| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | [This file is cloned from VesaFB/matroxfb] |
| 2 | |
| 3 | What is aty128fb? |
| 4 | ================= |
| 5 | |
| 6 | This is a driver for a graphic framebuffer for ATI Rage128 based devices |
| 7 | on Intel and PPC boxes. |
| 8 | |
| 9 | Advantages: |
| 10 | |
| 11 | * It provides a nice large console (128 cols + 48 lines with 1024x768) |
| 12 | without using tiny, unreadable fonts. |
| 13 | * You can run XF68_FBDev on top of /dev/fb0 |
| 14 | * Most important: boot logo :-) |
| 15 | |
| 16 | Disadvantages: |
| 17 | |
| 18 | * graphic mode is slower than text mode... but you should not notice |
| 19 | if you use same resolution as you used in textmode. |
| 20 | * still experimental. |
| 21 | |
| 22 | |
| 23 | How to use it? |
| 24 | ============== |
| 25 | |
| 26 | Switching modes is done using the video=aty128fb:<resolution>... modedb |
| 27 | boot parameter or using `fbset' program. |
| 28 | |
| 29 | See Documentation/fb/modedb.txt for more information on modedb |
| 30 | resolutions. |
| 31 | |
| 32 | You should compile in both vgacon (to boot if you remove your Rage128 from |
| 33 | box) and aty128fb (for graphics mode). You should not compile-in vesafb |
| 34 | unless you have primary display on non-Rage128 VBE2.0 device (see |
| 35 | Documentation/fb/vesafb.txt for details). |
| 36 | |
| 37 | |
| 38 | X11 |
| 39 | === |
| 40 | |
| 41 | XF68_FBDev should generally work fine, but it is non-accelerated. As of |
| 42 | this document, 8 and 32bpp works fine. There have been palette issues |
| 43 | when switching from X to console and back to X. You will have to restart |
| 44 | X to fix this. |
| 45 | |
| 46 | |
| 47 | Configuration |
| 48 | ============= |
| 49 | |
| 50 | You can pass kernel command line options to vesafb with |
| 51 | `video=aty128fb:option1,option2:value2,option3' (multiple options should |
| 52 | be separated by comma, values are separated from options by `:'). |
| 53 | Accepted options: |
| 54 | |
| 55 | noaccel - do not use acceleration engine. It is default. |
| 56 | accel - use acceleration engine. Not finished. |
| 57 | vmode:x - chooses PowerMacintosh video mode <x>. Depreciated. |
| 58 | cmode:x - chooses PowerMacintosh colour mode <x>. Depreciated. |
| 59 | <XxX@X> - selects startup videomode. See modedb.txt for detailed |
| 60 | explanation. Default is 640x480x8bpp. |
| 61 | |
| 62 | |
| 63 | Limitations |
| 64 | =========== |
| 65 | |
| 66 | There are known and unknown bugs, features and misfeatures. |
| 67 | Currently there are following known bugs: |
| 68 | + This driver is still experimental and is not finished. Too many |
| 69 | bugs/errata to list here. |
| 70 | |
| 71 | -- |
| 72 | Brad Douglas <brad@neruo.com> |