u-boot/doc/README.video

1 SPDX-License-Identifier: GPL-2.0+
4  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
7 "video-mode" environment variable
10 The 'video-mode' environment variable can be used to enable and configure
11 some video drivers.  The format matches the video= command-line option used
14 	video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string>
16 	<driver>	The video driver name, ignored by U-Boot
21 	<options>	A comma-separated list of device-specific options
24 U-Boot MPC8xx video controller driver
29 - MPC823FADS with AD7176 on a PAL TV (YCbYCr)	- arsenio@tin.it
31 Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi
34 U-Boot sunxi video controller driver
37 U-Boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output
40 The sunxi U-Boot driver supports the following video-mode options:
42 - monitor=[none|dvi|hdmi|lcd|vga|composite-*] - Select the video output to use
43  none:     Disable video output.
46  lcd:      Selects video output to a LCD screen.
47  vga:      Selects video output over the VGA connector.
48  composite-pal/composite-ntsc/composite-pal-m/composite-pal-nc:
49            Selects composite video output, note the specified resolution is
50            ignored with composite video output.
53 - hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature
58 - hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds
64 - edid=[0|1] - Enable use of DDC + EDID to get monitor info
67     overrides the xres, yres and refresh from the video-mode env. variable.
70 - overscan_x/overscan_y=<int> - Set x/y overscan value
77 use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".
81 --------------
83 U-Boot supports the use of antialiased TrueType fonts on some platforms. This
92 increases U-Boot's size by about 70KB at present.
95 normally given in the name of your toolchain, e.g. arm-linux-gnueabihf (hf
96 means hardware floating point). You can also run gcc with -v to see if it has