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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 | ||