# Set up the root filesystem on a USB stick
# Basic USB support (USB 1.1 and USB 2)
opkg update
opkg install kmod-usb-uhci kmod-usb-ohci kmod-usb2
insmod uhci
insmod usb-ohci
insmod usbcore
insmod ehci-hcd

# USB Storage (FAT requires additional modules
# that you can upgrade later, however)
opkg install kmod-usb-storage-mount block kmod-fs-ext4-core kmod-scsci

# Prepare USB stick (on the PC)
# -> Partition with three partitions (root, home, swap)
#    fdisk /dev/sdb etc.
# -> Format partitions with ext4 or swap
#    mkfs.ext4 /dev/sdb1
#    mkfs.ext4 /dev/sdb2
#    mkswap    /dev/sdb3

# Prepare root on USB (copies old root file system)
mkdir -p /mnt/usb
mount /dev/sda1 /mnt/usb
tar -cvf --C /overlay . | tar -xf --C /mnt/usb
umount /mnt/usb