fbdev: remove cyblafb driver

A tridentfb driver has all the functionality of the cyblafb driver without
the bugs of the latter.

Changes to the tridentfb driver:

- FBINFO_READS_FAST added to the tridentfb.  The cyblafb used a blitter
  for scrolling which is faster than color expansion on Cyberblade
  chipsets.  The blitter is slower on a discrete Blade3D core.  Use the
  blitter for scrolling in the tridentfb only for integrated Blade3D
  cores.  Now, scrolling speed is about equal for the tridentfb and the
  cyblafb.

- a copyright notice addition is done on request of Jani Monoses (the
  first author of the tridentfb).

Tested on AGP Blade3D card and PCChips
M787CLR motherboard: VIA C3 cpu +
VT8601 north  bridge (aka Cyberblade/i1).

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: "Jani Monoses" <jani@ubuntu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

10 files changed, 0 insertions, 634 deletions

diff --git a/Documentation/fb/00-INDEX b/Documentation/fb/00-INDEX
index caabbd395e61..a618fd99c9f0 100644
--- a/Documentation/fb/00-INDEX
+++ b/Documentation/fb/00-INDEX
@@ -11,8 +11,6 @@ aty128fb.txt
 	- info on the ATI Rage128 frame buffer driver.
 cirrusfb.txt
 	- info on the driver for Cirrus Logic chipsets.
-cyblafb/
-	- directory with documentation files related to the cyblafb driver.
 deferred_io.txt
 	- an introduction to deferred IO.
 fbcon.txt
diff --git a/Documentation/fb/cyblafb/bugs b/Documentation/fb/cyblafb/bugs
deleted file mode 100644
index 9443a6d72cdd..000000000000
--- a/Documentation/fb/cyblafb/bugs
+++ /dev/null
@@ -1,13 +0,0 @@
-Bugs
-====
-
-I currently don't know of any bug. Please do send reports to:
- - linux-fbdev-devel@lists.sourceforge.net
- - Knut_Petersen@t-online.de.
-
-
-Untested features
-=================
-
-All LCD stuff is untested. If it worked in tridentfb, it should work in
-cyblafb. Please test and report the results to Knut_Petersen@t-online.de.
diff --git a/Documentation/fb/cyblafb/credits b/Documentation/fb/cyblafb/credits
deleted file mode 100644
index 0eb3b443dc2b..000000000000
--- a/Documentation/fb/cyblafb/credits
+++ /dev/null
@@ -1,7 +0,0 @@
-Thanks to
-=========
-   * 	Alan Hourihane, for writing the X trident driver
-   *	Jani Monoses, for writing the tridentfb driver
-   *	Antonino A. Daplas, for review of the first published
-	version of cyblafb and some code
-   *	Jochen Hein, for testing and a helpfull bug report
diff --git a/Documentation/fb/cyblafb/documentation b/Documentation/fb/cyblafb/documentation
deleted file mode 100644
index bb1aac048425..000000000000
--- a/Documentation/fb/cyblafb/documentation
+++ /dev/null
@@ -1,17 +0,0 @@
-Available Documentation
-=======================
-
-Apollo PLE 133 Chipset VT8601A North Bridge Datasheet, Rev. 1.82, October 22,
-2001, available from VIA:
-
-	http://www.viavpsd.com/product/6/15/DS8601A182.pdf
-
-The datasheet is incomplete, some registers that need to be programmed are not
-explained at all and important bits are listed as "reserved". But you really
-need the datasheet to understand the code.  "p. xxx" comments refer to page
-numbers of this document.
-
-XFree/XOrg drivers are available and of good quality, looking at the code
-there is a good idea if the datasheet does not provide enough information
-or if the datasheet seems to be wrong.
-
diff --git a/Documentation/fb/cyblafb/fb.modes b/Documentation/fb/cyblafb/fb.modes
deleted file mode 100644
index fe0e5223ba86..000000000000
--- a/Documentation/fb/cyblafb/fb.modes
+++ /dev/null
@@ -1,154 +0,0 @@
-#
-#   Sample fb.modes file
-#
-#	Provides an incomplete list of working modes for
-#	the cyberblade/i1 graphics core.
