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
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:
54 - hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature
55  0: Disabled. Configure dvi/hdmi output even if no cable is detected
57  Defaults to hpd=1.
59 - hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds
61  time for the monitor to assert the HPD signal. This configures how long to
62  wait for the HPD signal before assuming no cable is connected.
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
76 For example to always use the hdmi connector, even if no cable is inserted,
78 use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".