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-Setting up MTRR for X11 3.3.x, SVGAlib or mga_vid:
-==================================================
-
-1. find the base address
-~~~~~~~~~~~~~~~~~~~~~~~~
-You have 3 ways 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 very easy, 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] doesn't support MTRR, but
- stepping 12's do ('cat /proc/cpuinfo' to check it).