1 ================================ 2 Intel 810/815 Framebuffer driver 3 ================================ 4 5 Tony Daplas <adaplas@pol.net> 6 7 http://i810fb.sourceforge.net 8 9 March 17, 2002 10 11 First Released: July 2001 12 Last Update: September 12, 2005 13 14 A. Introduction 15 =============== 16 17 This is a framebuffer driver for various Intel 810/815 compatible 18 graphics devices. These include: 19 20 - Intel 810 21 - Intel 810E 22 - Intel 810-DC100 23 - Intel 815 Internal graphics only, 100Mhz FSB 24 - Intel 815 Internal graphics only 25 - Intel 815 Internal graphics and AGP 26 27 B. Features 28 ============ 29 30 - Choice of using Discrete Video Timings, VESA Generalized Timing 31 Formula, or a framebuffer specific database to set the video mode 32 33 - Supports a variable range of horizontal and vertical resolution and 34 vertical refresh rates if the VESA Generalized Timing Formula is 35 enabled. 36 37 - Supports color depths of 8, 16, 24 and 32 bits per pixel 38 39 - Supports pseudocolor, directcolor, or truecolor visuals 40 41 - Full and optimized hardware acceleration at 8, 16 and 24 bpp 42 43 - Robust video state save and restore 44 45 - MTRR support 46 47 - Utilizes user-entered monitor specifications to automatically 48 calculate required video mode parameters. 49 50 - Can concurrently run with xfree86 running with native i810 drivers 51 52 - Hardware Cursor Support 53 54 - Supports EDID probing either by DDC/I2C or through the BIOS 55 56 C. List of available options 57 ============================= 58 59 a. "video=i810fb" 60 enables the i810 driver 61 62 Recommendation: required 63 64 b. "xres:<value>" 65 select horizontal resolution in pixels. (This parameter will be 66 ignored if 'mode_option' is specified. See 'o' below). 67 68 Recommendation: user preference 69 (default = 640) 70 71 c. "yres:<value>" 72 select vertical resolution in scanlines. If Discrete Video Timings 73 is enabled, this will be ignored and computed as 3*xres/4. (This 74 parameter will be ignored if 'mode_option' is specified. See 'o' 75 below) 76 77 Recommendation: user preference 78 (default = 480) 79 80 d. "vyres:<value>" 81 select virtual vertical resolution in scanlines. If (0) or none 82 is specified, this will be computed against maximum available memory. 83 84 Recommendation: do not set 85 (default = 480) 86 87 e. "vram:<value>" 88 select amount of system RAM in MB to allocate for the video memory 89 90 Recommendation: 1 - 4 MB. 91 (default = 4) 92 93 f. "bpp:<value>" 94 select desired pixel depth 95 96 Recommendation: 8 97 (default = 8) 98 99 g. "hsync1/hsync2:<value>" 100 select the minimum and maximum Horizontal Sync Frequency of the 101 monitor in kHz. If using a fixed frequency monitor, hsync1 must 102 be equal to hsync2. If EDID probing is successful, these will be 103 ignored and values will be taken from the EDID block. 104 105 Recommendation: check monitor manual for correct values 106 (default = 29/30) 107 108 h. "vsync1/vsync2:<value>" 109 select the minimum and maximum Vertical Sync Frequency of the monitor 110 in Hz. You can also use this option to lock your monitor's refresh 111 rate. If EDID probing is successful, these will be ignored and values 112 will be taken from the EDID block. 113 114 Recommendation: check monitor manual for correct values 115 (default = 60/60) 116 117 IMPORTANT: If you need to clamp your timings, try to give some 118 leeway for computational errors (over/underflows). Example: if 119 using vsync1/vsync2 = 60/60, make sure hsync1/hsync2 has at least 120 a 1 unit difference, and vice versa. 121 122 i. "voffset:<value>" 123 select at what offset in MB of the logical memory to allocate the 124 framebuffer memory. The intent is to avoid the memory blocks 125 used by standard graphics applications (XFree86). The default 126 offset (16 MB for a 64 MB aperture, 8 MB for a 32 MB aperture) will 127 avoid XFree86's usage and allows up to 7 MB/15 MB of framebuffer 128 memory. Depending on your usage, adjust the value up or down 129 (0 for maximum usage, 31/63 MB for the least amount). Note, an 130 arbitrary setting may conflict with XFree86. 131 132 Recommendation: do not set 133 (default = 8 or 16 MB) 134 135 j. "accel" 136 enable text acceleration. This can be enabled/reenabled anytime 137 by using 'fbset -accel true/false'. 138 139 Recommendation: enable 140 (default = not set) 141 142 k. "mtrr" 143 enable MTRR. This allows data transfers to the framebuffer memory 144 to occur in bursts which can significantly increase performance. 145 Not very helpful with the i810/i815 because of 'shared memory'. 