-#
-#	The value 4294967256 is used instead of -40. Of course, -40 is not
-#	a really reasonable value, but chip design does not always follow
-#	logic. Believe me, it's ok, and it's the way the BIOS does it.
-#
-#	fbset requires 4294967256 in fb.modes and -40 as an argument to
-#	the -t parameter. That's also not too reasonable, and it might change
-#	in the future or might even be differt for your current version.
-#
-
-mode "640x480-50"
-    geometry 640 480 2048 4096 8
-    timings 47619 4294967256 24 17 0 216 3
-endmode
-
-mode "640x480-60"
-    geometry 640 480 2048 4096 8
-    timings 39682 4294967256 24 17 0 216 3
-endmode
-
-mode "640x480-70"
-    geometry 640 480 2048 4096 8
-    timings 34013 4294967256 24 17 0 216 3
-endmode
-
-mode "640x480-72"
-    geometry 640 480 2048 4096 8
-    timings 33068 4294967256 24 17 0 216 3
-endmode
-
-mode "640x480-75"
-    geometry 640 480 2048 4096 8
-    timings 31746 4294967256 24 17 0 216 3
-endmode
-
-mode "640x480-80"
-    geometry 640 480 2048 4096 8
-    timings 29761 4294967256 24 17 0 216 3
-endmode
-
-mode "640x480-85"
-    geometry 640 480 2048 4096 8
-    timings 28011 4294967256 24 17 0 216 3
-endmode
-
-mode "800x600-50"
-    geometry 800 600 2048 4096 8
-    timings 30303 96 24 14 0 136 11
-endmode
-
-mode "800x600-60"
-    geometry 800 600 2048 4096 8
-    timings 25252 96 24 14 0 136 11
-endmode
-
-mode "800x600-70"
-    geometry 800 600 2048 4096 8
-    timings 21645 96 24 14 0 136 11
-endmode
-
-mode "800x600-72"
-    geometry 800 600 2048 4096 8
-    timings 21043 96 24 14 0 136 11
-endmode
-
-mode "800x600-75"
-    geometry 800 600 2048 4096 8
-    timings 20202 96 24 14 0 136 11
-endmode
-
-mode "800x600-80"
-    geometry 800 600 2048 4096 8
-    timings 18939 96 24 14 0 136 11
-endmode
-
-mode "800x600-85"
-    geometry 800 600 2048 4096 8
-    timings 17825 96 24 14 0 136 11
-endmode
-
-mode "1024x768-50"
-    geometry 1024 768 2048 4096 8
-    timings 19054 144 24 29 0 120 3
-endmode
-
-mode "1024x768-60"
-    geometry 1024 768 2048 4096 8
-    timings 15880 144 24 29 0 120 3
-endmode
-
-mode "1024x768-70"
-    geometry 1024 768 2048 4096 8
-    timings 13610 144 24 29 0 120 3
-endmode
-
-mode "1024x768-72"
-    geometry 1024 768 2048 4096 8
-    timings 13232 144 24 29 0 120 3
-endmode
-
-mode "1024x768-75"
-    geometry 1024 768 2048 4096 8
-    timings 12703 144 24 29 0 120 3
-endmode
-
-mode "1024x768-80"
-    geometry 1024 768 2048 4096 8
-    timings 11910 144 24 29 0 120 3
-endmode
-
-mode "1024x768-85"
-    geometry 1024 768 2048 4096 8
-    timings 11209 144 24 29 0 120 3
-endmode
-
-mode "1280x1024-50"
-    geometry 1280 1024 2048 4096 8
-    timings 11114 232 16 39 0 160 3
-endmode
-
-mode "1280x1024-60"
-    geometry 1280 1024 2048 4096 8
-    timings 9262 232 16 39 0 160 3
-endmode
-
-mode "1280x1024-70"
-    geometry 1280 1024 2048 4096 8
-    timings 7939 232 16 39 0 160 3
-endmode
-
-mode "1280x1024-72"
-    geometry 1280 1024 2048 4096 8
-    timings 7719 232 16 39 0 160 3
-endmode
-
-mode "1280x1024-75"
-    geometry 1280 1024 2048 4096 8
-    timings 7410 232 16 39 0 160 3
-endmode
-
-mode "1280x1024-80"
-    geometry 1280 1024 2048 4096 8
-    timings 6946 232 16 39 0 160 3
-endmode
-
-mode "1280x1024-85"
-    geometry 1280 1024 2048 4096 8
-    timings 6538 232 16 39 0 160 3
-endmode
diff --git a/Documentation/fb/cyblafb/performance b/Documentation/fb/cyblafb/performance
deleted file mode 100644
index 8d15d5dfc6b3..000000000000
--- a/Documentation/fb/cyblafb/performance
+++ /dev/null
@@ -1,79 +0,0 @@
-Speed
-=====
-
-CyBlaFB is much faster than tridentfb and vesafb. Compare the performance data
-for mode 1280x1024-[8,16,32]@61 Hz.
