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#!/bin/sh
#
# Script to detect AGL Reference Hardware and switch gpdf configuration
# as needed.
#
# NOTE:
# For the most part errors are ignored and the script returns
# 0/success so gpsd still be started if the script is somehow
# run on a board without the expected hardware.
COMPAT=/sys/firmware/devicetree/base/compatible
GPSTTY=/dev/ttySC3
if [ ! \( -f "$COMPAT" -a -c "$GPSTTY" -a -f /etc/default/gpsd.refhw \) ]; then
exit 0
fi
found=false
for c in `cat $COMPAT | tr '\0' ' '`; do
echo "c = $c"
if echo $c | grep -q '^agl,refhw-h3$'; then
found=true
break
fi
done
if $found; then
update-alternatives --install /etc/default/gpsd gpsd-defaults /etc/default/gpsd.refhw 20
else
update-alternatives --remove gpsd-defaults /etc/default/gpsd.refhw
fi
exit 0
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