414 lines
19 KiB
Plaintext
414 lines
19 KiB
Plaintext
[This file is cloned from VesaFB. Thanks go to Gerd Knorr]
|
|
|
|
What is matroxfb?
|
|
=================
|
|
|
|
This is a driver for a graphic framebuffer for Matrox devices on
|
|
Alpha, Intel and PPC boxes.
|
|
|
|
Advantages:
|
|
|
|
* It provides a nice large console (128 cols + 48 lines with 1024x768)
|
|
without using tiny, unreadable fonts.
|
|
* You can run XF{68,86}_FBDev or XFree86 fbdev driver on top of /dev/fb0
|
|
* Most important: boot logo :-)
|
|
|
|
Disadvantages:
|
|
|
|
* graphic mode is slower than text mode... but you should not notice
|
|
if you use same resolution as you used in textmode.
|
|
|
|
|
|
How to use it?
|
|
==============
|
|
|
|
Switching modes is done using the video=matroxfb:vesa:... boot parameter
|
|
or using `fbset' program.
|
|
|
|
If you want, for example, enable a resolution of 1280x1024x24bpp you should
|
|
pass to the kernel this command line: "video=matroxfb:vesa:0x1BB".
|
|
|
|
You should compile in both vgacon (to boot if you remove you Matrox from
|
|
box) and matroxfb (for graphics mode). You should not compile-in vesafb
|
|
unless you have primary display on non-Matrox VBE2.0 device (see
|
|
Documentation/fb/vesafb.txt for details).
|
|
|
|
Currently supported video modes are (through vesa:... interface, PowerMac
|
|
has [as addon] compatibility code):
|
|
|
|
|
|
[Graphic modes]
|
|
|
|
bpp | 640x400 640x480 768x576 800x600 960x720
|
|
----+--------------------------------------------
|
|
4 | 0x12 0x102
|
|
8 | 0x100 0x101 0x180 0x103 0x188
|
|
15 | 0x110 0x181 0x113 0x189
|
|
16 | 0x111 0x182 0x114 0x18A
|
|
24 | 0x1B2 0x184 0x1B5 0x18C
|
|
32 | 0x112 0x183 0x115 0x18B
|
|
|
|
|
|
[Graphic modes (continued)]
|
|
|
|
bpp | 1024x768 1152x864 1280x1024 1408x1056 1600x1200
|
|
----+------------------------------------------------
|
|
4 | 0x104 0x106
|
|
8 | 0x105 0x190 0x107 0x198 0x11C
|
|
15 | 0x116 0x191 0x119 0x199 0x11D
|
|
16 | 0x117 0x192 0x11A 0x19A 0x11E
|
|
24 | 0x1B8 0x194 0x1BB 0x19C 0x1BF
|
|
32 | 0x118 0x193 0x11B 0x19B
|
|
|
|
|
|
[Text modes]
|
|
|
|
text | 640x400 640x480 1056x344 1056x400 1056x480
|
|
-----+------------------------------------------------
|
|
8x8 | 0x1C0 0x108 0x10A 0x10B 0x10C
|
|
8x16 | 2, 3, 7 0x109
|
|
|
|
You can enter these number either hexadecimal (leading `0x') or decimal
|
|
(0x100 = 256). You can also use value + 512 to achieve compatibility
|
|
with your old number passed to vesafb.
|
|
|
|
Non-listed number can be achieved by more complicated command-line, for
|
|
example 1600x1200x32bpp can be specified by `video=matroxfb:vesa:0x11C,depth:32'.
|
|
|
|
|
|
X11
|
|
===
|
|
|
|
XF{68,86}_FBDev should work just fine, but it is non-accelerated. On non-intel
|
|
architectures there are some glitches for 24bpp videomodes. 8, 16 and 32bpp
|
|
works fine.
|
|
|
|
Running another (accelerated) X-Server like XF86_SVGA works too. But (at least)
|
|
XFree servers have big troubles in multihead configurations (even on first
|
|
head, not even talking about second). Running XFree86 4.x accelerated mga
|
|
driver is possible, but you must not enable DRI - if you do, resolution and
|
|
color depth of your X desktop must match resolution and color depths of your
|
|
virtual consoles, otherwise X will corrupt accelerator settings.
|
|
|
|
|
|
SVGALib
|
|
=======
|
|
|
|
Driver contains SVGALib compatibility code. It is turned on by choosing textual
|
|
mode for console. You can do it at boot time by using videomode
|
|
2,3,7,0x108-0x10C or 0x1C0. At runtime, `fbset -depth 0' does this work.