-
-Test 1: Cat a file with 2000 lines of 0 characters.
-Test 2: Cat a file with 2000 lines of 80 characters.
-Test 3: Cat a file with 2000 lines of 160 characters.
-
-All values show system time use in seconds, kernel 2.6.12 was used for
-the measurements. 2.6.13 is a bit slower, 2.6.14 hopefully will include a
-patch that speeds up kernel bitblitting a lot ( > 20%).
-
-+-----------+-----------------------------------------------------+
-|	    |			not accelerated 		  |
-| TRIDENTFB +-----------------+-----------------+-----------------+
-| of 2.6.12 |	   8 bpp      |     16 bpp	|     32 bpp	  |
-|	    | noypan |	 ypan | noypan |   ypan | noypan |   ypan |
-+-----------+--------+--------+--------+--------+--------+--------+
-|    Test 1 |	4.31 |	 4.33 |   6.05 |  12.81 |  ----  |  ----  |
-|    Test 2 |  67.94 |	 5.44 | 123.16 |  14.79 |  ----  |  ----  |
-|    Test 3 | 131.36 |	 6.55 | 240.12 |  16.76 |  ----  |  ----  |
-+-----------+--------+--------+--------+--------+--------+--------+
-|  Comments |		      | 		| completely bro- |
-|	    |		      | 		| ken, monitor	  |
-|	    |		      | 		| switches off	  |
-+-----------+-----------------+-----------------+-----------------+
-
-
-+-----------+-----------------------------------------------------+
-|	    |			  accelerated			  |
-| TRIDENTFB +-----------------+-----------------+-----------------+
-| of 2.6.12 |	   8 bpp      |     16 bpp	|     32 bpp	  |
-|	    | noypan |	 ypan | noypan |   ypan | noypan |   ypan |
-+-----------+--------+--------+--------+--------+--------+--------+
-|    Test 1 |  ----  |	----  |  20.62 |   1.22 |  ----  |  ----  |
-|    Test 2 |  ----  |	----  |  22.61 |   3.19 |  ----  |  ----  |
-|    Test 3 |  ----  |	----  |  24.59 |   5.16 |  ----  |  ----  |
-+-----------+--------+--------+--------+--------+--------+--------+
-|  Comments | broken, writing | broken, ok only | completely bro- |
-|	    | to wrong places | if bgcolor is	| ken, monitor	  |
-|	    | on screen + bug | black, bug in	| switches off	  |
-|	    | in fillrect()   | fillrect()	|		  |
-+-----------+-----------------+-----------------+-----------------+
-
-
-+-----------+-----------------------------------------------------+
-|	    |			not accelerated 		  |
-|   VESAFB  +-----------------+-----------------+-----------------+
-| of 2.6.12 |	   8 bpp      |     16 bpp	|     32 bpp	  |
-|	    | noypan |	 ypan | noypan |   ypan | noypan |   ypan |
-+-----------+--------+--------+--------+--------+--------+--------+
-|    Test 1 |	4.26 |	 3.76 |   5.99 |   7.23 |  ----  |  ----  |
-|    Test 2 |  65.65 |	 4.89 | 120.88 |   9.08 |  ----  |  ----  |
-|    Test 3 | 126.91 |	 5.94 | 235.77 |  11.03 |  ----  |  ----  |
-+-----------+--------+--------+--------+--------+--------+--------+
-|  Comments | vga=0x307       | vga=0x31a	| vga=0x31b not   |
-|	    | fh=80kHz	      | fh=80kHz	| supported by	  |
-|	    | fv=75kHz	      | fv=75kHz	| video BIOS and  |
-|	    |		      | 		| hardware	  |
-+-----------+-----------------+-----------------+-----------------+
-
-
-+-----------+-----------------------------------------------------+
