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Diffstat (limited to 'DOCS/MTRR')
| -rw-r--r-- | DOCS/MTRR | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/DOCS/MTRR b/DOCS/MTRR new file mode 100644 index 0000000000..2a4d383462 --- /dev/null +++ b/DOCS/MTRR @@ -0,0 +1,38 @@ +Setting up MTRR for X11 or mga_vid: +=================================== + +1. find the base address +~~~~~~~~~~~~~~~~~~~~~~~~ +You have 3 cases to find it: + +- from X11 startup messages, for example: +(--) SVGA: PCI: Matrox MGA G400 AGP rev 4, Memory @ 0xd8000000, 0xd4000000 +(--) SVGA: Linear framebuffer at 0xD8000000 + +- from /proc/pci (use lspci -v command): +01:00.0 VGA compatible controller: Matrox Graphics, Inc.: Unknown device 0525 + Memory at d8000000 (32-bit, prefetchable) + +- from mga_vid kernel driver messages (use dmesg): +mga_mem_base = d8000000 + +2. find memory size +~~~~~~~~~~~~~~~~~~~ +This is much easier, just convert video ram size to hexadecimal, or +use this table: + 1 MB 0x100000 + 2 MB 0x200000 + 4 MB 0x400000 + 8 MB 0x800000 + 16 MB 0x1000000 + 32 MB 0x2000000 + +3. setting up mtrr +~~~~~~~~~~~~~~~~~~ +You know base address and memory size, let's setup mtrr registers! + + For example, for the matrox card above (base=0xd8000000) with 32MB + ram (size=0x2000000) just execute: +echo "base=0xd8000000 size=0x2000000 type=write-combining" >| /proc/mtrr + +(older K6-2's [around 266Mhz, stepping 0] may not support MTRR.) |