[coreboot] [PATCH] VIA C7 CAR fixes / cleanup

Stefan Reinauer stepan at coresystems.de
Mon Apr 12 17:20:46 CEST 2010

> Am 12.04.2010 15:39, schrieb Kevin O'Connor:
>> On Mon, Apr 12, 2010 at 11:56:45AM +0200, Patrick Georgi wrote:
>>> Am 12.04.2010 06:41, schrieb Kevin O'Connor:
>>>> Indeed, the time to "Stage:..." is faster than romcc now.  Just need
>>>> to fix that delay after "Stage:"..
>>> Your other mail seems to indicate that this is because of the stack at 64MB.
>> That's my guess - I'll try and confirm tonight.
>>> If we:
>>> - Move the intermediate stack to wherever the ramstage stack resides
>>> (somewhere close to RAMTOP),
>>> - change the stage loaders (copy and ulzma) to leave out %esp..RAMTOP
>>> (with some safety margin below %esp), which should always be "0" anyway, and
>>> - enable caching for RAMBASE..RAMTOP (already done, I think)
>> I didn't understand the first two points.  The third point makes sense
> It seems that the stack is usually close to RAMTOP. We'd have to make
> sure that it's at a deterministic position (ie. == RAMTOP) and avoid
> overwriting that stack on decompression, then we could reuse the
> ramstage stack location for uncompression.
> Most boards have RAMBASE at 1MB (or 2MB in some cases). RAMBASE at 16K
> is only left for a couple of boards that rely on their own vgabios handling.
> Two things "should" happen (if someone with the board finds the time):
> 1. removal of the custom vgabios handling, using oprom instead
1.5. do the same thing for vsmsetup.c
> 2. moving RAMBASE to 1MB

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