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README.md +8 0

             # rpi2-gen-image
             ## Introduction
             `rpi2-gen-image.sh` is an advanced Debian Linux bootstrapping shell script for generating Debian OS images for the Raspberry 2 (RPi2) computer. The script at this time only supports the bootstrapping of the current stable Debian 8 "jessie" release.
             ## Build dependencies
             The following list of Debian packages must be installed on the build system because they are essentially required for the bootstrapping process. The script will check if all required packages are installed and missing packages will be installed automatically if confirmed by the user.
               ```debootstrap debian-archive-keyring qemu-user-static dosfstools rsync bmap-tools whois git-core```
             ## Command-line parameters
             The script accepts certain command-line parameters to enable or disable specific OS features, services and configuration settings. These parameters are passed to the `rpi2-gen-image.sh` script via (simple) shell-variables. Unlike environment shell-variables (simple) shell-variables are defined at the beginning of the command-line call of the `rpi2-gen-image.sh` script.
             #####Command-line examples:
             ```shell
             ENABLE_UBOOT=true ./rpi2-gen-image.sh
             ENABLE_CONSOLE=false ENABLE_IPV6=false ./rpi2-gen-image.sh
             ENABLE_WM=xfce4 ENABLE_FBTURBO=true ENABLE_MINBASE=true ./rpi2-gen-image.sh
             ENABLE_HARDNET=true ENABLE_IPTABLES=true /rpi2-gen-image.sh
             APT_SERVER=ftp.de.debian.org APT_PROXY="http://127.0.0.1:3142/" ./rpi2-gen-image.sh
             ENABLE_MINBASE=true ./rpi2-gen-image.sh
             BUILD_KERNEL=true ENABLE_MINBASE=true ENABLE_IPV6=false ./rpi2-gen-image.sh
             ```
             #### APT settings:
             ##### `APT_SERVER`="ftp.debian.org"
             Set Debian packages server address. Choose a server from the list of Debian worldwide [mirror sites](https://www.debian.org/mirror/list). Using a nearby server will probably speed-up all required downloads within the bootstrapping process.
             ##### `APT_PROXY`=""
             Set Proxy server address. Using a local Proxy-Cache like `apt-cacher-ng` will speed-up the bootstrapping process because all required Debian packages will only be downloaded from the Debian mirror site once.
             ##### `APT_INCLUDES`=""
             A comma seperated list of additional packages to be installed during bootstrapping.
             #### General system settings:
             ##### `HOSTNAME`="rpi2-jessie"
             Set system host name. It's recommended that the host name is unique in the corresponding subnet.
             ##### `PASSWORD`="raspberry"
             Set system `root` password. The same password is used for the created user `pi`. It's **STRONGLY** recommended that you choose a custom password.
             ##### `DEFLOCAL`="en_US.UTF-8"
             Set default system locale. This setting can also be changed inside the running OS using the `dpkg-reconfigure locales` command. The script variant `minbase` (ENABLE_MINBASE=true) doesn't install `locales`.
             ##### `TIMEZONE`="Europe/Berlin"
             Set default system timezone. All available timezones can be found in the `/usr/share/zoneinfo/` directory. This setting can also be changed inside the running OS using the `dpkg-reconfigure tzdata` command.
             ##### `EXPANDROOT`=true
             Expand the root partition and filesystem automatically on first boot.
             #### Keyboard settings:
             These options are used to configure keyboard layout in `/etc/default/keyboard` for console and Xorg. These settings can also be changed inside the running OS using the `dpkg-reconfigure keyboard-configuration` command.
             ##### `XKB_MODEL`=""
             Set the name of the model of your keyboard type.
             ##### `XKB_LAYOUT`=""
             Set the supported keyboard layout(s).
             ##### `XKB_VARIANT`=""
             Set the supported variant(s) of the keyboard layout(s).
             ##### `XKB_OPTIONS`=""
             Set extra xkb configuration options.
