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+/****************************************************************************
+**
+** Windowsystem-specific pages
+**
+** Copyright (C) 2000-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
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+** and the KDE Free Qt Foundation.
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+** This file may be used under the terms of the Q Public License as
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+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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+** herein.
+**
+**********************************************************************/
+
+/*!
+\page emb-framebuffer-howto.html
+
+\title Enabling the Linux Framebuffer
+
+This is only a short guide.
+See \l file:/usr/src/linux/README and
+\l file:/usr/src/linux/Documentation/fb/ for detailed information.
+There is also a detailed explanation at
+\l http://www.linuxdoc.org/HOWTO/Framebuffer-HOWTO.html.
+
+\list 1
+\i Make sure that you have the Linux kernel source code in
+\l file:/usr/src/linux/.
+
+\i Log in as root and \c cd \c /usr/src/linux
+
+\i Configure the kernel:
+   
+   Run:
+\code
+    make menuconfig
+\endcode
+
+   Select "Code maturity level options" and set "Prompt for
+   development and/or incomplete code/drivers".
+
+   Then select "Console drivers" and set "Support for frame buffer
+   devices" to built-in (even if it says EXPERIMENTAL). Then configure
+   the driver. Most modern graphics cards can use the "VESA VGA
+   graphics console"; use that or a driver that specifically matches
+   your video card. Finally, enable "Advanced low level driver options"
+   and make sure that 16 and 32 bpp packed pixel support are enabled. 
+
+   When you are finished, chose exit and save.
+
+\i Compile the kernel
+
+   First do:
+\code
+    make dep
+\endcode
+   then:
+\code
+    make bzImage
+\endcode
+
+  The new kernel should now be in arch/i386/boot/bzImage.
+
+\i Copy the kernel to the boot directory:
+\code
+    cp arch/i386/boot/bzImage /boot/linux.vesafb
+\endcode
+
+\i Edit /etc/lilo.conf.
+
+  \warning Keep a backup of \l file:/etc/lilo.conf, and have a rescue disk
+  available. If you make a mistake, the machine may not boot.
+
+   The file \l file:/etc/lilo.conf specifies how the system boots. The
+   precise contents of the file varies from system to system. Here is
+   an example:
+\code
+# LILO configuration file
+boot = /dev/hda3
+delay = 30 
+image = /boot/vmlinuz
+  root = /dev/hda3
+  label = Linux
+  read-only # Non-UMSDOS filesystems should be mounted read-only for checking
+other=/dev/hda1
+	label=nt
+	table=/dev/hda
+\endcode
+
+  Make a new "image" section that is a copy of the first one, but with
+\code
+  image = /boot/linux.vesafb 
+\endcode
+  and 
+\code
+  label = Linux-vesafb
+\endcode
+  Place it just above the first image section.
+
+  Add a line before the image section saying \c{vga = 791}. (Meaning
+  1024x768, 16 bpp.) 
+
+  With the above example, lilo.conf would now be:
+\code
+# LILO configuration file
+boot = /dev/hda3
+delay = 30 
+vga = 791
+image = /boot/linux.vesafb
+  root = /dev/hda3
+  label = Linux-vesafb
+  read-only # Non-UMSDOS filesystems should be mounted read-only for checking
+image = /boot/vmlinuz
+  root = /dev/hda3
+  label = Linux
+  read-only # Non-UMSDOS filesystems should be mounted read-only for checking
+other=/dev/hda1
+	label=nt
+	table=/dev/hda
+\endcode
+
+Do not change any existing lines in the file; just add new ones.
+
+\i To make the new changes take effect, run the lilo program:
+\code
+    lilo
+\endcode
+
+\i Reboot the system. You should now see a penguin logo while the
+   system is booting.
+   (Or more than one on a multi-processor machine.)
+
+\i If it does not boot properly with the new kernel, you can boot with
+   the old kernel by entering the label of the old image section at
+   the LILO prompt. (with the example lilo.conf file, the old label is
+   Linux.)
+
+   If that does not work (probably because of an error in lilo.conf),
+   boot the machine using your rescue disk, restore \l
+   file:/etc/lilo.conf from backup and re-run lilo.
+
+\i Testing: Here's a short program that opens the frame buffer and draws a
+   gradient-filled red square.
+
+\code
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <linux/fb.h>
+#include <sys/mman.h>
+
+int main()
+{
+    int fbfd = 0;
+    struct fb_var_screeninfo vinfo;
+    struct fb_fix_screeninfo finfo;
+    long int screensize = 0;
+    char *fbp = 0;
+    int x = 0, y = 0;
+    long int location = 0;
+
+    // Open the file for reading and writing
+    fbfd = open("/dev/fb0", O_RDWR);
+    if (!fbfd) {
+	printf("Error: cannot open framebuffer device.\n");
+	exit(1);
+    }
+    printf("The framebuffer device was opened successfully.\n");
+
+    // Get fixed screen information
+    if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
+	printf("Error reading fixed information.\n");
+	exit(2);
+    }
+
+    // Get variable screen information
+    if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {
+	printf("Error reading variable information.\n");
+	exit(3);
+    }
+
+    printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel );
+
+    // Figure out the size of the screen in bytes
+    screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
+
+    // Map the device to memory
+    fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,
+		       fbfd, 0);
+    if ((int)fbp == -1) {
+	printf("Error: failed to map framebuffer device to memory.\n");
+	exit(4);
+    }
+    printf("The framebuffer device was mapped to memory successfully.\n");
+
+    x = 100; y = 100;       // Where we are going to put the pixel
+
+    // Figure out where in memory to put the pixel
+    for ( y = 100; y < 300; y++ )
+	for ( x = 100; x < 300; x++ ) {
+
+	    location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +
+		       (y+vinfo.yoffset) * finfo.line_length;
+
+	    if ( vinfo.bits_per_pixel == 32 ) {
+		*(fbp + location) = 100;        // Some blue
+		*(fbp + location + 1) = 15+(x-100)/2;     // A little green
+		*(fbp + location + 2) = 200-(y-100)/5;    // A lot of red
+		*(fbp + location + 3) = 0;      // No transparency
+	    } else  { //assume 16bpp
+		int b = 10;
+		int g = (x-100)/6;     // A little green
+		int r = 31-(y-100)/16;    // A lot of red
+		unsigned short int t = r<<11 | g << 5 | b;
+		*((unsigned short int*)(fbp + location)) = t;
+	    }
+
+	}
+    munmap(fbp, screensize);
+    close(fbfd);
+    return 0;
+}
+\endcode
+\endlist
+
+*/