| wdenk | 5b1d713 | 2002-11-03 00:07:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2000 |
| 3 | * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it |
| 4 | * |
| Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 5 | * SPDX-License-Identifier: GPL-2.0+ |
| wdenk | 5b1d713 | 2002-11-03 00:07:02 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| Timur Tabi | 5576092 | 2011-03-21 16:38:49 -0500 | [diff] [blame] | 8 | "video-mode" environment variable |
| Hans de Goede | 7e68a1b | 2014-12-21 16:28:32 +0100 | [diff] [blame^] | 9 | ================================= |
| Timur Tabi | 5576092 | 2011-03-21 16:38:49 -0500 | [diff] [blame] | 10 | |
| 11 | The 'video-mode' environment variable can be used to enable and configure |
| 12 | some video drivers. The format matches the video= command-line option used |
| 13 | for Linux: |
| 14 | |
| 15 | video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string> |
| 16 | |
| 17 | <driver> The video driver name, ignored by U-Boot |
| 18 | <xres> The X resolution (in pixels) to use. |
| 19 | <yres> The Y resolution (in pixels) to use. |
| 20 | <depth> The color depth (in bits) to use. |
| 21 | <freq> The frequency (in Hz) to use. |
| 22 | <options> A comma-separated list of device-specific options |
| 23 | |
| Hans de Goede | 7e68a1b | 2014-12-21 16:28:32 +0100 | [diff] [blame^] | 24 | |
| 25 | U-Boot MPC8xx video controller driver |
| 26 | ===================================== |
| 27 | |
| 28 | The driver has been tested with the following configurations: |
| 29 | |
| 30 | - MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it |
| 31 | |
| Timur Tabi | 5576092 | 2011-03-21 16:38:49 -0500 | [diff] [blame] | 32 | Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi |
| Hans de Goede | 7e68a1b | 2014-12-21 16:28:32 +0100 | [diff] [blame^] | 33 | |
| 34 | |
| 35 | U-boot sunxi video controller driver |
| 36 | ==================================== |
| 37 | |
| 38 | U-boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output |
| 39 | requires the CONFIG_VIDEO_LCD_MODE Kconfig value to be set. |
| 40 | |
| 41 | The sunxi u-boot driver supports the following video-mode options: |
| 42 | |
| 43 | - monitor=[none|dvi|hdmi|lcd] - Select the video output to use |
| 44 | none: Disable video output. |
| 45 | dvi/hdmi: Selects output over the hdmi connector with dvi resp. hdmi output |
| 46 | format, if edid is used the format is automatically selected. |
| 47 | lcd: Selects video output to a LCD screen. |
| 48 | vga: Selects bideo output over the VGA connector. |
| 49 | Defaults to monitor=dvi. |
| 50 | |
| 51 | - hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature |
| 52 | 0: Disabled. Configure dvi/hdmi output even if no cable is detected |
| 53 | 1: Enabled. If a LCD has been configured fallback to the LCD when no cable is |
| 54 | detected, if no LCD is configured, disable video ouput. |
| 55 | Defaults to hpd=1. |
| 56 | |
| 57 | - edid=[0|1] - Enable use of DDC + EDID to get monitor info |
| 58 | 0: Disabled. |
| 59 | 1: Enabled. If valid EDID info was read from the monitor the EDID info will |
| 60 | overrides the xres, yres and refresh from the video-mode env. variable. |
| 61 | Defaults to edid=1. |
| 62 | |
| 63 | For example to always use the hdmi connector, even if no cable is inserted, |
| 64 | using edid info when available and otherwise initalizing it at 1024x768@60Hz, |
| 65 | use: video-mode=sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1 . |