add some doc and script to chroot into the ARM system. And prepare the script to update the image.

PrepareRaspbianImage.md

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+Prerequisites
+=============
+
+Get the latest image: http://www.raspberrypi.org/downloads (the recommended one)
+And write it on the SD Card:
+dd bs=4M if=~/2013-02-09-wheezy-raspbian.img of=/dev/mmcblk0
+
+Note: I had to unplug/replug the sd card in order to see the second partition.
+
+On a debian/ubuntu host:
+- http://burstcoding.blogspot.com/2012/12/qemu-user-mode-arm-for-raspbian-chroot.html (not tested)
+On a gentoo host:
+- app-emulation/qemu-user
+
+Choot
+=====
+
+chroot
+
+

prepare_rPI.sh

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+#!/bin/bash
+
+apt-get update
+apt-get dist-upgrade
+apt-get autoremove
+apt-get install libreoffice
+
+

proper_chroot.sh

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+#!/bin/bash
+
+set -e
+set -x
+
+PARTITION='/dev/mmcblk0p2'
+CHROOT_PATH='/mnt/arm_rPi'
+
+clean(){
+    mv ${CHROOT_PATH}/etc/ld.so.preload_bkp ${CHROOT_PATH}/etc/ld.so.preload
+    rm ${CHROOT_PATH}/etc/resolv.conf
+    rm ${CHROOT_PATH}/usr/bin/qemu-static-arm*
+
+    umount ${CHROOT_PATH}/dev/pts
+    umount ${CHROOT_PATH}/dev/shm
+    umount ${CHROOT_PATH}/dev
+    umount ${CHROOT_PATH}/proc
+    umount ${CHROOT_PATH}/sys
+    umount ${CHROOT_PATH}/tmp
+    umount ${CHROOT_PATH}
+
+    rm -rf ${CHROOT_PATH}
+}
+
+trap clean EXIT TERM INT
+
+mkdir -p ${CHROOT_PATH}
+mount ${PARTITION} ${CHROOT_PATH}
+
+cp /usr/bin/qemu-static-arm* ${CHROOT_PATH}/usr/bin/
+
+mount -o bind /dev ${CHROOT_PATH}/dev
+mount -o bind /dev/pts ${CHROOT_PATH}/dev/pts
+mount -o bind /dev/shm ${CHROOT_PATH}/dev/shm
+mount -o bind /proc ${CHROOT_PATH}/proc
+mount -o bind /sys ${CHROOT_PATH}/sys
+mount -o bind /tmp ${CHROOT_PATH}/tmp
+
+cp -pf /etc/resolv.conf ${CHROOT_PATH}/etc
+mv ${CHROOT_PATH}/etc/ld.so.preload ${CHROOT_PATH}/etc/ld.so.preload_bkp
+
+chroot ${CHROOT_PATH}