-|	    |			  accelerated			  |
-|  CYBLAFB  +-----------------+-----------------+-----------------+
-|	    |	   8 bpp      |     16 bpp	|     32 bpp	  |
-|	    | noypan |	 ypan | noypan |   ypan | noypan |   ypan |
-+-----------+--------+--------+--------+--------+--------+--------+
-|    Test 1 |	8.02 |	 0.23 |  19.04 |   0.61 |  57.12 |   2.74 |
-|    Test 2 |	8.38 |	 0.55 |  19.39 |   0.92 |  57.54 |   3.13 |
-|    Test 3 |	8.73 |	 0.86 |  19.74 |   1.24 |  57.95 |   3.51 |
-+-----------+--------+--------+--------+--------+--------+--------+
-|  Comments |		      | 		|		  |
-|	    |		      | 		|		  |
-|	    |		      | 		|		  |
-|	    |		      | 		|		  |
-+-----------+-----------------+-----------------+-----------------+
diff --git a/Documentation/fb/cyblafb/todo b/Documentation/fb/cyblafb/todo
deleted file mode 100644
index c5f6d0eae545..000000000000
--- a/Documentation/fb/cyblafb/todo
+++ /dev/null
@@ -1,31 +0,0 @@
-TODO / Missing features
-=======================
-
-Verify LCD stuff		"stretch" and "center" options are
-				completely untested ... this code needs to be
-				verified. As I don't have access to such
-				hardware, please contact me if you are
-				willing run some tests.
-
-Interlaced video modes		The reason that interleaved
-				modes are disabled is that I do not know
-				the meaning of the vertical interlace
-				parameter. Also the datasheet mentions a
-				bit d8 of a horizontal interlace parameter,
-				but nowhere the lower 8 bits. Please help
-				if you can.
-
-low-res double scan modes	Who needs it?
-
-accelerated color blitting	Who needs it? The console driver does use color
-				blitting for nothing but drawing the penguine,
-				everything else is done using color expanding
-				blitting of 1bpp character bitmaps.
-
-ioctls				Who needs it?
-
-TV-out				Will be done later. Use "vga= " at boot time
-				to set a suitable video mode.
-
-???				Feel free to contact me if you have any
-				feature requests
diff --git a/Documentation/fb/cyblafb/usage b/Documentation/fb/cyblafb/usage
deleted file mode 100644
index a39bb3d402a2..000000000000
--- a/Documentation/fb/cyblafb/usage
+++ /dev/null
@@ -1,217 +0,0 @@
-CyBlaFB is a framebuffer driver for the Cyberblade/i1 graphics core integrated
-into the VIA Apollo PLE133 (aka vt8601) south bridge. It is developed and
-tested using a VIA EPIA 5000 board.
-
-Cyblafb - compiled into the kernel or as a module?
-==================================================
-
-You might compile cyblafb either as a module or compile it permanently into the
-kernel.
-
-Unless you have a real reason to do so you should not compile both vesafb and
-cyblafb permanently into the kernel. It's possible and it helps during the
-developement cycle, but it's useless and will at least block some otherwise
-usefull memory for ordinary users.
-
-Selecting Modes
-===============
-
-	Startup Mode
-	============
-
-	First of all, you might use the "vga=???" boot parameter as it is
-	documented in vesafb.txt and svga.txt. Cyblafb will detect the video
-	mode selected and will use the geometry and timings found by
-	inspecting the hardware registers.
