1$Id: pvr2fb.txt,v 1.1.1.1 2007/08/03 18:51:29 Exp $ 2 3What is pvr2fb? 4=============== 5 6This is a driver for PowerVR 2 based graphics frame buffers, such as the 7one found in the Dreamcast. 8 9Advantages: 10 11 * It provides a nice large console (128 cols + 48 lines with 1024x768) 12 without using tiny, unreadable fonts. 13 * You can run XF86_FBDev on top of /dev/fb0 14 * Most important: boot logo :-) 15 16Disadvantages: 17 18 * Driver is currently limited to the Dreamcast PowerVR 2 implementation 19 at the time of this writing. 20 21Configuration 22============= 23 24You can pass kernel command line options to pvr2fb with 25`video=pvr2fb:option1,option2:value2,option3' (multiple options should be 26separated by comma, values are separated from options by `:'). 27Accepted options: 28 29font:X - default font to use. All fonts are supported, including the 30 SUN12x22 font which is very nice at high resolutions. 31 32mode:X - default video mode. The following video modes are supported: 33 640x240-60, 640x480-60. 34 35 Note: the 640x240 mode is currently broken, and should not be 36 used for any reason. It is only mentioned as a reference. 37 38inverse - invert colors on screen (for LCD displays) 39 40nomtrr - disables write combining on frame buffer. This slows down driver 41 but there is reported minor incompatibility between GUS DMA and 42 XFree under high loads if write combining is enabled (sound 43 dropouts). MTRR is enabled by default on systems that have it 44 configured and that support it. 45 46cable:X - cable type. This can be any of the following: vga, rgb, and 47 composite. If none is specified, we guess. 48 49output:X - output type. This can be any of the following: pal, ntsc, and 50 vga. If none is specified, we guess. 51 52X11 53=== 54 55XF86_FBDev should work, in theory. At the time of this writing it is 56totally untested and may or may not even portray the beginnings of 57working. If you end up testing this, please let me know! 58 59-- 60Paul Mundt <lethal@linuxdc.org> 61