Use squashfs and overlayfs with remote update function in mind

Author: OpenLarry

board/olimex/imx233_olinuxino_wordclock/device_table.txt

@@ -6,9 +6,11 @@
 # dynamic configurations (where devtmpfs, mdev or udev are used).
 #
 # <name>				<type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+/sbin/boot				f	755	0	0	-	-	-	-	-
 /usr/sbin/wpa_action				f	755	0	0	-	-	-	-	-
 /etc/autossh/id_rsa				f	600	0	0	-	-	-	-	-
 /etc/init.d/S60autossh				f	755	0	0	-	-	-	-	-
+/etc/init.d/S99firstboot				f	755	0	0	-	-	-	-	-
 /etc/network/if-pre-up.d/setmac				f	755	0	0	-	-	-	-	-
 /etc/wpa_supplicant/action_wpa.sh				f	755	0	0	-	-	-	-	-
 /etc/wpa_supplicant/functions.sh				f	755	0	0	-	-	-	-	-

board/olimex/imx233_olinuxino_wordclock/sd-card.img.gz

@@ -1,32 +1,11 @@
 #!/bin/sh
 set -e
 
-if [ -e $1/sd-card.img ]; then
-	rm $1/sd-card.img
-fi
-
-
-fssize=$(stat --printf="%s" $1/rootfs.ext2)
-imgsize=$(expr $fssize / 512 + 4096)
-
-dd if=/dev/zero of=$1/sd-card.img bs=512 count=$imgsize
-
-# echo "n
-# p
-# 1
-# 
-# +1M
-# t
-# 53
-# n
-# p
-# 2
-# 
-# 
-# w
-# " | fdisk -b 512 -H 62 -S 62 $1/sd-card.img
-
-dd if=board/olimex/imx233_olinuxino_wordclock/mbr.bin of=$1/sd-card.img bs=512
-dd if=$1/uboot-env.bin of=$1/sd-card.img bs=512 seek=512
-dd if=$1/u-boot.sd of=$1/sd-card.img bs=512 seek=2048
-dd if=$1/rootfs.ext2 of=$1/sd-card.img bs=512 seek=4096
+# copy partition table
+gzip -d -c board/olimex/imx233_olinuxino_wordclock/sd-card.img.gz > $1/sd-card.img
+
+# copy partitions
+dd if=$1/uboot-env.bin of=$1/sd-card.img bs=512 seek=512 conv=notrunc
+dd if=$1/u-boot.sd of=$1/sd-card.img bs=512 seek=2048 conv=notrunc
+dd if=$1/uImage of=$1/sd-card.img bs=512 seek=6144 conv=notrunc
+dd if=$1/rootfs.squashfs of=$1/sd-card.img bs=512 seek=26624 conv=notrunc

board/olimex/imx233_olinuxino_wordclock/sd-card.sh

@@ -0,0 +1,5 @@
+# Configuration file for fw_(printenv/setenv) utility.
+# Up to two entries are valid, in this case the redundant
+# environment sector is assumed present.
+# MTD device name       Device offset   Env. size       Flash sector size
+/dev/mmcblk0 0x40000 0x4000 0x4000

board/olimex/imx233_olinuxino_wordclock/skeleton/etc/fw_env.config

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# Set firstboot uboot environment variable
+#
+set -e
+
+case "$1" in
+  start)
+	if fw_printenv firstboot | grep -q 2; then
+		echo "First boot after system upgrade";
+		fw_setenv firstboot 0;
+	fi;
+	;;
+esac

board/olimex/imx233_olinuxino_wordclock/skeleton/etc/init.d/S99firstboot

@@ -0,0 +1,35 @@
+# /etc/inittab
+#
+# Copyright (C) 2001 Erik Andersen <[email protected]>
+#
+# Note: BusyBox init doesn't support runlevels.  The runlevels field is
+# completely ignored by BusyBox init. If you want runlevels, use
+# sysvinit.
+#
+# Format for each entry: <id>:<runlevels>:<action>:<process>
+#
+# id        == tty to run on, or empty for /dev/console
+# runlevels == ignored
+# action    == one of sysinit, respawn, askfirst, wait, and once
+# process   == program to run
+
+# Startup the system
+::sysinit:/sbin/boot
+
+::sysinit:/bin/mkdir -p /dev/pts
+::sysinit:/bin/mkdir -p /dev/shm
+::sysinit:/bin/mount -a
+::sysinit:/bin/hostname -F /etc/hostname
+# now run any rc scripts
+::sysinit:/etc/init.d/rcS
+
+# Put a getty on the serial port
+console::respawn:/sbin/getty -L  console 0 vt100 # GENERIC_SERIAL
+
+# Stuff to do for the 3-finger salute
+::ctrlaltdel:/sbin/reboot
+
+# Stuff to do before rebooting
+::shutdown:/etc/init.d/rcK
+::shutdown:/sbin/swapoff -a
+::shutdown:/bin/umount -a -r

