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ab42b818 | 1 | ============== |
1da177e4 | 2 | What is tgafb? |
ab42b818 | 3 | ============== |
1da177e4 LT |
4 | |
5 | This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA | |
6 | cards, which are usually found in older Digital Alpha systems. The | |
7 | following models are supported: | |
8 | ||
ab42b818 MCC |
9 | - ZLxP-E1 (8bpp, 2 MB VRAM) |
10 | - ZLxP-E2 (32bpp, 8 MB VRAM) | |
11 | - ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer) | |
1da177e4 LT |
12 | |
13 | This version is an almost complete rewrite of the code written by Geert | |
14 | Uytterhoeven, which was based on the original TGA console code written by | |
15 | Jay Estabrook. | |
16 | ||
17 | Major new features since Linux 2.0.x: | |
18 | ||
19 | * Support for multiple resolutions | |
ab42b818 | 20 | * Support for fixed-frequency and other oddball monitors |
1da177e4 LT |
21 | (by allowing the video mode to be set at boot time) |
22 | ||
23 | User-visible changes since Linux 2.2.x: | |
24 | ||
25 | * Sync-on-green is now handled properly | |
26 | * More useful information is printed on bootup | |
27 | (this helps if people run into problems) | |
28 | ||
29 | This driver does not (yet) support the TGA2 family of framebuffers, so the | |
30 | PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These | |
31 | can however be used with the standard VGA Text Console driver. | |
32 | ||
33 | ||
34 | Configuration | |
35 | ============= | |
36 | ||
37 | You can pass kernel command line options to tgafb with | |
ab42b818 MCC |
38 | `video=tgafb:option1,option2:value2,option3` (multiple options should be |
39 | separated by comma, values are separated from options by `:`). | |
40 | ||
1da177e4 LT |
41 | Accepted options: |
42 | ||
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43 | ========== ============================================================ |
44 | font:X default font to use. All fonts are supported, including the | |
45 | SUN12x22 font which is very nice at high resolutions. | |
1da177e4 | 46 | |
ab42b818 MCC |
47 | mode:X default video mode. The following video modes are supported: |
48 | 640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72, | |
1da177e4 LT |
49 | 1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76, |
50 | 1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70, | |
51 | 1152x864-84, 1280x1024-76, 1280x1024-85 | |
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52 | ========== ============================================================ |
53 | ||
1da177e4 LT |
54 | |
55 | Known Issues | |
56 | ============ | |
57 | ||
58 | The XFree86 FBDev server has been reported not to work, since tgafb doesn't do | |
59 | mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for | |
60 | me, however this server does not do acceleration, which make certain operations | |
61 | quite slow. Support for acceleration is being progressively integrated in | |
62 | XFree86 4.x. | |
63 | ||
64 | When running tgafb in resolutions higher than 640x480, on switching VCs from | |
65 | tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually | |
66 | refreshed. This is an X server problem, not a tgafb problem, and is fixed in | |
67 | XFree86 4.0. | |
68 | ||
69 | Enjoy! | |
70 | ||
71 | Martin Lucina <mato@kotelna.sk> |