| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |