mirror of https://gitee.com/openkylin/linux.git
79 lines
2.8 KiB
ReStructuredText
79 lines
2.8 KiB
ReStructuredText
|
=========
|
||
|
|
Tridentfb
|
||
|
|
=========
|
||
|
|
|
||
|
|
Tridentfb is a framebuffer driver for some Trident chip based cards.
|
||
|
|
|
||
|
|
The following list of chips is thought to be supported although not all are
|
||
|
|
tested:
|
||
|
|
|
||
|
|
those from the TGUI series 9440/96XX and with Cyber in their names
|
||
|
|
those from the Image series and with Cyber in their names
|
||
|
|
those with Blade in their names (Blade3D,CyberBlade...)
|
||
|
|
the newer CyberBladeXP family
|
||
|
|
|
||
|
|
All families are accelerated. Only PCI/AGP based cards are supported,
|
||
|
|
none of the older Tridents.
|
||
|
|
The driver supports 8, 16 and 32 bits per pixel depths.
|
||
|
|
The TGUI family requires a line length to be power of 2 if acceleration
|
||
|
|
is enabled. This means that range of possible resolutions and bpp is
|
||
|
|
limited comparing to the range if acceleration is disabled (see list
|
||
|
|
of parameters below).
|
||
|
|
|
||
|
|
Known bugs:
|
||
|
|
|
||
|
|
1. The driver randomly locks up on 3DImage975 chip with acceleration
|
||
|
|
enabled. The same happens in X11 (Xorg).
|
||
|
|
2. The ramdac speeds require some more fine tuning. It is possible to
|
||
|
|
switch resolution which the chip does not support at some depths for
|
||
|
|
older chips.
|
||
|
|
|
||
|
|
How to use it?
|
||
|
|
==============
|
||
|
|
|
||
|
|
When booting you can pass the video parameter::
|
||
|
|
|
||
|
|
video=tridentfb
|
||
|
|
|
||
|
|
The parameters for tridentfb are concatenated with a ':' as in this example::
|
||
|
|
|
||
|
|
video=tridentfb:800x600-16@75,noaccel
|
||
|
|
|
||
|
|
The second level parameters that tridentfb understands are:
|
||
|
|
|
||
|
|
======== =====================================================================
|
||
|
|
noaccel turns off acceleration (when it doesn't work for your card)
|
||
|
|
|
||
|
|
fp use flat panel related stuff
|
||
|
|
crt assume monitor is present instead of fp
|
||
|
|
|
||
|
|
center for flat panels and resolutions smaller than native size center the
|
||
|
|
image, otherwise use
|
||
|
|
stretch
|
||
|
|
|
||
|
|
memsize integer value in KB, use if your card's memory size is misdetected.
|
||
|
|
look at the driver output to see what it says when initializing.
|
||
|
|
|
||
|
|
memdiff integer value in KB, should be nonzero if your card reports
|
||
|
|
more memory than it actually has. For instance mine is 192K less than
|
||
|
|
detection says in all three BIOS selectable situations 2M, 4M, 8M.
|
||
|
|
Only use if your video memory is taken from main memory hence of
|
||
|
|
configurable size. Otherwise use memsize.
|
||
|
|
If in some modes which barely fit the memory you see garbage
|
||
|
|
at the bottom this might help by not letting change to that mode
|
||
|
|
anymore.
|
||
|
|
|
||
|
|
nativex the width in pixels of the flat panel.If you know it (usually 1024
|
||
|
|
800 or 1280) and it is not what the driver seems to detect use it.
|
||
|
|
|
||
|
|
bpp bits per pixel (8,16 or 32)
|
||
|
|
mode a mode name like 800x600-8@75 as described in
|
||
|
|
Documentation/fb/modedb.rst
|
||
|
|
======== =====================================================================
|
||
|
|
|
||
|
|
Using insane values for the above parameters will probably result in driver
|
||
|
|
misbehaviour so take care(for instance memsize=12345678 or memdiff=23784 or
|
||
|
|
nativex=93)
|
||
|
|
|
||
|
|
Contact: jani@astechnix.ro
|