#! /bin/bash
#
# Sheeva kernel install
# This README can be used to flash the new kernel
# Watch out for erase/flash errors
# If errors are encountered you should redo the flash
#
# This is a mainline Linux Kernel and you must set
# the mainlineLinux and arcNumber env variables in U-Boot
# and change the bootargs for a successful boot.
#
# setenv mainlineLinux yes
# setenv arcNumber 2097
####### change bootargs, replace nand_mtd with orion_nand and add rootfstype=jffs2
# setenv bootargs rootfstype=jffs2 console=ttyS0,115200 mtdparts=orion_nand:0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs) rw root=/dev/mtdblock1 rw ip=192.168.1.9:192.168.1.4:192.168.1.4:255.255.255.0:DB88FXX81:eth0:none
# saveenv

####### change vm security settings
# Due to changes in vm security a change must be made in /etc/sysctl.d/10-process-security.conf.
# vm.mmap_min_addr should be set to 32768 (This change is safe for any kernel version).
# If this is not done it is likely that you will not be able to login remotely.
# Although you should still be able to login as root on the main console.

set -e
set -u

KVer='2.6.30.6'

function Md5Compare ()
{
	if [[ $(cat $2 | cut -d' ' -f1) \
			!= $(md5sum $1 | cut -d' ' -f1) ]]; then
		echo "Bad md5 detected on $1"
		exit 1
	fi
}

function Download()
{
	echo "Downloading files"
	local f=''
	for f in Modules.tar.gz Modules.tar.gz.md5 uImage uImage.md5; do
		if [[ ! -f sheeva-$KVer-$f ]]; then
			if [[ -z "$(which wget)" ]]; then
				echo "Use apt-get to install wget, then rerun this script"
				exit 1
			fi
			wget -c http://sheeva6.with-linux.com/sheeva/$KVer/sheeva-$KVer-$f || \
			wget -c http://sheeva.with-linux.com/sheeva/$KVer/sheeva-$KVer-$f
			if [[ ! -f sheeva-$KVer-$f ]]; then
				echo "Unable to retrieve sheeva-$KVer-$f"
				exit 1
			fi
		fi
	done
	Md5Compare sheeva-$KVer-Modules.tar.gz sheeva-$KVer-Modules.tar.gz.md5
	Md5Compare sheeva-$KVer-uImage sheeva-$KVer-uImage.md5
}

function ExtractModules()
{
	echo "Extracting modules"
	tar x -C / --overwrite -zf sheeva-$KVer-Modules.tar.gz
}

function RootKernel()
{
	echo "Writing kernel to root"
	cp sheeva-$KVer-uImage /boot/
	echo "****************************************************************"
	echo " update your bootcmd to load sheeva-$KVer-uImage"
	echo " or use a symlink from /boot/sheeva-$KVer-uImage to /boot/uImage"
	echo "****************************************************************"
}

function FlashKernel()
{
	echo "Flashing kernel"
	# MTDDEVICE should be either /dev/mtd0 or /dev/mtd1
	# depending on which partition contains the kernel uImage

	local Mtd=$(grep uImage /proc/mtd | cut -d' ' -f1 | sed 's#:##')

	flash_eraseall -j /dev/$Mtd
	nandwrite -pm /dev/$Mtd sheeva-$KVer-uImage
}

Download
ExtractModules

if [[ $# > 0 ]] && [[ "$1" == "--rootkernel" ]]; then
	RootKernel
else
	FlashKernel
fi