| $Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $ | |
| What is pvr2fb? | |
| =============== | |
| This is a driver for PowerVR 2 based graphics frame buffers, such as the | |
| one found in the Dreamcast. | |
| Advantages: | |
| * It provides a nice large console (128 cols + 48 lines with 1024x768) | |
| without using tiny, unreadable fonts (NOT on the Dreamcast) | |
| * You can run XF86_FBDev on top of /dev/fb0 | |
| * Most important: boot logo :-) | |
| Disadvantages: | |
| * Driver is largely untested on non-Dreamcast systems. | |
| Configuration | |
| ============= | |
| You can pass kernel command line options to pvr2fb with | |
| `video=pvr2fb:option1,option2:value2,option3' (multiple options should be | |
| separated by comma, values are separated from options by `:'). | |
| Accepted options: | |
| font:X - default font to use. All fonts are supported, including the | |
| SUN12x22 font which is very nice at high resolutions. | |
| mode:X - default video mode with format [xres]x[yres]-<bpp>@<refresh rate> | |
| The following video modes are supported: | |
| 640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast | |
| defaults to 640x480-16@60. At the time of writing the | |
| 24bpp and 32bpp modes function poorly. Work to fix that is | |
| ongoing | |
| Note: the 640x240 mode is currently broken, and should not be | |
| used for any reason. It is only mentioned here as a reference. | |
| inverse - invert colors on screen (for LCD displays) | |
| nomtrr - disables write combining on frame buffer. This slows down driver | |
| but there is reported minor incompatibility between GUS DMA and | |
| XFree under high loads if write combining is enabled (sound | |
| dropouts). MTRR is enabled by default on systems that have it | |
| configured and that support it. | |
| cable:X - cable type. This can be any of the following: vga, rgb, and | |
| composite. If none is specified, we guess. | |
| output:X - output type. This can be any of the following: pal, ntsc, and | |
| vga. If none is specified, we guess. | |
| X11 | |
| === | |
| XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet | |
| on any 2.6 series kernel. | |
| -- | |
| Paul Mundt <lethal@linuxdc.org> | |
| Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk> | |