git://bbs.cooldavid.org / net-next-2.6.git / blame
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1 | $Id: pvr2fb.txt,v 1.1 2001/05/24 05:09:16 mrbrown Exp $ |
| 2 | ||
| 3 | What is pvr2fb? | |
| 4 | =============== | |
| 5 | ||
| 6 | This is a driver for PowerVR 2 based graphics frame buffers, such as the | |
| 7 | one found in the Dreamcast. | |
| 8 | ||
| 9 | Advantages: | |
| 10 | ||
| 11 | * It provides a nice large console (128 cols + 48 lines with 1024x768) | |
| acb73865 | 12 | without using tiny, unreadable fonts (NOT on the Dreamcast) |
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13 | * You can run XF86_FBDev on top of /dev/fb0 |
| 14 | * Most important: boot logo :-) | |
| 15 | ||
| 16 | Disadvantages: | |
| 17 | ||
| acb73865 | 18 | * Driver is largely untested on non-Dreamcast systems. |
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19 | |
| 20 | Configuration | |
| 21 | ============= | |
| 22 | ||
| 23 | You can pass kernel command line options to pvr2fb with | |
| 24 | `video=pvr2fb:option1,option2:value2,option3' (multiple options should be | |
| 25 | separated by comma, values are separated from options by `:'). | |
| 26 | Accepted options: | |
| 27 | ||
| 28 | font:X - default font to use. All fonts are supported, including the | |
| 29 | SUN12x22 font which is very nice at high resolutions. | |
| 30 | ||
| 1da177e4 | 31 | |
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32 | mode:X - default video mode with format [xres]x[yres]-<bpp>@<refresh rate> |
| 33 | The following video modes are supported: | |
| 34 | 640x640-16@60, 640x480-24@60, 640x480-32@60. The Dreamcast | |
| 35 | defaults to 640x480-16@60. At the time of writing the | |
| 36 | 24bpp and 32bpp modes function poorly. Work to fix that is | |
| 37 | ongoing | |
| 38 | ||
| 1da177e4 | 39 | Note: the 640x240 mode is currently broken, and should not be |
| acb73865 | 40 | used for any reason. It is only mentioned here as a reference. |
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41 | |
| 42 | inverse - invert colors on screen (for LCD displays) | |
| 43 | ||
| 44 | nomtrr - disables write combining on frame buffer. This slows down driver | |
| 45 | but there is reported minor incompatibility between GUS DMA and | |
| 46 | XFree under high loads if write combining is enabled (sound | |
| 47 | dropouts). MTRR is enabled by default on systems that have it | |
| 48 | configured and that support it. | |
| 49 | ||
| 50 | cable:X - cable type. This can be any of the following: vga, rgb, and | |
| 51 | composite. If none is specified, we guess. | |
| 52 | ||
| 53 | output:X - output type. This can be any of the following: pal, ntsc, and | |
| 54 | vga. If none is specified, we guess. | |
| 55 | ||
| 56 | X11 | |
| 57 | === | |
| 58 | ||
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59 | XF86_FBDev has been shown to work on the Dreamcast in the past - though not yet |
| 60 | on any 2.6 series kernel. | |
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61 | |
| 62 | -- | |
| 63 | Paul Mundt <lethal@linuxdc.org> | |
| acb73865 | 64 | Updated by Adrian McMenamin <adrian@mcmen.demon.co.uk> |
| 1da177e4 | 65 |