projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ab42b818 | 1 | ================= |
| 1da177e4 LT |
2 | What is aty128fb? |
| 3 | ================= | |
| 4 | ||
| ab42b818 MCC |
5 | .. [This file is cloned from VesaFB/matroxfb] |
| 6 | ||
| 1da177e4 LT |
7 | This is a driver for a graphic framebuffer for ATI Rage128 based devices |
| 8 | on Intel and PPC boxes. | |
| 9 | ||
| 10 | Advantages: | |
| 11 | ||
| 12 | * It provides a nice large console (128 cols + 48 lines with 1024x768) | |
| 13 | without using tiny, unreadable fonts. | |
| 14 | * You can run XF68_FBDev on top of /dev/fb0 | |
| 15 | * Most important: boot logo :-) | |
| 16 | ||
| 17 | Disadvantages: | |
| 18 | ||
| 19 | * graphic mode is slower than text mode... but you should not notice | |
| 20 | if you use same resolution as you used in textmode. | |
| 21 | * still experimental. | |
| 22 | ||
| 23 | ||
| 24 | How to use it? | |
| 25 | ============== | |
| 26 | ||
| 27 | Switching modes is done using the video=aty128fb:<resolution>... modedb | |
| ab42b818 | 28 | boot parameter or using `fbset` program. |
| 1da177e4 | 29 | |
| ab42b818 | 30 | See Documentation/fb/modedb.rst for more information on modedb |
| 1da177e4 LT |
31 | resolutions. |
| 32 | ||
| 33 | You should compile in both vgacon (to boot if you remove your Rage128 from | |
| 34 | box) and aty128fb (for graphics mode). You should not compile-in vesafb | |
| ab42b818 MCC |
35 | unless you have primary display on non-Rage128 VBE2.0 device (see |
| 36 | Documentation/fb/vesafb.rst for details). | |
| 1da177e4 LT |
37 | |
| 38 | ||
| 39 | X11 | |
| 40 | === | |
| 41 | ||
| 42 | XF68_FBDev should generally work fine, but it is non-accelerated. As of | |
| 43 | this document, 8 and 32bpp works fine. There have been palette issues | |
| 44 | when switching from X to console and back to X. You will have to restart | |
| 45 | X to fix this. | |
| 46 | ||
| 47 | ||
| 48 | Configuration | |
| 49 | ============= | |
| 50 | ||
| 51 | You can pass kernel command line options to vesafb with | |
| ab42b818 MCC |
52 | `video=aty128fb:option1,option2:value2,option3` (multiple options should |
| 53 | be separated by comma, values are separated from options by `:`). | |
| 1da177e4 LT |
54 | Accepted options: |
| 55 | ||
| ab42b818 MCC |
56 | ========= ======================================================= |
| 57 | noaccel do not use acceleration engine. It is default. | |
| 58 | accel use acceleration engine. Not finished. | |
| 59 | vmode:x chooses PowerMacintosh video mode <x>. Deprecated. | |
| 60 | cmode:x chooses PowerMacintosh colour mode <x>. Deprecated. | |
| 61 | <XxX@X> selects startup videomode. See modedb.txt for detailed | |
| 62 | explanation. Default is 640x480x8bpp. | |
| 63 | ========= ======================================================= | |
| 1da177e4 LT |
64 | |
| 65 | ||
| 66 | Limitations | |
| 67 | =========== | |
| 68 | ||
| 69 | There are known and unknown bugs, features and misfeatures. | |
| 70 | Currently there are following known bugs: | |
| ab42b818 MCC |
71 | |
| 72 | - This driver is still experimental and is not finished. Too many | |
| 1da177e4 LT |
73 | bugs/errata to list here. |
| 74 | ||
| 1da177e4 | 75 | Brad Douglas <[email protected]> |