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Commit | Line | Data |
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1da177e4 LT |
1 | Tridentfb is a framebuffer driver for some Trident chip based cards. |
2 | ||
3 | The following list of chips is thought to be supported although not all are | |
4 | tested: | |
5 | ||
6 | those from the Image series with Cyber in their names - accelerated | |
7 | those with Blade in their names (Blade3D,CyberBlade...) - accelerated | |
8 | the newer CyberBladeXP family - nonaccelerated | |
9 | ||
10 | Only PCI/AGP based cards are supported, none of the older Tridents. | |
11 | ||
12 | How to use it? | |
13 | ============== | |
14 | ||
15 | When booting you can pass the video parameter. | |
16 | video=tridentfb | |
17 | ||
18 | The parameters for tridentfb are concatenated with a ':' as in this example. | |
19 | ||
20 | video=tridentfb:800x600,bpp=16,noaccel | |
21 | ||
22 | The second level parameters that tridentfb understands are: | |
23 | ||
24 | noaccel - turns off acceleration (when it doesn't work for your card) | |
25 | accel - force text acceleration (for boards which by default are noacceled) | |
26 | ||
27 | fp - use flat panel related stuff | |
28 | crt - assume monitor is present instead of fp | |
29 | ||
30 | center - for flat panels and resolutions smaller than native size center the | |
31 | image, otherwise use | |
32 | stretch | |
33 | ||
34 | memsize - integer value in Kb, use if your card's memory size is misdetected. | |
35 | look at the driver output to see what it says when initializing. | |
36 | memdiff - integer value in Kb,should be nonzero if your card reports | |
37 | more memory than it actually has.For instance mine is 192K less than | |
38 | detection says in all three BIOS selectable situations 2M, 4M, 8M. | |
39 | Only use if your video memory is taken from main memory hence of | |
40 | configurable size.Otherwise use memsize. | |
41 | If in some modes which barely fit the memory you see garbage at the bottom | |
42 | this might help by not letting change to that mode anymore. | |
43 | ||
44 | nativex - the width in pixels of the flat panel.If you know it (usually 1024 | |
45 | 800 or 1280) and it is not what the driver seems to detect use it. | |
46 | ||
47 | bpp - bits per pixel (8,16 or 32) | |
48 | mode - a mode name like 800x600 (as described in Documentation/fb/modedb.txt) | |
49 | ||
50 | Using insane values for the above parameters will probably result in driver | |
51 | misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or | |
52 | nativex=93) | |
53 | ||
54 | Contact: jani@astechnix.ro |