with VGA

[YhLu]

Then Eric need to fix the MTRR for AMD...?

-----Original Message-----
From: Li-Ta Lo [mailto:[e-mail]] 
Sent: Friday, January 14, 2005 6:58 AM
To: YhLu
Cc: Sagiv Yefet; LinuxBIOS
Subject: RE: Running with VGA

On Thu, 2005-01-13 at 22:20, YhLu wrote:
> The problem is no body touch that range. Even init_ecc_memory will skip

the
> first 1M range.

No. The problem is amd/early_mtrr and amd/mtrr are wrong. The 
amd/early_mtrr does not enable MEM forwarding of A0000-BFFFF to
main memory and amd/mtrr is called to late (it doesn't check if
A0000-BFFFF should be forward to IO or MEM neither).

I fixed it a long time ago. Eric's CPU code just wipe them out.

Ollie

Running with VGA

[Li-Ta Lo]

On Fri, 2005-01-14 at 10:36, YhLu wrote:
> Then Eric need to fix the MTRR for AMD...?

He uses TOP_MEM instead of MTRR for caching
in early_mtrr. I don't know how to fix this
execpt rewrite the whole early_mtrr.

Probably we should add a dev_post() pass
and put the ROM post into device_op::post?

Ollie
> -----Original Message-----
> From: Li-Ta Lo [mailto:[e-mail]] 
> Sent: Friday, January 14, 2005 6:58 AM
> To: YhLu
> Cc: Sagiv Yefet; LinuxBIOS
> Subject: RE: Running with VGA
>
> On Thu, 2005-01-13 at 22:20, YhLu wrote:
> > The problem is no body touch that range. Even init_ecc_memory will skip
>
> the
> > first 1M range.
>
> No. The problem is amd/early_mtrr and amd/mtrr are wrong. The 
> amd/early_mtrr does not enable MEM forwarding of A0000-BFFFF to
> main memory and amd/mtrr is called to late (it doesn't check if
> A0000-BFFFF should be forward to IO or MEM neither).
>
> I fixed it a long time ago. Eric's CPU code just wipe them out.
>
> Ollie