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1=================2What is aty128fb?3=================4 5.. [This file is cloned from VesaFB/matroxfb]6 7This is a driver for a graphic framebuffer for ATI Rage128 based devices8on Intel and PPC boxes.9 10Advantages: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/fb015 * Most important: boot logo :-)16 17Disadvantages:18 19 * graphic mode is slower than text mode... but you should not notice20 if you use same resolution as you used in textmode.21 * still experimental.22 23 24How to use it?25==============26 27Switching modes is done using the video=aty128fb:<resolution>... modedb28boot parameter or using `fbset` program.29 30See Documentation/fb/modedb.rst for more information on modedb31resolutions.32 33You should compile in both vgacon (to boot if you remove your Rage128 from34box) and aty128fb (for graphics mode). You should not compile-in vesafb35unless you have primary display on non-Rage128 VBE2.0 device (see36Documentation/fb/vesafb.rst for details).37 38 39X1140===41 42XF68_FBDev should generally work fine, but it is non-accelerated. As of43this document, 8 and 32bpp works fine. There have been palette issues44when switching from X to console and back to X. You will have to restart45X to fix this.46 47 48Configuration49=============50 51You can pass kernel command line options to vesafb with52`video=aty128fb:option1,option2:value2,option3` (multiple options should53be separated by comma, values are separated from options by `:`).54Accepted options:55 56========= =======================================================57noaccel do not use acceleration engine. It is default.58accel use acceleration engine. Not finished.59vmode:x chooses PowerMacintosh video mode <x>. Deprecated.60cmode:x chooses PowerMacintosh colour mode <x>. Deprecated.61<XxX@X> selects startup videomode. See modedb.txt for detailed62 explanation. Default is 640x480x8bpp.63========= =======================================================64 65 66Limitations67===========68 69There are known and unknown bugs, features and misfeatures.70Currently there are following known bugs:71 72 - This driver is still experimental and is not finished. Too many73 bugs/errata to list here.74 75Brad Douglas <brad@neruo.com>76