|
|
Unfortunately, after SVGALib application exits, screen contents is corrupted.
|
|
Switching to another console and back fixes it. I hope that it is SVGALib's
|
|
problem and not mine, but I'm not sure.
|
|
|
|
|
|
Configuration
|
|
=============
|
|
|
|
You can pass kernel command line options to matroxfb with
|
|
`video=matroxfb:option1,option2:value2,option3' (multiple options should be
|
|
separated by comma, values are separated from options by `:').
|
|
Accepted options:
|
|
|
|
mem:X - size of memory (X can be in megabytes, kilobytes or bytes)
|
|
You can only decrease value determined by driver because of
|
|
it always probe for memory. Default is to use whole detected
|
|
memory usable for on-screen display (i.e. max. 8 MB).
|
|
disabled - do not load driver; you can use also `off', but `disabled'
|
|
is here too.
|
|
enabled - load driver, if you have `video=matroxfb:disabled' in LILO
|
|
configuration, you can override it by this (you cannot override
|
|
`off'). It is default.
|
|
noaccel - do not use acceleration engine. It does not work on Alphas.
|
|
accel - use acceleration engine. It is default.
|
|
nopan - create initial consoles with vyres = yres, thus disabling virtual
|
|
scrolling.
|
|
pan - create initial consoles as tall as possible (vyres = memory/vxres).
|
|
It is default.
|
|
nopciretry - disable PCI retries. It is needed for some broken chipsets,
|
|
it is autodetected for intel's 82437. In this case device does
|
|
not comply to PCI 2.1 specs (it will not guarantee that every
|
|
transaction terminate with success or retry in 32 PCLK).
|
|
pciretry - enable PCI retries. It is default, except for intel's 82437.
|
|
novga - disables VGA I/O ports. It is default if BIOS did not enable device.
|
|
You should not use this option, some boards then do not restart
|
|
without power off.
|
|
vga - preserve state of VGA I/O ports. It is default. Driver does not
|
|
enable VGA I/O if BIOS did not it (it is not safe to enable it in
|
|
most cases).
|
|
nobios - disables BIOS ROM. It is default if BIOS did not enable BIOS itself.
|
|
You should not use this option, some boards then do not restart
|
|
without power off.
|
|
bios - preserve state of BIOS ROM. It is default. Driver does not enable
|
|
BIOS if BIOS was not enabled before.
|
|
noinit - tells driver, that devices were already initialized. You should use
|
|
it if you have G100 and/or if driver cannot detect memory, you see
|
|
strange pattern on screen and so on. Devices not enabled by BIOS
|
|
are still initialized. It is default.
|
|
init - driver initializes every device it knows about.
|
|
memtype - specifies memory type, implies 'init'. This is valid only for G200
|
|
and G400 and has following meaning:
|
|
G200: 0 -> 2x128Kx32 chips, 2MB onboard, probably sgram
|
|
1 -> 2x128Kx32 chips, 4MB onboard, probably sgram
|
|
2 -> 2x256Kx32 chips, 4MB onboard, probably sgram
|
|
3 -> 2x256Kx32 chips, 8MB onboard, probably sgram
|
|
4 -> 2x512Kx16 chips, 8/16MB onboard, probably sdram only
|
|
5 -> same as above
|
|
6 -> 4x128Kx32 chips, 4MB onboard, probably sgram
|
|
7 -> 4x128Kx32 chips, 8MB onboard, probably sgram
|
|
G400: 0 -> 2x512Kx16 SDRAM, 16/32MB
|
|
2x512Kx32 SGRAM, 16/32MB
|
|
1 -> 2x256Kx32 SGRAM, 8/16MB
|
|
2 -> 4x128Kx32 SGRAM, 8/16MB
|
|
3 -> 4x512Kx32 SDRAM, 32MB
|
|
4 -> 4x256Kx32 SGRAM, 16/32MB
|
|
5 -> 2x1Mx32 SDRAM, 32MB
|
|
6 -> reserved
|
|
7 -> reserved
|
|
You should use sdram or sgram parameter in addition to memtype
|
|
parameter.
|
|
nomtrr - disables write combining on frame buffer. This slows down driver but
|
|
there is reported minor incompatibility between GUS DMA and XFree
|
|
under high loads if write combining is enabled (sound dropouts).
|
|
mtrr - enables write combining on frame buffer. It speeds up video accesses
|
|
much. It is default. You must have MTRR support enabled in kernel
|
|
and your CPU must have MTRR (f.e. Pentium II have them).
