u-boot/doc/README.video

3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
5  * SPDX-License-Identifier:	GPL-2.0+
8 "video-mode" environment variable
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
15 	video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string>
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
25 U-Boot MPC8xx video controller driver
30 - MPC823FADS with AD7176 on a PAL TV (YCbYCr)	- arsenio@tin.it
32 Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi
35 U-Boot sunxi video controller driver
38 U-Boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output
41 The sunxi U-Boot driver supports the following video-mode options:
43 - monitor=[none|dvi|hdmi|lcd|vga|composite-*] - Select the video output to use
49  composite-pal/composite-ntsc/composite-pal-m/composite-pal-nc:
50            Selects composite video output, note the specified resolution is
51            ignored with composite video output.
54 - hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature
56  1: Enabled.  Fallback to the lcd / vga / none in that order (if available)
59 - hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds
65 - edid=[0|1] - Enable use of DDC + EDID to get monitor info
68     overrides the xres, yres and refresh from the video-mode env. variable.
71 - overscan_x/overscan_y=<int> - Set x/y overscan value
74  overscan_y=20 for composite monitors, 0 for other monitors.
78 use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".