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-rw-r--r--doc/README.video50
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 .