|
|
sgram - tells to driver that you have Gxx0 with SGRAM memory. It has no
|
|
effect without `init'.
|
|
sdram - tells to driver that you have Gxx0 with SDRAM memory.
|
|
It is a default.
|
|
inv24 - change timings parameters for 24bpp modes on Millennium and
|
|
Millennium II. Specify this if you see strange color shadows around
|
|
characters.
|
|
noinv24 - use standard timings. It is the default.
|
|
inverse - invert colors on screen (for LCD displays)
|
|
noinverse - show true colors on screen. It is default.
|
|
dev:X - bind driver to device X. Driver numbers device from 0 up to N,
|
|
where device 0 is first `known' device found, 1 second and so on.
|
|
lspci lists devices in this order.
|
|
Default is `every' known device.
|
|
nohwcursor - disables hardware cursor (use software cursor instead).
|
|
hwcursor - enables hardware cursor. It is default. If you are using
|
|
non-accelerated mode (`noaccel' or `fbset -accel false'), software
|
|
cursor is used (except for text mode).
|
|
noblink - disables cursor blinking. Cursor in text mode always blinks (hw
|
|
limitation).
|
|
blink - enables cursor blinking. It is default.
|
|
nofastfont - disables fastfont feature. It is default.
|
|
fastfont:X - enables fastfont feature. X specifies size of memory reserved for
|
|
font data, it must be >= (fontwidth*fontheight*chars_in_font)/8.
|
|
It is faster on Gx00 series, but slower on older cards.
|
|
grayscale - enable grayscale summing. It works in PSEUDOCOLOR modes (text,
|
|
4bpp, 8bpp). In DIRECTCOLOR modes it is limited to characters
|
|
displayed through putc/putcs. Direct accesses to framebuffer
|
|
can paint colors.
|
|
nograyscale - disable grayscale summing. It is default.
|
|
cross4MB - enables that pixel line can cross 4MB boundary. It is default for
|
|
non-Millennium.
|
|
nocross4MB - pixel line must not cross 4MB boundary. It is default for
|
|
Millennium I or II, because of these devices have hardware
|
|
limitations which do not allow this. But this option is
|
|
incompatible with some (if not all yet released) versions of
|
|
XF86_FBDev.
|
|
dfp - enables digital flat panel interface. This option is incompatible with
|
|
secondary (TV) output - if DFP is active, TV output must be
|
|
inactive and vice versa. DFP always uses same timing as primary
|
|
(monitor) output.
|
|
dfp:X - use settings X for digital flat panel interface. X is number from
|
|
0 to 0xFF, and meaning of each individual bit is described in
|
|
G400 manual, in description of DAC register 0x1F. For normal operation
|
|
you should set all bits to zero, except lowest bit. This lowest bit
|
|
selects who is source of display clocks, whether G400, or panel.
|
|
Default value is now read back from hardware - so you should specify
|
|
this value only if you are also using `init' parameter.
|
|
outputs:XYZ - set mapping between CRTC and outputs. Each letter can have value
|
|
of 0 (for no CRTC), 1 (CRTC1) or 2 (CRTC2), and first letter corresponds
|
|
to primary analog output, second letter to the secondary analog output
|
|
and third letter to the DVI output. Default setting is 100 for
|
|
cards below G400 or G400 without DFP, 101 for G400 with DFP, and
|
|
111 for G450 and G550. You can set mapping only on first card,
|
|
use matroxset for setting up other devices.
|
|
vesa:X - selects startup videomode. X is number from 0 to 0x1FF, see table
|
|
above for detailed explanation. Default is 640x480x8bpp if driver
|
|
has 8bpp support. Otherwise first available of 640x350x4bpp,
|
|
640x480x15bpp, 640x480x24bpp, 640x480x32bpp or 80x25 text
|
|
(80x25 text is always available).
|
|
|
|
If you are not satisfied with videomode selected by `vesa' option, you
|
|
can modify it with these options:
|
|
|
|
xres:X - horizontal resolution, in pixels. Default is derived from `vesa'
|
|
option.
|
|
yres:X - vertical resolution, in pixel lines. Default is derived from `vesa'
|
|
option.
|
|
upper:X - top boundary: lines between end of VSYNC pulse and start of first
|
|
pixel line of picture. Default is derived from `vesa' option.
|
|
lower:X - bottom boundary: lines between end of picture and start of VSYNC
|
|
pulse. Default is derived from `vesa' option.
|
|
vslen:X - length of VSYNC pulse, in lines. Default is derived from `vesa'
|
|
option.