-
-		video=cyblafb vga=0x317
-
-	Alternatively you might use a combination of the mode, ref and bpp
-	parameters. If you compiled the driver into the kernel, add something
-	like this to the kernel command line:
-
-		video=cyblafb:1280x1024,bpp=16,ref=50 ...
-
-	If you compiled the driver as a module, the same mode would be
-	selected by the following command:
-
-		modprobe cyblafb mode=1280x1024 bpp=16 ref=50 ...
-
-	None of the modes possible to select as startup modes are affected by
-	the problems described at the end of the next subsection.
-
-	For all startup modes cyblafb chooses a virtual x resolution of 2048,
-	the only exception is mode 1280x1024 in combination with 32 bpp. This
-	allows ywrap scrolling for all those modes if rotation is 0 or 2, and
-	also fast scrolling if rotation is 1 or 3. The default virtual y reso-
-	lution is 4096 for bpp == 8, 2048 for bpp==16 and 1024 for bpp == 32,
-	again with the only exception of 1280x1024 at 32 bpp.
-
-	Please do set your video memory size to 8 Mb in the Bios setup. Other
-	values will work, but performace is decreased for a lot of modes.
-
-	Mode changes using fbset
-	========================
-
-	You might use fbset to change the video mode, see "man fbset". Cyblafb
-	generally does assume that you know what you are doing. But it does
-	some checks, especially those that are needed to prevent you from
-	damaging your hardware.
-
-		- only 8, 16, 24 and 32 bpp video modes are accepted
-		- interlaced video modes are not accepted
-		- double scan video modes are not accepted
-		- if a flat panel is found, cyblafb does not allow you
-		  to program a resolution higher than the physical
-		  resolution of the flat panel monitor
-		- cyblafb does not allow vclk to exceed 230 MHz. As 32 bpp
-		  and (currently) 24 bit modes use a doubled vclk internally,
-		  the dotclock limit as seen by fbset is 115 MHz for those
-		  modes and 230 MHz for 8 and 16 bpp modes.
-		- cyblafb will allow you to select very high resolutions as
-		  long as the hardware can be programmed to these modes. The
-		  documented limit 1600x1200 is not enforced, but don't expect
-		  perfect signal quality.
-
-	Any request that violates the rules given above will be either changed
-	to something the hardware supports or an error value will be returned.
-
-	If you program a virtual y resolution higher than the hardware limit,
-	cyblafb will silently decrease that value to the highest possible
-	value. The same is true for a virtual x resolution that is not
-	supported by the hardware. Cyblafb tries to adapt vyres first because
-	vxres decides if ywrap scrolling is possible or not.
-
-	Attempts to disable acceleration are ignored, I believe that this is
-	safe.
-
-	Some video modes that should work do not work as expected. If you use
-	the standard fb.modes, fbset 640x480-60 will program that mode, but
-	you will see a vertical area, about two characters wide, with only
-	much darker characters than the other characters on the screen.
-	Cyblafb does allow that mode to be set, as it does not violate the
-	official specifications. It would need a lot of code to reliably sort
-	out all invalid modes, playing around with the margin values will
-	give a valid mode quickly. And if cyblafb would detect such an invalid
-	mode, should it silently alter the requested values or should it
-	report an error? Both options have some pros and cons. As stated
-	above, none of the startup modes are affected, and if you set
-	verbosity to 1 or higher, cyblafb will print the fbset command that
-	would be needed to program that mode using fbset.
-
-
-Other Parameters
-================
-
-
-crt		don't autodetect, assume monitor connected to
-		standard VGA connector
-
-fp		don't autodetect, assume flat panel display
-		connected to flat panel monitor interface
-
-nativex 	inform driver about native x resolution of
-		flat panel monitor connected to special
-		interface (should be autodetected)
-
-stretch 	stretch image to adapt low resolution modes to
-		higer resolutions of flat panel monitors
-		connected to special interface
-
-center		center image to adapt low resolution modes to
-		higer resolutions of flat panel monitors
-		connected to special interface
-
-memsize 	use if autodetected memsize is wrong ...
