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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/fb/tridentfb.txt
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+Tridentfb is a framebuffer driver for some Trident chip based cards.
+
+The following list of chips is thought to be supported although not all are
+tested:
+
+those from the Image series with Cyber in their names - accelerated
+those with Blade in their names (Blade3D,CyberBlade...) - accelerated
+the newer CyberBladeXP family - nonaccelerated
+
+Only PCI/AGP based cards are supported, none of the older Tridents.
+
+How to use it?
+==============
+
+When booting you can pass the video parameter.
+video=tridentfb
+
+The parameters for tridentfb are concatenated with a ':' as in this example.
+
+video=tridentfb:800x600,bpp=16,noaccel
+
+The second level parameters that tridentfb understands are:
+
+noaccel - turns off acceleration (when it doesn't work for your card)
+accel - force text acceleration (for boards which by default are noacceled)
+
+fp - use flat panel related stuff
+crt - assume monitor is present instead of fp
+
+center - for flat panels and resolutions smaller than native size center the
+ image, otherwise use
+stretch
+
+memsize - integer value in Kb, use if your card's memory size is misdetected.
+ look at the driver output to see what it says when initializing.
+memdiff - integer value in Kb,should be nonzero if your card reports
+ more memory than it actually has.For instance mine is 192K less than
+ detection says in all three BIOS selectable situations 2M, 4M, 8M.
+ Only use if your video memory is taken from main memory hence of
+ configurable size.Otherwise use memsize.
+ If in some modes which barely fit the memory you see garbage at the bottom
+ this might help by not letting change to that mode anymore.
+
+nativex - the width in pixels of the flat panel.If you know it (usually 1024
+ 800 or 1280) and it is not what the driver seems to detect use it.
+
+bpp - bits per pixel (8,16 or 32)
+mode - a mode name like 800x600 (as described in Documentation/fb/modedb.txt)
+
+Using insane values for the above parameters will probably result in driver
+misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or
+nativex=93)
+
+Contact: jani@astechnix.ro