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authorAntonino A. Daplas <adaplas@gmail.com>2005-07-29 14:03:31 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-29 15:01:13 -0700
commit80625942094b114d85811e5ff1fbc9e06dabe0ff (patch)
tree66c6e49c4a24d7338d4510be449e4cc17dc95e29 /arch/i386/kernel
parent655a0a7799cddf9a469916c07ac22f1106abc2be (diff)
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[PATCH] vesafb: Fix mtrr bugs
>> vesafb: mode is 800x600x16, linelength=1600, pages=16 >> vesafb: scrolling: redraw >> vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0 >> mtrr: type mismatch for fc000000,1000000 old: write-back new: write- >> combining Range is already set to write-back, vesafb attempts to add a write-combining mtrr (default for vesafb). >> mtrr: size and base must be multiples of 4 kiB This is a bug, vesafb attempts to add a size < PAGE_SIZE triggering the messages below. To eliminate the warning messages, you can add the option mtrr:2 to add a write-back mtrr for vesafb. Or just use nomtrr option. 1. Fix algorithm for finding the best power of 2 size with mtrr_add(). 2. Add option to choose the mtrr type by extending the mtrr boot option: mtrr:n where n 0 = no mtrr (equivalent to using the nomtrr option) 1 = uncachable 2 = write back 3 = write combining (default) 4 = write through Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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