1=============== 2What is pvr2fb? 3=============== 4 5This is a driver for PowerVR 2 based graphics frame buffers, such as the 6one found in the Dreamcast. 7 8Advantages: 9 10 * It provides a nice large console (128 cols + 48 lines with 1024x768) 11 without using tiny, unreadable fonts (NOT on the Dreamcast) 12 * You can run XF86_FBDev on top of /dev/fb0 13 * Most important: boot logo :-) 14 15Disadvantages: 16 17 * Driver is largely untested on non-Dreamcast systems. 18 19Configuration 20============= 21 22You can pass kernel command line options to pvr2fb with 23`video=pvr2fb:option1,option2:value2,option3` (multiple options should be 24separated by comma, values are separated from options by `:`). 25 26Accepted options: 27 28========== ================================================================== 29font:X default font to use. All fonts are supported, including the 30 SUN12x22 font which is very nice at high resolutions. 31 32 33mode:X default video mode with format [xres]x[yres]-<bpp>@<refresh rate> 34 The following video modes are supported: 35 640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast 36 defaults to 640x480-16@60. At the time of writing the 37 24bpp and 32bpp modes function poorly. Work to fix that is 38 ongoing 39 40 Note: the 640x240 mode is currently broken, and should not be 41 used for any reason. It is only mentioned here as a reference. 42 43inverse invert colors on screen (for LCD displays) 44 45nomtrr disables write combining on frame buffer. This slows down driver 46 but there is reported minor incompatibility between GUS DMA and 47 XFree under high loads if write combining is enabled (sound 48 dropouts). MTRR is enabled by default on systems that have it 49 configured and that support it. 50 51cable:X cable type. This can be any of the following: vga, rgb, and 52 composite. If none is specified, we guess. 53 54output:X output type. This can be any of the following: pal, ntsc, and 55 vga. If none is specified, we guess. 56========== ================================================================== 57 58X11 59=== 60 61XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet 62on any 2.6 series kernel. 63 64Paul Mundt <lethal@linuxdc.org> 65 66Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk> 67