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1=========2Tridentfb3=========4 5Tridentfb is a framebuffer driver for some Trident chip based cards.6 7The following list of chips is thought to be supported although not all are8tested:9 10those from the TGUI series 9440/96XX and with Cyber in their names11those from the Image series and with Cyber in their names12those with Blade in their names (Blade3D,CyberBlade...)13the newer CyberBladeXP family14 15All families are accelerated. Only PCI/AGP based cards are supported,16none of the older Tridents.17The driver supports 8, 16 and 32 bits per pixel depths.18The TGUI family requires a line length to be power of 2 if acceleration19is enabled. This means that range of possible resolutions and bpp is20limited comparing to the range if acceleration is disabled (see list21of parameters below).22 23Known bugs:24 251. The driver randomly locks up on 3DImage975 chip with acceleration26 enabled. The same happens in X11 (Xorg).272. The ramdac speeds require some more fine tuning. It is possible to28 switch resolution which the chip does not support at some depths for29 older chips.30 31How to use it?32==============33 34When booting you can pass the video parameter::35 36 video=tridentfb37 38The parameters for tridentfb are concatenated with a ':' as in this example::39 40 video=tridentfb:800x600-16@75,noaccel41 42The second level parameters that tridentfb understands are:43 44======== =====================================================================45noaccel turns off acceleration (when it doesn't work for your card)46 47fp use flat panel related stuff48crt assume monitor is present instead of fp49 50center for flat panels and resolutions smaller than native size center the51 image, otherwise use52stretch53 54memsize integer value in KB, use if your card's memory size is misdetected.55 look at the driver output to see what it says when initializing.56 57memdiff integer value in KB, should be nonzero if your card reports58 more memory than it actually has. For instance mine is 192K less than59 detection says in all three BIOS selectable situations 2M, 4M, 8M.60 Only use if your video memory is taken from main memory hence of61 configurable size. Otherwise use memsize.62 If in some modes which barely fit the memory you see garbage63 at the bottom this might help by not letting change to that mode64 anymore.65 66nativex the width in pixels of the flat panel.If you know it (usually 102467 800 or 1280) and it is not what the driver seems to detect use it.68 69bpp bits per pixel (8,16 or 32)70mode a mode name like 800x600-8@75 as described in71 Documentation/fb/modedb.rst72======== =====================================================================73 74Using insane values for the above parameters will probably result in driver75misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or76nativex=93)77 78Contact: jani@astechnix.ro79