clean up handling of the root filesystem mount - remove broadcom specific junk from the generic base-files part

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@3951 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 38 insertions, 0 deletions

diff --git a/package/base-files/brcm-2.4/sbin/mount_root b/package/base-files/brcm-2.4/sbin/mount_root
new file mode 100755
index 000000000..88a836c80
--- /dev/null
+++ b/package/base-files/brcm-2.4/sbin/mount_root
@@ -0,0 +1,38 @@
+#!/bin/sh
+is_dirty() {
+	grep Broadcom /proc/cpuinfo >&- || return 1
+	OFFSET="$(($(hexdump -v /dev/mtdblock/1 -s 20 -n 2 -e '"%d"')-1))"
+	return $(hexdump -v /dev/mtdblock/1 -s $OFFSET -n 1 -e '"%d"')
+}
+
+size=$(awk '/Mem:/ {l=5242880;print((s=$2/2)<l)?$2-l:s}' /proc/meminfo)
+mount none /tmp -t tmpfs -o size=$size
+
+if [ "$1" != "failsafe" ]; then 
+	mtd unlock linux
+	mount | grep jffs2 >&-
+	if [ $? = 0 ] ; then
+		if [ $(cat /proc/mtd | wc -l) = 6 ]; then
+			mtd erase OpenWrt
+			jffs2root --move
+		else
+			mount -o remount,rw /dev/root /
+		fi
+	else
+		. /bin/firstboot
+		is_dirty 
+		[ $? != 0 ] && {
+			echo "switching to jffs2"
+			mount /dev/mtdblock/4 /jffs -t jffs2
+			pivot /jffs /rom
+		} || {
+			echo "jffs2 unusable; using ramdisk"
+			ramoverlay
+		}
+	fi
+fi
+
+mount none /tmp -t tmpfs -o remount,nosuid,nodev,mode=1777
+mkdir -p /dev/pts
+mount none /dev/pts -t devpts
+mount -t sysfs none /sys 2>&-