| [This file is cloned from VesaFB/matroxfb] |
| |
| What is aty128fb? |
| ================= |
| |
| This is a driver for a graphic framebuffer for ATI Rage128 based devices |
| on Intel and PPC boxes. |
| |
| Advantages: |
| |
| * It provides a nice large console (128 cols + 48 lines with 1024x768) |
| without using tiny, unreadable fonts. |
| * You can run XF68_FBDev on top of /dev/fb0 |
| * Most important: boot logo :-) |
| |
| Disadvantages: |
| |
| * graphic mode is slower than text mode... but you should not notice |
| if you use same resolution as you used in textmode. |
| * still experimental. |
| |
| |
| How to use it? |
| ============== |
| |
| Switching modes is done using the video=aty128fb:<resolution>... modedb |
| boot parameter or using `fbset' program. |
| |
| See Documentation/fb/modedb.txt for more information on modedb |
| resolutions. |
| |
| You should compile in both vgacon (to boot if you remove your Rage128 from |
| box) and aty128fb (for graphics mode). You should not compile-in vesafb |
| unless you have primary display on non-Rage128 VBE2.0 device (see |
| Documentation/fb/vesafb.txt for details). |
| |
| |
| X11 |
| === |
| |
| XF68_FBDev should generally work fine, but it is non-accelerated. As of |
| this document, 8 and 32bpp works fine. There have been palette issues |
| when switching from X to console and back to X. You will have to restart |
| X to fix this. |
| |
| |
| Configuration |
| ============= |
| |
| You can pass kernel command line options to vesafb with |
| `video=aty128fb:option1,option2:value2,option3' (multiple options should |
| be separated by comma, values are separated from options by `:'). |
| Accepted options: |
| |
| noaccel - do not use acceleration engine. It is default. |
| accel - use acceleration engine. Not finished. |
| vmode:x - chooses PowerMacintosh video mode <x>. Deprecated. |
| cmode:x - chooses PowerMacintosh colour mode <x>. Deprecated. |
| <XxX@X> - selects startup videomode. See modedb.txt for detailed |
| explanation. Default is 640x480x8bpp. |
| |
| |
| Limitations |
| =========== |
| |
| There are known and unknown bugs, features and misfeatures. |
| Currently there are following known bugs: |
| + This driver is still experimental and is not finished. Too many |
| bugs/errata to list here. |
| |
| -- |
| Brad Douglas <brad@neruo.com> |
