[PATCH] i810fb: Update i810fb documentation
Update i810fb documentation to describe new features and configuration changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>hifive-unleashed-5.1
Antonino A. Daplas
Linus Torvalds
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747a5054c0
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c93a777103
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@ -5,6 +5,7 @@ Intel 810/815 Framebuffer driver
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March 17, 2002
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First Released: July 2001
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Last Update: September 12, 2005
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================================================================
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A. Introduction
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@ -44,6 +45,8 @@ B. Features
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- Hardware Cursor Support
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- Supports EDID probing either by DDC/I2C or through the BIOS
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C. List of available options
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a. "video=i810fb"
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@ -52,14 +55,17 @@ C. List of available options
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Recommendation: required
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b. "xres:<value>"
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select horizontal resolution in pixels
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select horizontal resolution in pixels. (This parameter will be
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ignored if 'mode_option' is specified. See 'o' below).
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Recommendation: user preference
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(default = 640)
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c. "yres:<value>"
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select vertical resolution in scanlines. If Discrete Video Timings
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is enabled, this will be ignored and computed as 3*xres/4.
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is enabled, this will be ignored and computed as 3*xres/4. (This
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parameter will be ignored if 'mode_option' is specified. See 'o'
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below)
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Recommendation: user preference
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(default = 480)
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@ -86,7 +92,8 @@ C. List of available options
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g. "hsync1/hsync2:<value>"
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select the minimum and maximum Horizontal Sync Frequency of the
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monitor in KHz. If a using a fixed frequency monitor, hsync1 must
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be equal to hsync2.
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be equal to hsync2. If EDID probing is successful, these will be
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ignored and values will be taken from the EDID block.
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Recommendation: check monitor manual for correct values
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default (29/30)
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@ -94,7 +101,8 @@ C. List of available options
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h. "vsync1/vsync2:<value>"
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select the minimum and maximum Vertical Sync Frequency of the monitor
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in Hz. You can also use this option to lock your monitor's refresh
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rate.
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rate. If EDID probing is successful, these will be ignored and values
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will be taken from the EDID block.
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Recommendation: check monitor manual for correct values
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(default = 60/60)
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@ -154,7 +162,11 @@ C. List of available options
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Recommendation: do not set
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(default = not set)
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o. <xres>x<yres>[-<bpp>][@<refresh>]
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The driver will now accept specification of boot mode option. If this
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is specified, the options 'xres' and 'yres' will be ignored. See
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Documentation/fb/modedb.txt for usage.
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D. Kernel booting
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Separate each option/option-pair by commas (,) and the option from its value
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@ -176,7 +188,10 @@ will be computed based on the hsync1/hsync2 and vsync1/vsync2 values.
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IMPORTANT:
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You must include hsync1, hsync2, vsync1 and vsync2 to enable video modes
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better than 640x480 at 60Hz.
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better than 640x480 at 60Hz. HOWEVER, if your chipset/display combination
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supports I2C and has an EDID block, you can safely exclude hsync1, hsync2,
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vsync1 and vsync2 parameters. These parameters will be taken from the EDID
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block.
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E. Module options
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@ -217,32 +232,21 @@ F. Setup
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This is required. The option is under "Character Devices"
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d. Under "Graphics Support", select "Intel 810/815" either statically
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or as a module. Choose "use VESA GTF for video timings" if you
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need to maximize the capability of your display. To be on the
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or as a module. Choose "use VESA Generalized Timing Formula" if
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you need to maximize the capability of your display. To be on the
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safe side, you can leave this unselected.
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e. If you want a framebuffer console, enable it under "Console
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e. If you want support for DDC/I2C probing (Plug and Play Displays),
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set 'Enable DDC Support' to 'y'. To make this option appear, set
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'use VESA Generalized Timing Formula' to 'y'.
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f. If you want a framebuffer console, enable it under "Console
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Drivers"
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f. Compile your kernel.
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g. Compile your kernel.
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g. Load the driver as described in section D and E.
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h. Load the driver as described in section D and E.
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Optional:
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h. If you are going to run XFree86 with its native drivers, the
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standard XFree86 4.1.0 and 4.2.0 drivers should work as is.
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However, there's a bug in the XFree86 i810 drivers. It attempts
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to use XAA even when switched to the console. This will crash
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your server. I have a fix at this site:
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http://i810fb.sourceforge.net.
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You can either use the patch, or just replace
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/usr/X11R6/lib/modules/drivers/i810_drv.o
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with the one provided at the website.
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i. Try the DirectFB (http://www.directfb.org) + the i810 gfxdriver
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patch to see the chipset in action (or inaction :-).
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