projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| ab42b818 MCC |
1 | =============== |
| 2 | What is pvr2fb? | |
| 3 | =============== | |
| 4 | ||
| 5 | This is a driver for PowerVR 2 based graphics frame buffers, such as the | |
| 6 | one found in the Dreamcast. | |
| 7 | ||
| 8 | Advantages: | |
| 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 | ||
| 15 | Disadvantages: | |
| 16 | ||
| 17 | * Driver is largely untested on non-Dreamcast systems. | |
| 18 | ||
| 19 | Configuration | |
| 20 | ============= | |
| 21 | ||
| 22 | You can pass kernel command line options to pvr2fb with | |
| 23 | `video=pvr2fb:option1,option2:value2,option3` (multiple options should be | |
| 24 | separated by comma, values are separated from options by `:`). | |
| 25 | ||
| 26 | Accepted options: | |
| 27 | ||
| 28 | ========== ================================================================== | |
| 29 | font:X default font to use. All fonts are supported, including the | |
| 30 | SUN12x22 font which is very nice at high resolutions. | |
| 31 | ||
| 32 | ||
| 33 | mode: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 | ||
| 43 | inverse invert colors on screen (for LCD displays) | |
| 44 | ||
| 45 | nomtrr 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 | ||
| 51 | cable:X cable type. This can be any of the following: vga, rgb, and | |
| 52 | composite. If none is specified, we guess. | |
| 53 | ||
| 54 | output:X output type. This can be any of the following: pal, ntsc, and | |
| 55 | vga. If none is specified, we guess. | |
| 56 | ========== ================================================================== | |
| 57 | ||
| 58 | X11 | |
| 59 | === | |
| 60 | ||
| 61 | XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet | |
| 62 | on any 2.6 series kernel. | |
| 63 | ||
| 64 | Paul Mundt <lethal@linuxdc.org> | |
| 65 | ||
| 66 | Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk> |