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authorHans de Goede <hdegoede@redhat.com>2015-08-05 00:06:47 +0200
committerHans de Goede <hdegoede@redhat.com>2015-08-14 08:37:36 +0200
commit58332f89b63de484024deae402feeafefc9a43e1 (patch)
treed9a8c8844341f46a08bde07bab2cff49740f7b07 /doc/README.video
parentc67a8767f57989704304d64d9e9006007e2ff083 (diff)
sunxi: display: Add overscan correction
Add support for making the visual area of the framebuffer smaller and drawing a black border around it. This is intended for use with overscanning monitors (esp. with composite video out), to avoid part of the picture being invisible. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk> Acked-by: Anatolij Gustschin <agust@denx.de>
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diff --git a/doc/README.video b/doc/README.video
index 4f7a4b5db54..62ac17b0490 100644
--- a/doc/README.video
+++ b/doc/README.video
@@ -68,6 +68,11 @@ The sunxi u-boot driver supports the following video-mode options:
overrides the xres, yres and refresh from the video-mode env. variable.
Defaults to edid=1.
+- overscan_x/overscan_y=<int> - Set x/y overscan value
+ This configures a black border on the left and right resp. top and bottom
+ to deal with overscanning displays. Defaults to overscan_x=32 and
+ overscan_y=20 for composite monitors, 0 for other monitors.
+
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: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".