-		should never be necessary
-
-nopcirr 	disable PCI read retry
-nopciwr 	disable PCI write retry
-nopcirb 	disable PCI read bursts
-nopciwb 	disable PCI write bursts
-
-bpp		bpp for specified modes
-		valid values: 8 || 16 || 24 || 32
-
-ref		refresh rate for specified mode
-		valid values: 50 <= ref <= 85
-
-mode		640x480 or 800x600 or 1024x768 or 1280x1024
-		if not specified, the startup mode will be detected
-		and used, so you might also use the vga=??? parameter
-		described in vesafb.txt. If you do not specify a mode,
-		bpp and ref parameters are ignored.
-
-verbosity	0 is the default, increase to at least 2 for every
-		bug report!
-
-Development hints
-=================
-
-It's much faster do compile a module and to load the new version after
-unloading the old module than to compile a new kernel and to reboot. So if you
-try to work on cyblafb, it might be a good idea to use cyblafb as a module.
-In real life, fast often means dangerous, and that's also the case here. If
-you introduce a serious bug when cyblafb is compiled into the kernel, the
-kernel will lock or oops with a high probability before the file system is
-mounted, and the danger for your data is low. If you load a broken own version
-of cyblafb on a running system, the danger for the integrity of the file
-system is much higher as you might need a hard reset afterwards. Decide
-yourself.
-
-Module unloading, the vfb method
-================================
-
-If you want to unload/reload cyblafb using the virtual framebuffer, you need
-to enable vfb support in the kernel first. After that, load the modules as
-shown below:
-
-	modprobe vfb vfb_enable=1
-	modprobe fbcon
-	modprobe cyblafb
-	fbset -fb /dev/fb1 1280x1024-60 -vyres 2662
-	con2fb /dev/fb1 /dev/tty1
-	...
-
-If you now made some changes to cyblafb and want to reload it, you might do it
-as show below:
-
-	con2fb /dev/fb0 /dev/tty1
-	...
-	rmmod cyblafb
-	modprobe cyblafb
-	con2fb /dev/fb1 /dev/tty1
-	...
-
-Of course, you might choose another mode, and most certainly you also want to
-map some other /dev/tty* to the real framebuffer device. You might also choose
-to compile fbcon as a kernel module or place it permanently in the kernel.
-
-I do not know of any way to unload fbcon, and fbcon will prevent the
-framebuffer device loaded first from unloading. [If there is a way, then
-please add a description here!]
-
-Module unloading, the vesafb method
-===================================
-
-Configure the kernel:
-
-	<*> Support for frame buffer devices
-	[*]   VESA VGA graphics support
-	<M>   Cyberblade/i1 support
-
-Add e.g. "video=vesafb:ypan vga=0x307" to the kernel parameters. The ypan
-parameter is important, choose any vga parameter you like as long as it is
-a graphics mode.
-
-After booting, load cyblafb without any mode and bpp parameter and assign
-cyblafb to individual ttys using con2fb, e.g.:
-
-	modprobe cyblafb
-	con2fb /dev/fb1 /dev/tty1
-
-Unloading cyblafb works without problems after you assign vesafb to all
-ttys again, e.g.:
-
-	con2fb /dev/fb0 /dev/tty1
-	rmmod cyblafb
diff --git a/Documentation/fb/cyblafb/whatsnew b/Documentation/fb/cyblafb/whatsnew
deleted file mode 100644
index 76c07a26e044..000000000000
--- a/Documentation/fb/cyblafb/whatsnew
+++ /dev/null
@@ -1,29 +0,0 @@
-0.62
-====
-
-      - the vesafb parameter has been removed as I decided to allow the
-      	feature without any special parameter.
-
-      - Cyblafb does not use the vga style of panning any longer, now the
-      	"right view" register in the graphics engine IO space is used. Without
-	that change it was impossible to use all available memory, and without
-	access to all available memory it is impossible to ywrap.
-
-      - The imageblit function now uses hardware acceleration for all font
-        widths. Hardware blitting across pixel column 2048 is broken in the
-	cyberblade/i1 graphics core, but we work around that hardware bug.
-
-      - modes with vxres != xres are supported now.
-
-      - ywrap scrolling is supported now and the default. This is a big
-        performance gain.
