Én ezt a scriptet írtam. elraktam a /usr/local/bin-be, aztán azt meg az rc.sysinit végére pakoltam.
Ennyi.
#!/bin/bash
echo -e "disable=0" > /proc/mtrr
echo -e "disable=1" > /proc/mtrr
echo -e "disable=2" > /proc/mtrr
echo -e "disable=3" > /proc/mtrr
echo -e "disable=4" > /proc/mtrr
echo -e "base=0xc0000000 size=0x10000000 type=uncachable" > /proc/mtrr
echo -e "base=0x00000000 size=0x80000000 type=write-back" > /proc/mtrr
echo -e "base=0x100000000 size=0x40000000 type=write-back" > /proc/mtrr
echo -e "base=0xbf700000 size=0x00100000 type=uncachable" > /proc/mtrr
echo -e "base=0xbf800000 size=0x00800000 type=uncachable" > /proc/mtrr
echo -e "base=0x80000000 size=0x40000000 type=write-back" > /proc/mtrr
echo -e "base=0xe0000000 size=0x20000000 type=uncachable" > /proc/mtrr