On Wed, Apr 16, 2008 at 5:03 PM, joe@settoplinux.org wrote:
Hello, I am noticing some X problems (slow, crashes once and a while) on the RCA
RM4100. I think this is related to the crazy way coreboot setup the mtrr. For some reason when the Intel onboard graphics are enabled, coreboot sets up this crazy looking mtrr. I don't think they should all be write-back? Isn't write-combining faster for graphics? Does it need to have a uncachable area?
that is normal.
reg00: base=0x00000000 ( 0MB), size= 64MB: write-back, count=1 reg01: base=0x04000000 ( 64MB), size= 32MB: write-back, count=1 reg02: base=0x06000000 ( 96MB), size= 16MB: write-back, count=1 reg03: base=0x07000000 ( 112MB), size= 8MB: write-back, count=1
==
reg00: base=0x07800000 ( 120MB), size= 8MB: uncachable, count=1 reg01: base=0x00000000 ( 0MB), size= 128MB: write-back, count=1
and old kernel like previous one 64+32+16+8 == (128 - 8)
YH
Hmm, so it all adds up but, what is the need for 3 different mtrr's instead of one? Also, what about this:
I don't think they should all be write-back? Isn't write-combining faster for graphics? Does it need to have a uncachable area?