Hdmi As Secondary Display; Hdmi As Mirror Of The Internal Display; Hdmi Xml Configuration - GARZ&FRICKE GUF-Yocto-34.0-r5756-0-VINCELL User Manual

GUF-Yocto-34.0-r5756-0
The resolution is configured automatically via EDID. The monitor is registered as framebuffer /dev/fb0. To over-
write the resolution from the EDID an xml file can be used
Note: The bootlogo will still come up in the resolution read from the EDID, but the X Server will use
the resolution configured via xml.

6.16.2 HDMI as secondary display

The HDMI output can also be used as secondary display. This mode is automatically selected when a xml display
configuration is configured in the system (this is the default for devices with internal display).
The HDMI device connected to VINCELL is configured automatically via EDID. The monitor is registered as a
separate framebuffer /dev/fb2. By default the HDMI display is blanked. It can be unblanked by
hdmiconfig unblank
To unblank the HDMI monitor during startup, an xml file needs to be imported. The xml file can also be used to
specify a custom resolution
Note: Currently there is a limitation in the X Server display driver, so the secondary display can't be
used from the X Server out of the box.

6.16.3 HDMI as mirror of the internal display

The HDMI mirror mode is available uppon request from Garz & Fricke.
6.16.4 HDMI XML configuration
Different settings of the HDMI output can be configured by an xml file. The format of this file can be seen in the
example below:
<?xml version="1.0" encoding="ASCII" standalone="yes" ?>
<configurationFile xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
<!--
Defines the settings for hdmi interface
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VINCELL User Manual
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I
[ 6.16.4 HDMI XML configuration].
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
Mandatory settings:
default="1"
!
to unblank the monitor during startup with the
default resolution.
,
or:
xres="800" yres="600" refresh="60"
to set a custom resolution.
!
Optional settings, everything supported by fbset in the
subnode <fbset>:
,
Display geometry:
Display timings:
I
[ 6.16.4 HDMI XML
!
vxres=<value> : virtual horizontal
resolution (in pixels)
,
!
vyres=<value> : virtual vertical
resolution (in pixels)
,
!
depth=<value> : display depth (in bits
per pixel)
,
!
nonstd=<value> : select nonstandard video
mode
,
!
pixclock=<value> : pixel clock (in
picoseconds)
,
left=<value> : left margin (in pixels)
right=<value> : right margin (in pixels)
!
upper=<value> : upper margin (in pixel
lines)
,
configuration].