x86: checking aperture size order

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some systems are using 32M for gart and agp when memory is less than 4G.
Kernel will reject and try to allcate another 64M that is not needed,
and we will waste 64M of perfectly good RAM.

this patch adds a workaround by checking aper_base/order between NB and
agp bridge. If they are the same, and memory size is less than 4G, it
will allow it.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

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Yinghai Lu 2008-04-13 18:42:31 -07:00 • committed by Ingo Molnar

parent 1edc1ab3f6

commit 8c9fd91a0d

2 changed files with 41 additions and 18 deletions

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47

arch/x86/kernel/aperture_64.c

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12

drivers/char/agp/amd64-agp.c

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