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Diffstat (limited to 'doc/README.video')
| -rw-r--r-- | doc/README.video | 50 |
1 files changed, 42 insertions, 8 deletions
diff --git a/doc/README.video b/doc/README.video index dadbfcd..cfe6318 100644 --- a/doc/README.video +++ b/doc/README.video @@ -5,15 +5,8 @@ * SPDX-License-Identifier: GPL-2.0+ */ -U-Boot MPC8xx video controller driver -====================================== - -The driver has been tested with the following configurations: - -- MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it - "video-mode" environment variable -=============================== +================================= The 'video-mode' environment variable can be used to enable and configure some video drivers. The format matches the video= command-line option used @@ -28,4 +21,45 @@ for Linux: <freq> The frequency (in Hz) to use. <options> A comma-separated list of device-specific options + +U-Boot MPC8xx video controller driver +===================================== + +The driver has been tested with the following configurations: + +- MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it + Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi + + +U-boot sunxi video controller driver +==================================== + +U-boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output +requires the CONFIG_VIDEO_LCD_MODE Kconfig value to be set. + +The sunxi u-boot driver supports the following video-mode options: + +- monitor=[none|dvi|hdmi|lcd] - Select the video output to use + none: Disable video output. + dvi/hdmi: Selects output over the hdmi connector with dvi resp. hdmi output + format, if edid is used the format is automatically selected. + lcd: Selects video output to a LCD screen. + vga: Selects bideo output over the VGA connector. + Defaults to monitor=dvi. + +- hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature + 0: Disabled. Configure dvi/hdmi output even if no cable is detected + 1: Enabled. If a LCD has been configured fallback to the LCD when no cable is + detected, if no LCD is configured, disable video ouput. + Defaults to hpd=1. + +- edid=[0|1] - Enable use of DDC + EDID to get monitor info + 0: Disabled. + 1: Enabled. If valid EDID info was read from the monitor the EDID info will + overrides the xres, yres and refresh from the video-mode env. variable. + Defaults to edid=1. + +For example to always use the hdmi connector, even if no cable is inserted, +using edid info when available and otherwise initalizing it at 1024x768@60Hz, +use: video-mode=sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1 . |