1 $Id: tgafb.txt,v 1.1.2.2 2000/04/04 06:50:18 mato Exp $
2
3 What is tgafb?
4 ===============
5
6 This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA
7 cards, which are usually found in older Digital Alpha systems. The
8 following models are supported:
9
10 ZLxP-E1 (8bpp, 2 MB VRAM)
11 ZLxP-E2 (32bpp, 8 MB VRAM)
12 ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer)
13
14 This version is an almost complete rewrite of the code written by Geert
15 Uytterhoeven, which was based on the original TGA console code written by
16 Jay Estabrook.
17
18 Major new features since Linux 2.0.x:
19
20 * Support for multiple resolutions
21 * Support for fixed-frequency and other oddball monitors
22 (by allowing the video mode to be set at boot time)
23
24 User-visible changes since Linux 2.2.x:
25
26 * Sync-on-green is now handled properly
27 * More useful information is printed on bootup
28 (this helps if people run into problems)
29
30 This driver does not (yet) support the TGA2 family of framebuffers, so the
31 PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These
32 can however be used with the standard VGA Text Console driver.
33
34
35 Configuration
36 =============
37
38 You can pass kernel command line options to tgafb with
39 `video=tgafb:option1,option2:value2,option3' (multiple options should be
40 separated by comma, values are separated from options by `:').
41 Accepted options:
42
43 font:X - default font to use. All fonts are supported, including the
44 SUN12x22 font which is very nice at high resolutions.
45
46 mode:X - default video mode. The following video modes are supported:
47 640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72,
48 1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76,
49 1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70,
50 1152x864-84, 1280x1024-76, 1280x1024-85
51
52
53 Known Issues
54 ============
55
56 The XFree86 FBDev server has been reported not to work, since tgafb doesn't do
57 mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for
58 me, however this server does not do acceleration, which make certain operations
59 quite slow. Support for acceleration is being progressively integrated in
60 XFree86 4.x.
61
62 When running tgafb in resolutions higher than 640x480, on switching VCs from
63 tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually
64 refreshed. This is an X server problem, not a tgafb problem, and is fixed in
65 XFree86 4.0.
66
67 Enjoy!
68
69 Martin Lucina <mato@kotelna.sk>
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