|
|
left:X - left boundary: pixels between end of HSYNC pulse and first pixel.
|
|
Default is derived from `vesa' option.
|
|
right:X - right boundary: pixels between end of picture and start of HSYNC
|
|
pulse. Default is derived from `vesa' option.
|
|
hslen:X - length of HSYNC pulse, in pixels. Default is derived from `vesa'
|
|
option.
|
|
pixclock:X - dotclocks, in ps (picoseconds). Default is derived from `vesa'
|
|
option and from `fh' and `fv' options.
|
|
sync:X - sync. pulse - bit 0 inverts HSYNC polarity, bit 1 VSYNC polarity.
|
|
If bit 3 (value 0x08) is set, composite sync instead of HSYNC is
|
|
generated. If bit 5 (value 0x20) is set, sync on green is turned on.
|
|
Do not forget that if you want sync on green, you also probably
|
|
want composite sync.
|
|
Default depends on `vesa'.
|
|
depth:X - Bits per pixel: 0=text, 4,8,15,16,24 or 32. Default depends on
|
|
`vesa'.
|
|
|
|
If you know capabilities of your monitor, you can specify some (or all) of
|
|
`maxclk', `fh' and `fv'. In this case, `pixclock' is computed so that
|
|
pixclock <= maxclk, real_fh <= fh and real_fv <= fv.
|
|
|
|
maxclk:X - maximum dotclock. X can be specified in MHz, kHz or Hz. Default is
|
|
`don't care'.
|
|
fh:X - maximum horizontal synchronization frequency. X can be specified
|
|
in kHz or Hz. Default is `don't care'.
|
|
fv:X - maximum vertical frequency. X must be specified in Hz. Default is
|
|
70 for modes derived from `vesa' with yres <= 400, 60Hz for
|
|
yres > 400.
|
|
|
|
|
|
Limitations
|
|
===========
|
|
|
|
There are known and unknown bugs, features and misfeatures.
|
|
Currently there are following known bugs:
|
|
+ SVGALib does not restore screen on exit
|
|
+ generic fbcon-cfbX procedures do not work on Alphas. Due to this,
|
|
`noaccel' (and cfb4 accel) driver does not work on Alpha. So everyone
|
|
with access to /dev/fb* on Alpha can hang machine (you should restrict
|
|
access to /dev/fb* - everyone with access to this device can destroy
|
|
your monitor, believe me...).
|
|
+ 24bpp does not support correctly XF-FBDev on big-endian architectures.
|
|
+ interlaced text mode is not supported; it looks like hardware limitation,
|
|
but I'm not sure.
|
|
+ Gxx0 SGRAM/SDRAM is not autodetected.
|
|
+ If you are using more than one framebuffer device, you must boot kernel
|
|
with 'video=scrollback:0'.
|
|
+ maybe more...
|
|
And following misfeatures:
|
|
+ SVGALib does not restore screen on exit.
|
|
+ pixclock for text modes is limited by hardware to
|
|
83 MHz on G200
|
|
66 MHz on Millennium I
|
|
60 MHz on Millennium II
|
|
Because I have no access to other devices, I do not know specific
|
|
frequencies for them. So driver does not check this and allows you to
|
|
set frequency higher that this. It causes sparks, black holes and other
|
|
pretty effects on screen. Device was not destroyed during tests. :-)
|
|
+ my Millennium G200 oscillator has frequency range from 35 MHz to 380 MHz
|
|
(and it works with 8bpp on about 320 MHz dotclocks (and changed mclk)).
|
|
But Matrox says on product sheet that VCO limit is 50-250 MHz, so I believe
|
|
them (maybe that chip overheats, but it has a very big cooler (G100 has
|
|
none), so it should work).
|
|
+ special mixed video/graphics videomodes of Mystique and Gx00 - 2G8V16 and
|
|
G16V16 are not supported
|
|
+ color keying is not supported
|
|
+ feature connector of Mystique and Gx00 is set to VGA mode (it is disabled
|
|
by BIOS)
|
|
+ DDC (monitor detection) is supported through dualhead driver
|
|
+ some check for input values are not so strict how it should be (you can
|
|
specify vslen=4000 and so on).
|
|
+ maybe more...
|
|
And following features:
|
|
+ 4bpp is available only on Millennium I and Millennium II. It is hardware
|
|
limitation.
|
|
+ selection between 1:5:5:5 and 5:6:5 16bpp videomode is done by -rgba
|
|
option of fbset: "fbset -depth 16 -rgba 5,5,5" selects 1:5:5:5, anything
|
|
else selects 5:6:5 mode.
