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#!/bin/sh
set -e
if ! [ -x /usr/bin/memdiskfind ]; then
exit 0
fi
if ! dd if=/dev/mem of=/dev/null bs=1 count=1 > /dev/null 2>&1; then
# Skip memdiskfind under Secure Boot and other conditions
# where /dev/mem is unreadable.
# Avoids ugly error message from memdiskfind.
printf "access to /dev/mem is restricted, skipping memdisk setup"
exit 0
fi
if ! MEMDISK=$(/usr/bin/memdiskfind); then
exit 0
fi
# We found a memdisk, set up phram
# Sometimes "modprobe phram" can not successfully create /dev/mtd0.
# Have to try several times.
max_try=20
while [ ! -c /dev/mtd0 ] && [ "$max_try" -gt 0 ]; do
modprobe phram "phram=memdisk,${MEMDISK}"
sleep 0.2
if [ -c /dev/mtd0 ]; then
break
else
rmmod phram
fi
max_try=$((max_try - 1))
done
# Load mtdblock, the memdisk will be /dev/mtdblock0
modprobe mtdblock
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