146 147 Recommendation: do not set 148 (default = not set) 149 150 l. "extvga" 151 if specified, secondary/external VGA output will always be enabled. 152 Useful if the BIOS turns off the VGA port when no monitor is attached. 153 The external VGA monitor can then be attached without rebooting. 154 155 Recommendation: do not set 156 (default = not set) 157 158 m. "sync" 159 Forces the hardware engine to do a "sync" or wait for the hardware 160 to finish before starting another instruction. This will produce a 161 more stable setup, but will be slower. 162 163 Recommendation: do not set 164 (default = not set) 165 166 n. "dcolor" 167 Use directcolor visual instead of truecolor for pixel depths greater 168 than 8 bpp. Useful for color tuning, such as gamma control. 169 170 Recommendation: do not set 171 (default = not set) 172 173 o. <xres>x<yres>[-<bpp>][@<refresh>] 174 The driver will now accept specification of boot mode option. If this 175 is specified, the options 'xres' and 'yres' will be ignored. See 176 Documentation/fb/modedb.rst for usage. 177 178 D. Kernel booting 179 ================= 180 181 Separate each option/option-pair by commas (,) and the option from its value 182 with a colon (:) as in the following:: 183 184 video=i810fb:option1,option2:value2 185 186 Sample Usage 187 ------------ 188 189 In /etc/lilo.conf, add the line:: 190 191 append="video=i810fb:vram:2,xres:1024,yres:768,bpp:8,hsync1:30,hsync2:55, \ 192 vsync1:50,vsync2:85,accel,mtrr" 193 194 This will initialize the framebuffer to 1024x768 at 8bpp. The framebuffer 195 will use 2 MB of System RAM. MTRR support will be enabled. The refresh rate 196 will be computed based on the hsync1/hsync2 and vsync1/vsync2 values. 197 198 IMPORTANT: 199 You must include hsync1, hsync2, vsync1 and vsync2 to enable video modes 200 better than 640x480 at 60Hz. HOWEVER, if your chipset/display combination 201 supports I2C and has an EDID block, you can safely exclude hsync1, hsync2, 202 vsync1 and vsync2 parameters. These parameters will be taken from the EDID 203 block. 204 205 E. Module options 206 ================== 207 208 The module parameters are essentially similar to the kernel 209 parameters. The main difference is that you need to include a Boolean value 210 (1 for TRUE, and 0 for FALSE) for those options which don't need a value. 211 212 Example, to enable MTRR, include "mtrr=1". 213 214 Sample Usage 215 ------------ 216 217 Using the same setup as described above, load the module like this:: 218 219 modprobe i810fb vram=2 xres=1024 bpp=8 hsync1=30 hsync2=55 vsync1=50 \ 220 vsync2=85 accel=1 mtrr=1 221 222 Or just add the following to a configuration file in /etc/modprobe.d/:: 223 224 options i810fb vram=2 xres=1024 bpp=16 hsync1=30 hsync2=55 vsync1=50 \ 225 vsync2=85 accel=1 mtrr=1 226 227 and just do a:: 228 229 modprobe i810fb 230 231 232 F. Setup 233 ========= 234 235 a. Do your usual method of configuring the kernel 236 237 make menuconfig/xconfig/config 238 239 b. Under "Code maturity level options" enable "Prompt for development 240 and/or incomplete code/drivers". 241 242 c. Enable agpgart support for the Intel 810/815 on-board graphics. 243 This is required. The option is under "Character Devices". 244 245 d. Under "Graphics Support", select "Intel 810/815" either statically 246 or as a module. Choose "use VESA Generalized Timing Formula" if 247 you need to maximize the capability of your display. To be on the 248 safe side, you can leave this unselected. 249 250 e. If you want support for DDC/I2C probing (Plug and Play Displays), 251 set 'Enable DDC Support' to 'y'. To make this option appear, set 252 'use VESA Generalized Timing Formula' to 'y'. 253 254 f. If you want a framebuffer console, enable it under "Console 255 Drivers". 256 257 g. Compile your kernel. 258 259 h. Load the driver as described in sections D and E. 260 261 i. Try the DirectFB (http://www.directfb.org) + the i810 gfxdriver 262 patch to see the chipset in action (or inaction :-). 263 264 G. Acknowledgment: 265 =================== 266 267 1. Geert Uytterhoeven - his excellent howto and the virtual 268 framebuffer driver code made this possible. 269 270 2. Jeff Hartmann for his agpgart code. 271 272 3. The X developers. Insights were provided just by reading the 273 XFree86 source code. 274 275 4. Intel(c). For this value-oriented chipset driver and for 276 providing documentation. 277 278 5. Matt Sottek. His inputs and ideas helped in making some 279 optimizations possible. 280 281 H. Home Page: 282 ============== 283 284 A more complete, and probably updated information is provided at 285 http://i810fb.sourceforge.net. 286 287 Tony
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