This guide covers fast (12mbit/s) usb and ext2 filesystem only

make shure you install package kmod-usb2 and load module ehci-hcd or your disk will be (very, hdparm -t < 12,5mbit/s) slow.

fdisk /dev/sda <- change this to your device

ln -s /tmp/resolv.conf.auto /etc/resolv.conf

Partition your disk. I have a 1GB Verbatim StoreNGo and used 700 MB for ext2 and 300 MB for swap

[@

@]

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@]

insmod ext2
insmod jbd
insmod ext3

echo "#!/bin/sh" >> /etc/init.d/swapspace

ipkg install kmod-usb-core kmod-usb-uhci kmod-scsi-core kmod-usb-storage kmod-fs-ext2 kmod-fs-ext3

insmod ext2 && insmod jbd && insmod ext3

ipkg install e2fsprogs fdisk

which will give you something like this:

First of all make sure you have all the modules required:

Log in with ssh

To make sure it works type 'df -h'

Which will give you something like this

If you are unsure what kernel you have use: uname -a

which will give you something like this:

First of all make sure you have all the modules required:

probably work for other devices too running OpenWRT? kamikaze on a 2.6 kernel

This tutorial is for OpenWRT? (kamikaze 7.09) with 2.6 kernel, but it will work on other devices too running OpenWRT? on 2.6

BootFromUsbDevice

This tutorial is for OpenWRT? (kamikaze 7.09) with 2.6 kernel, but it will

work on other devices too running OpenWRT? on 2.6

If you are unsure what kernel you have use: uname -a

which will give you something like this:

root@OpenWrt:/etc/init.d# uname -a Linux OpenWrt 2.6.21.6 #1 Fri Dec 28 11:04:49 UTC 2007 armv5teb unknown

First of all make sure you have all the modules required:

ipkg update ipkg install kmod-usb-core ipkg install kmod-usb-uhci ipkg install kmod-scsi-core ipkg install kmod-usb-storage ipkg install kmod-fs-ext2 ipkg install kmod-fs-ext3

Then load these modules:

insmod ext2 insmod jbd insmod ext3

Install e2fsprogs and fdisk

ipkg install e2fsprogs ipkg install fdisk

Partition your disk. I have a 1GB Verbatim StoreNGo? and used 700 MB for ext2 and 300 MB for swap

fdisk /dev/sda1 <- change this to your device

Then format your partition:

mke2fs /dev/sda1

Mount it and copy the filesystem to your USB-device

mount -t ext2 /dev/sda1 /mnt
mkdir /tmp/root
mount -o bind /rom /tmp/root
cp /tmp/root/* /mnt -a
umount /tmp/root
umount /mnt

vi /etc/init.d/pivotroot

copy and paste this into /etc/init.d/pivotroot

#!/bin/sh
# change this to your boot device
boot_dev="/dev/sda1"
/sbin/hotplug2 --override --persistent --max-children 1 --no-coldplug &
for module in usbcore uhci scsi_mod sd_mod usb-storage jbd ext2 ext3 ; do {
        insmod $module
        }; done

        # this may need to be higher if your disk is slow to initialize
        sleep 30s
        # mount the usb stick
        mount "$boot_dev" /mnt
        # if everything looks ok, do the pivot root
killall hotplug2
        [ -x /mnt/sbin/init ] && {
                mount -o move /proc /mnt/proc && \
                pivot_root /mnt /mnt/mnt && {
                mount -o move /mnt/dev /dev
                mount -o move /mnt/tmp /tmp
                mount -o move /mnt/jffs2 /jffs2 2>&-
                mount -o move /mnt/sys /sys 2>&-
          }
}

Then make it executable

chmod a+x /etc/init.d/pivotroot

Now, make the symlink so it will start at boot time

ln -s /etc/init.d/pivotroot /etc/rc.d/S10pivotroot

replace everything in /etc/init.d/rcS with this

vi /etc/init.d/rcS

#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
if test $2 == "boot" ; then
/etc/init.d/pivotroot
fi
{
 for i in /etc/rc.d/$1*; do
 $i $2 2>&1
 done
} | logger -s -p 6 -t '' &

Now reboot and telnet to your slug

Use 'passwd' to set your new root password

exit

and log in with ssh

To make sure it works issue df -h

Which will look something like this

root@OpenWrt:/# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/sda1                 1.0M      1.0M         0 100% /mnt/rom
/dev/mtdblock5            5.4M    752.0k      4.6M  14% /mnt/jffs
mini_fo:/jffs             1.0M      1.0M         0 100% /mnt
/dev/sda1               656.1M     19.0M    603.7M   3% /

Fixup resolv.conf symlink

rm /etc/resolv.conf
ln -s /mnt/tmp/resolv.conf.auto /etc/resolv.conf

If you created a swap partition you may want to use it

ipkg update
ipkg install swap-utils
mkswap /dev/sda2
swapon /dev/sda2

Make it start at boot time

echo "swapon /dev/sda2" >> /etc/init.d/swapspace
chmod a+x /etc/init.d/swapspace
ln -s /etc/init.d/swapspace /etc/rc.d/S99swapspace

Use free to see if it worked

root@OpenWrt:/etc# free
              total         used         free       shared      buffers
  Mem:        30472        11628        18844            0          960
 Swap:       297192            0       297192
Total:       327664        11628       316036