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aperture_64.c: clarify that too small aperture is valid reason for this code

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Impact: update comment

Clarify that too small aperture is valid reason for this code.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Pavel Machek 2008-11-26 17:15:27 +01:00 committed by Ingo Molnar
parent 1d9b16d169
commit 8caac56305
1 changed files with 3 additions and 2 deletions
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arch/x86/kernel/aperture_64.c
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@ -1,8 +1,9 @@
/*
* Firmware replacement code.
*
* Work around broken BIOSes that don't set an aperture or only set the
* aperture in the AGP bridge.
* Work around broken BIOSes that don't set an aperture, only set the
* aperture in the AGP bridge, or set too small aperture.
*
* If all fails map the aperture over some low memory. This is cheaper than
* doing bounce buffering. The memory is lost. This is done at early boot
* because only the bootmem allocator can allocate 32+MB.