| $Id: tgafb.txt,v 1.1.2.2 2000/04/04 06:50:18 mato Exp $ | |
| What is tgafb? | |
| =============== | |
| This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA | |
| cards, which are usually found in older Digital Alpha systems. The | |
| following models are supported: | |
| ZLxP-E1 (8bpp, 2 MB VRAM) | |
| ZLxP-E2 (32bpp, 8 MB VRAM) | |
| ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer) | |
| This version is an almost complete rewrite of the code written by Geert | |
| Uytterhoeven, which was based on the original TGA console code written by | |
| Jay Estabrook. | |
| Major new features since Linux 2.0.x: | |
| * Support for multiple resolutions | |
| * Support for fixed-frequency and other oddball monitors | |
| (by allowing the video mode to be set at boot time) | |
| User-visible changes since Linux 2.2.x: | |
| * Sync-on-green is now handled properly | |
| * More useful information is printed on bootup | |
| (this helps if people run into problems) | |
| This driver does not (yet) support the TGA2 family of framebuffers, so the | |
| PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These | |
| can however be used with the standard VGA Text Console driver. | |
| Configuration | |
| ============= | |
| You can pass kernel command line options to tgafb with | |
| `video=tgafb:option1,option2:value2,option3' (multiple options should be | |
| separated by comma, values are separated from options by `:'). | |
| Accepted options: | |
| font:X - default font to use. All fonts are supported, including the | |
| SUN12x22 font which is very nice at high resolutions. | |
| mode:X - default video mode. The following video modes are supported: | |
| 640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72, | |
| 1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76, | |
| 1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70, | |
| 1152x864-84, 1280x1024-76, 1280x1024-85 | |
| Known Issues | |
| ============ | |
| The XFree86 FBDev server has been reported not to work, since tgafb doesn't do | |
| mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for | |
| me, however this server does not do acceleration, which make certain operations | |
| quite slow. Support for acceleration is being progressively integrated in | |
| XFree86 4.x. | |
| When running tgafb in resolutions higher than 640x480, on switching VCs from | |
| tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually | |
| refreshed. This is an X server problem, not a tgafb problem, and is fixed in | |
| XFree86 4.0. | |
| Enjoy! | |
| Martin Lucina <mato@kotelna.sk> |