Spectris Arcom VIPER Quick Start Manual page 28

VIPER RedBoot and AEL Quickstart
Software configuration
The CYCLOPS and VIPER-LITE systems require some additional configuration. For
example you must specify flat panel driver parameters to support the panel supplied
with the CYCLOPS. If using the VIPER-LITE, you must inform the Linux kernel of the
reduced CPU speed.
The configuration required for each of these systems is described in the following
sections.
CYCLOPS software configuration
The CYCLOPS system is shipped with an AEL image that has been configured for the
CYCLOPS hardware. The image is available in the /images/ folder on the Development
Kit CD.
If you reinstall this image, you will need to recalibrate the touchscreen using the
following command:
# killall tsc1d
# tsc1cal --device /dev/ttyS4 --generate /etc/tsc1d.conf --ten-bit
The touchscreen controller software is described more fully in the AEL technical
manual.
The CYCLOPS image also contains a configuration file /etc/modprobe.d/cyclops, which
sets up the correct parameters for the flat panel driver and a script /etc/init.d/cyclops
which configures COM5 correctly for use with the touchscreen controller. These files
are provided by the package variant-cyclops.
VIPER-LITE software configuration
The VIPER-LITE is a reduced power VIPER derivative based around the 200MHz
PXA255 processor.
As it is based on the 200MHz part, it is necessary to inform the Linux kernel of the
reduced maximum CPU speed. This can be done by adding the following to the default
kernel command line:
"cpu_pxa.max_frequency=199065"
For more information, see
This will limit the available CPU frequencies to 200MHz. For a discussion of CPU clock
frequency scaling, see page 22.
The VIPER-LITE Flash image available in the /images/ folder on the
Development Kit CD already contains the modified kernel command line.
© 2005 Arcom Issue D
Default command line on page 20.
Software configuration
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