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