board/olimex/imx233_olinuxino_wordclock/skeleton/etc/inittab

@@ -0,0 +1,17 @@
+#!/bin/sh
+set -e
+
+if mount -t ext4 -o noatime /dev/mmcblk0p4 /mnt/root-rw; then
+	echo "Mounted ext4 filesystem";
+else
+	echo "Creating ext4 filesystem";
+	mkfs.ext4 /dev/mmcblk0p4;
+	mount -t ext4 -o noatime /dev/mmcblk0p4 /mnt/root-rw;
+fi;
+
+mkdir -p /mnt/root-rw/upper
+mkdir -p /mnt/root-rw/work
+mount -t overlay overlay -olowerdir=/,upperdir=/mnt/root-rw/upper,workdir=/mnt/root-rw/work /mnt/root-ro
+pivot_root /mnt/root-ro /mnt/root-ro/mnt/root-ro
+mount -o move /mnt/root-ro/dev /dev
+mount -o move /mnt/root-ro/mnt/root-rw /mnt/root-rw

board/olimex/imx233_olinuxino_wordclock/skeleton/mnt/root-ro/.empty

@@ -1,24 +1,19 @@
 baudrate=115200
-boot_fdt=try
-bootcmd=mmc dev ${mmcdev}; if mmc rescan; then if gpio input 994; then echo Button not pressed; else echo Button pressed; run copypart; fi; if test ${firstboot} = 1; then run copypart; fi; if run loadbootscript; then run bootscript; else if run loaduimage; then run mmcboot; else echo uImage error; fi; fi; else echo mmc error; fi
+bootcmd=mmc dev ${mmcdev}; if mmc rescan; then if gpio input 986; then echo Button 2 not pressed; run checkfail; else echo Button 2 pressed; run switch_system; fi; if gpio input 994; then echo Button 1 not pressed; else echo Button 1 pressed; echo Erase ext4 partition; mw 0x41000000 0x00000000 0x800000; mmc write 0x41000000 0x26800 0x10000; fi; run set_system; if run loaduimage; then run mmcargs; bootm ${loadaddr}; else echo uImage error; fi; else echo mmc error; fi 
 bootdelay=1
-bootscript=echo Running bootscript from mmc ...; source
 console=ttyAMA0
-fdt_addr=0x41000000
-fdt_file=/boot/imx23-olinuxino.dtb
+kernelpart=0x1800
 loadaddr=0x42000000
-loadbootscript=ext2load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
-loadfdt=ext2load mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
-loaduimage=ext2load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${uimage}
+loaduimage=mmc read ${loadaddr} ${kernelpart} 0x2000
 mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot}
-mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootm ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootm; else echo WARN: Cannot load the DT; fi; fi; else bootm; fi;
 mmcdev=0
-mmcpart=3
-mmcroot=/dev/mmcblk0p3 rw rootwait
-script=boot.scr
+mmcroot=/dev/mmcblk0p7 ro rootwait
+script=/boot.scr
 stderr=serial
 stdin=serial
 stdout=serial
-uimage=/boot/uImage
-firstboot=1
-copypart=echo Copy system partition...; mmc read 0x41000000 0x1000 0xC800; mmc write 0x41000000 0x33000 0xC800; echo 25; mmc read 0x41000000 0xD800 0xC800; mmc write 0x41000000 0x3F800 0xC800; echo 50; mmc read 0x41000000 0x1A000 0xC800; mmc write 0x41000000 0x4C000 0xC800; echo 75; mmc read 0x41000000 0x26800 0xC800; mmc write 0x41000000 0x58800 0xC800; echo 100; setenv firstboot 0; saveenv;
+set_system=if test ${system} = 1; then echo Run system 2; setenv kernelpart 0x4000; setenv mmcroot /dev/mmcblk0p3 ro rootwait; else echo Run system 1; fi;
+switch_system=setenv firstboot 0; if test ${system} = 1; then setenv system 0; else setenv system 1; fi; saveenv;
+system=0
+firstboot=0
+checkfail=if test ${firstboot} = 2; then run switch_system; fi; if test ${firstboot} = 1; then setenv firstboot 2; saveenv; fi;