Messages in this thread | | | Subject | mtrr failure, 3.1-rc1 | Date | Thu, 25 Aug 2011 09:03:35 +0200 | From | Anders Eriksson <> |
| |
My old P-II has 640MB ram, but the bios only sets up WC for the first 512, so i add this early in the boot process: echo "base=0x20000000 size=0x8000000 type=write-back" > /proc/mtrr
For reasons I have forgot I also have to add 'disable_mtrr_check' to the command line. Works great.
As of merge dc43d9fa73d82083656fb9c02f4823bcdcfb9f91 This no longer works. Adding that line to /proc/mtrr no longer has any effect (cat /proc/mtrr shows only the reg00 entry).
Reverting that merge on top of rc3 brings things back to normal and /proc/mtrr shows: reg00: base=0x000000000 ( 0MB), size= 512MB, count=1: write-back reg01: base=0x048000000 ( 1152MB), size= 128MB, count=1: write-combining reg02: base=0x020000000 ( 512MB), size= 128MB, count=2: write-back
Any ideas how to track this down futher? Would be good to get it fixed for 3.1
-Anders
| |