-
-      - default video modes use vyres > yres and vxres > xres to allow
-        almost optimal scrolling speed for normal and rotated screens
-
-      - some features mainly usefull for debugging the upper layers of the
-        framebuffer system have been added, have a look at the code
-
-      - fixed: Oops after unloading cyblafb when reading /proc/io*
-
-      - we work around some bugs of the higher framebuffer layers.
diff --git a/Documentation/fb/cyblafb/whycyblafb b/Documentation/fb/cyblafb/whycyblafb
deleted file mode 100644
index a123bc11e698..000000000000
--- a/Documentation/fb/cyblafb/whycyblafb
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-I tried the following framebuffer drivers:
-
-	- TRIDENTFB is full of bugs. Acceleration is broken for Blade3D
-	  graphics cores like the cyberblade/i1. It claims to support a great
-	  number of devices, but documentation for most of these devices is
-	  unfortunately not available. There is _no_ reason to use tridentfb
-	  for cyberblade/i1 + CRT users. VESAFB is faster, and the one
-	  advantage, mode switching, is broken in tridentfb.
-
-	- VESAFB is used by many distributions as a standard. Vesafb does
-	  not support mode switching. VESAFB is a bit faster than the working
-	  configurations of TRIDENTFB, but it is still too slow, even if you
-	  use ypan.
-
-	- EPIAFB (you'll find it on sourceforge) supports the Cyberblade/i1
-	  graphics core, but it still has serious bugs and developement seems
-	  to have stopped. This is the one driver with TV-out support. If you
-	  do need this feature, try epiafb.
-
-None of these drivers was a real option for me.
-
-I believe that is unreasonable to change code that announces to support 20
-devices if I only have more or less sufficient documentation for exactly one
-of these. The risk of breaking device foo while fixing device bar is too high.
-
-So I decided to start CyBlaFB as a stripped down tridentfb.
-
-All code specific to other Trident chips has been removed. After that there
-were a lot of cosmetic changes to increase the readability of the code. All
-register names were changed to those mnemonics used in the datasheet. Function
-and macro names were changed if they hindered easy understanding of the code.
-
-After that I debugged the code and implemented some new features. I'll try to
-give a little summary of the main changes:
-
-	- calculation of vertical and horizontal timings was fixed
-
-	- video signal quality has been improved dramatically
-
-	- acceleration:
-
-		- fillrect and copyarea were fixed and reenabled
-
-		- color expanding imageblit was newly implemented, color
-		  imageblit (only used to draw the penguine) still uses the
-		  generic code.
-
-		- init of the acceleration engine was improved and moved to a
-		  place where it really works ...
-
-		- sync function has a timeout now and tries to reset and
-		  reinit the accel engine if necessary
-
-		- fewer slow copyarea calls when doing ypan scrolling by using
-		  undocumented bit d21 of screen start address stored in
-		  CR2B[5]. BIOS does use it also, so this should be safe.
-
-	- cyblafb rejects any attempt to set modes that would cause vclk
-	  values above reasonable 230 MHz. 32bit modes use a clock
-	  multiplicator of 2, so fbset does show the correct values for
-	  pixclock but not for vclk in this case. The fbset limit is 115 MHz
-	  for 32 bpp modes.
-
-	- cyblafb rejects modes known to be broken or unimplemented (all
-	  interlaced modes, all doublescan modes for now)
-
-	- cyblafb now works independant of the video mode in effect at startup
-	  time (tridentfb does not init all needed registers to reasonable
-	  values)
-
-	- switching between video modes does work reliably now
-
-	- the first video mode now is the one selected on startup using the
-	  vga=???? mechanism or any of
-		- 640x480, 800x600, 1024x768, 1280x1024
-		- 8, 16, 24 or 32 bpp
-		- refresh between 50 Hz and 85 Hz, 1 Hz steps (1280x1024-32
-		  is limited to 63Hz)
-
-	- pci retry and pci burst mode are settable (try to disable if you
-	  experience latency problems)
-
-	- built as a module cyblafb might be unloaded and reloaded using
-	  the vfb module and con2vt or might be used together with vesafb
-