|
|
+ text mode uses 6 bit VGA palette instead of 8 bit (one of 262144 colors
|
|
instead of one of 16M colors). It is due to hardware limitation of
|
|
Millennium I/II and SVGALib compatibility.
|
|
|
|
|
|
Benchmarks
|
|
==========
|
|
It is time to redraw whole screen 1000 times in 1024x768, 60Hz. It is
|
|
time for draw 6144000 characters on screen through /dev/vcsa
|
|
(for 32bpp it is about 3GB of data (exactly 3000 MB); for 8x16 font in
|
|
16 seconds, i.e. 187 MBps).
|
|
Times were obtained from one older version of driver, now they are about 3%
|
|
faster, it is kernel-space only time on P-II/350 MHz, Millennium I in 33 MHz
|
|
PCI slot, G200 in AGP 2x slot. I did not test vgacon.
|
|
|
|
NOACCEL
|
|
8x16 12x22
|
|
Millennium I G200 Millennium I G200
|
|
8bpp 16.42 9.54 12.33 9.13
|
|
16bpp 21.00 15.70 19.11 15.02
|
|
24bpp 36.66 36.66 35.00 35.00
|
|
32bpp 35.00 30.00 33.85 28.66
|
|
|
|
ACCEL, nofastfont
|
|
8x16 12x22 6x11
|
|
Millennium I G200 Millennium I G200 Millennium I G200
|
|
8bpp 7.79 7.24 13.55 7.78 30.00 21.01
|
|
16bpp 9.13 7.78 16.16 7.78 30.00 21.01
|
|
24bpp 14.17 10.72 18.69 10.24 34.99 21.01
|
|
32bpp 16.15 16.16 18.73 13.09 34.99 21.01
|
|
|
|
ACCEL, fastfont
|
|
8x16 12x22 6x11
|
|
Millennium I G200 Millennium I G200 Millennium I G200
|
|
8bpp 8.41 6.01 6.54 4.37 16.00 10.51
|
|
16bpp 9.54 9.12 8.76 6.17 17.52 14.01
|
|
24bpp 15.00 12.36 11.67 10.00 22.01 18.32
|
|
32bpp 16.18 18.29* 12.71 12.74 24.44 21.00
|
|
|
|
TEXT
|
|
8x16
|
|
Millennium I G200
|
|
TEXT 3.29 1.50
|
|
|
|
* Yes, it is slower than Millennium I.
|
|
|
|
|
|
Dualhead G400
|
|
=============
|
|
Driver supports dualhead G400 with some limitations:
|
|
+ secondary head shares videomemory with primary head. It is not problem
|
|
if you have 32MB of videoram, but if you have only 16MB, you may have
|
|
to think twice before choosing videomode (for example twice 1880x1440x32bpp
|
|
is not possible).
|
|
+ due to hardware limitation, secondary head can use only 16 and 32bpp
|
|
videomodes.
|
|
+ secondary head is not accelerated. There were bad problems with accelerated
|
|
XFree when secondary head used to use acceleration.
|
|
+ secondary head always powerups in 640x480@60-32 videomode. You have to use
|
|
fbset to change this mode.
|
|
+ secondary head always powerups in monitor mode. You have to use fbmatroxset
|
|
to change it to TV mode. Also, you must select at least 525 lines for
|
|
NTSC output and 625 lines for PAL output.
|
|
+ kernel is not fully multihead ready. So some things are impossible to do.
|
|
+ if you compiled it as module, you must insert i2c-matroxfb, matroxfb_maven
|
|
and matroxfb_crtc2 into kernel.
|
|
|
|
|
|
Dualhead G450
|
|
=============
|
|
Driver supports dualhead G450 with some limitations:
|
|
+ secondary head shares videomemory with primary head. It is not problem
|
|
if you have 32MB of videoram, but if you have only 16MB, you may have
|
|
to think twice before choosing videomode.
|
|
+ due to hardware limitation, secondary head can use only 16 and 32bpp
|
|
videomodes.
|
|
+ secondary head is not accelerated.
|
|
+ secondary head always powerups in 640x480@60-32 videomode. You have to use
|
|
fbset to change this mode.
|
|
+ TV output is not supported
|
|
+ kernel is not fully multihead ready, so some things are impossible to do.
|
|
+ if you compiled it as module, you must insert matroxfb_g450 and matroxfb_crtc2
|
|
into kernel.
|
|
|
|
--
|
|
Petr Vandrovec <vandrove@vc.cvut.cz>
|