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+[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 Millenium and
+ Millenium 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 for driver with multihead support
+ and first working device (usually dev:0) for driver without
+ multihead support.
+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-Millenium.
+nocross4MB - pixel line must not cross 4MB boundary. It is default for
+ Millenium 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>