Device is an Itus Shield (mips64), and not official. Using uboot.
I build from master branch. I'd like to be able to use the sysupgrade tarball, but the device doesn't "flash" firmware, it pivots from the ELF binary to an external root that it sets up during the initial boot. Below is my init that is used
You can see how if my keystone file (/.norwits) on the extroot isn't there, it preps the partition by removing everything and then copying ELF-bin contents to the extroot before pivoting.
So.. Where is the kernel (vmlinux?) kept? I can't find it at all.. Is the kernel kept in the ELF-bin, run from there, and just using the extroot?
#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t tmpfs dev /dev
mkdir -p /dev/pts
mount -t devpts devpts /dev/pts
# Figure out what mode the Shield is in
# We need to determine what Mode the Shield is in - Time to query the GPIOs
GPIO=99
GPIO16=99
GPIO17=99
GPIO=16
echo ${GPIO} > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio$GPIO/direction
GPIO16=$(cat /sys/class/gpio/gpio${GPIO}/value)
echo $GPIO > /sys/class/gpio/unexport
GPIO=17
echo $GPIO > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio$GPIO/direction
GPIO17=$(cat /sys/class/gpio/gpio${GPIO}/value)
echo $GPIO > /sys/class/gpio/unexport
if [ $GPIO16 -eq 0 ]; then
# Gateway Mode
export SHIELD_MODE="Gateway"
sys_ext=/sys/block/mmcblk1/mmcblk1p3
dev_ext=/dev/mmcblk1p3
dev_ext_major=179
dev_ext_minor=3
else
if [ $GPIO17 -eq 0 ]; then
# Bridge Mode
export SHIELD_MODE="Bridge"
sys_ext=/sys/block/mmcblk1/mmcblk1p4
dev_ext=/dev/mmcblk1p4
dev_ext_major=179
dev_ext_minor=4
else
# Router Mode
export SHIELD_MODE="Router"
sys_ext=/sys/block/mmcblk1/mmcblk1p2
dev_ext=/dev/mmcblk1p2
dev_ext_major=179
dev_ext_minor=2
fi
fi
extroot_dir=/extroot
count=0
while true
do
if [[ ${count} -eq 25 ]]
then
echo "Timed out."; break
fi
if [ -d ${sys_ext} ]
then
echo "Found ${sys_ext} : ${count}"; break
fi
i=0
marks='/ - \ |'
if [ $# -lt 4 ]; then
set -- "$@" $marks
fi
shift $(( (i+1) % $# ))
printf 'Waiting for external root to mount: %s\r' "$1"
sleep 1
count=$((count+1))
done
if [ ! -b ${dev_ext} ]
then
echo "Creating ${dev_ext}"; mknod ${dev_ext} b ${dev_ext_major} ${dev_ext_minor}
fi
mkdir ${extroot_dir}
mount ${dev_ext} ${extroot_dir} -o noatime
umount /sys
umount /proc
umount /dev/pts
umount /dev
firstboot=0
export FIRSTBOOT=${firstboot}
count=0
while true
do
if [ -e ${extroot_dir}/init ]
then
# Found an init, but is it ours?
if [ -e ${extroot_dir}/.norwits ]
then
echo "Found ${extroot_dir}/init"
echo "Firstboot flag: ${firstboot}"
export FIRSTBOOT=${firstboot}
echo ${SHIELD_MODE} > ${extroot_dir}/.mode
exec switch_root ${extroot_dir} /sbin/init
else
# Not our external rootfs! Time to go bubye.
# Remove everything, then wait for the next loop to populate with our stuff.
rm -rf ${extroot_dir}/*
fi
else
# No init found - Setting up the extroot block
echo "${extroot_dir}/init not found! Setting up block device for initial boot."
#Set up the call for firstboot.
firstboot=1
cp -a -f bin dev etc init lib lib64 mnt overlay proc rom root sbin sys tmp usr var www ${extroot_dir}
sleep 5
echo "# Empty File to validate correct block setup - DO NOT REMOVE" > ${extroot_dir}/.norwits
# Setting up first-boot configs
export FIRSTBOOT=${firstboot}
fi
i=0
marks='/ - \ |'
if [ $# -lt 4 ]; then
set -- "$@" $marks
fi
shift $(( (i+1) % $# ))
printf 'Waiting for external root to mount: %s\r' "$1"
sleep 1
count=$((count+1))
if [[ ${count} -eq 5 ]]
then
echo "Timed out."; break
fi
done
export INITRAMFS=1
exec /sbin/init
I just need help finding the direction I need to go in. Since I can't find the kernel on the device, I have to assume it stays in the ELF-bin. Which means I need to completely rethink the upgrade paths for the images.