83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
78 lines
3.0 KiB
Plaintext
78 lines
3.0 KiB
Plaintext
SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000
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* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
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*/
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"video-mode" environment variable
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=================================
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The 'video-mode' environment variable can be used to enable and configure
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some video drivers. The format matches the video= command-line option used
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for Linux:
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video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string>
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<driver> The video driver name, ignored by U-Boot
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<xres> The X resolution (in pixels) to use.
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<yres> The Y resolution (in pixels) to use.
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<depth> The color depth (in bits) to use.
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<freq> The frequency (in Hz) to use.
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<options> A comma-separated list of device-specific options
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U-Boot MPC8xx video controller driver
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=====================================
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The driver has been tested with the following configurations:
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- MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it
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Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi
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U-Boot sunxi video controller driver
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====================================
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U-Boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output
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requires the CONFIG_VIDEO_LCD_MODE Kconfig value to be set.
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The sunxi U-Boot driver supports the following video-mode options:
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- monitor=[none|dvi|hdmi|lcd|vga|composite-*] - Select the video output to use
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none: Disable video output.
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dvi/hdmi: Selects output over the hdmi connector with dvi resp. hdmi output
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format, if edid is used the format is automatically selected.
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lcd: Selects video output to a LCD screen.
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vga: Selects video output over the VGA connector.
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composite-pal/composite-ntsc/composite-pal-m/composite-pal-nc:
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Selects composite video output, note the specified resolution is
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ignored with composite video output.
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Defaults to monitor=dvi.
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- hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature
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0: Disabled. Configure dvi/hdmi output even if no cable is detected
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1: Enabled. Fallback to the lcd / vga / none in that order (if available)
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Defaults to hpd=1.
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- hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds
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When the monitor and the board power up at the same time, it may take some
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time for the monitor to assert the HPD signal. This configures how long to
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wait for the HPD signal before assuming no cable is connected.
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Defaults to hpd_delay=500.
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- edid=[0|1] - Enable use of DDC + EDID to get monitor info
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0: Disabled.
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1: Enabled. If valid EDID info was read from the monitor the EDID info will
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overrides the xres, yres and refresh from the video-mode env. variable.
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Defaults to edid=1.
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- overscan_x/overscan_y=<int> - Set x/y overscan value
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This configures a black border on the left and right resp. top and bottom
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to deal with overscanning displays. Defaults to overscan_x=32 and
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overscan_y=20 for composite monitors, 0 for other monitors.
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For example to always use the hdmi connector, even if no cable is inserted,
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using edid info when available and otherwise initalizing it at 1024x768@60Hz,
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use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".
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