Initial revision

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2

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+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.)