             #### Networking settings (DHCP):
             This setting is used to set up networking auto configuration in `/etc/systemd/network/eth.network`.
             #####`ENABLE_DHCP`=true
             Set the system to use DHCP. This requires an DHCP server.
             #### Networking settings (static):
             These settings are used to set up a static networking configuration in /etc/systemd/network/eth.network. The following static networking settings are only supported if `ENABLE_DHCP` was set to `false`.
             #####`NET_ADDRESS`=""
             Set a static IPv4 or IPv6 address and its prefix, separated by "/", eg. "192.169.0.3/24".
             #####`NET_GATEWAY`=""
             Set the IP address for the default gateway.
             #####`NET_DNS_1`=""
             Set the IP address for the first DNS server.
             #####`NET_DNS_2`=""
             Set the IP address for the second DNS server.
             #####`NET_DNS_DOMAINS`=""
             Set the default DNS search domains to use for non fully qualified host names.
             #####`NET_NTP_1`=""
             Set the IP address for the first NTP server.
             #####`NET_NTP_2`=""
             Set the IP address for the second NTP server.
             #### Basic system features:
             ##### `ENABLE_CONSOLE`=true
             Enable serial console interface. Recommended if no monitor or keyboard is connected to the RPi2. In case of problems fe. if the network (auto) configuration failed - the serial console can be used to access the system.
             ##### `ENABLE_IPV6`=true
             Enable IPv6 support. The network interface configuration is managed via systemd-networkd.
             ##### `ENABLE_SSHD`=true
             Install and enable OpenSSH service. The default configuration of the service doesn't allow `root` to login. Please use the user `pi` instead and `su -` or `sudo` to execute commands as root.
             ##### `ENABLE_RSYSLOG`=true
             If set to false, disable and uninstall rsyslog (so logs will be available only
             in journal files)
             ##### `ENABLE_SOUND`=true
             Enable sound hardware and install Advanced Linux Sound Architecture.
             ##### `ENABLE_HWRANDOM`=true
             Enable Hardware Random Number Generator. Strong random numbers are important for most network based communications that use encryption. It's recommended to be enabled.
             ##### `ENABLE_MINGPU`=false
             Minimize the amount of shared memory reserved for the GPU. It doesn't seem to be possible to fully disable the GPU.
             ##### `ENABLE_DBUS`=true
             Install and enable D-Bus message bus. Please note that systemd should work without D-bus but it's recommended to be enabled.
             ##### `ENABLE_XORG`=false
             Install Xorg open-source X Window System.
             ##### `ENABLE_WM`=""
             Install a user defined window manager for the X Window System. To make sure all X related package dependencies are getting installed `ENABLE_XORG` will automatically get enabled if `ENABLE_WM` is used. The `rpi2-gen-image.sh` script has been tested with the following list of window managers: `blackbox`, `openbox`, `fluxbox`, `jwm`, `dwm`, `xfce4`, `awesome`.
             #### Advanced system features:
             ##### `ENABLE_MINBASE`=false
             Use debootstrap script variant `minbase` which only includes essential packages and apt. This will reduce the disk usage by about 65 MB.
             ##### `ENABLE_UBOOT`=false
             Replace default RPi2 second stage bootloader (bootcode.bin) with U-Boot bootloader. U-Boot can boot images via the network using the BOOTP/TFTP protocol.
             ##### `ENABLE_FBTURBO`=false
             Install and enable the hardware accelerated Xorg video driver `fbturbo`. Please note that this driver is currently limited to hardware accelerated window moving and scrolling.
             ##### `ENABLE_IPTABLES`=false
             Enable iptables IPv4/IPv6 firewall. Simplified ruleset: Allow all outgoing connections. Block all incoming connections except to OpenSSH service.
             ##### `ENABLE_USER`=true
             Create pi user with password raspberry
             ##### `ENABLE_ROOT`=true
             Set root user password so root login will be enabled
             ##### `ENABLE_ROOT_SSH`=true
             Enable password root login via SSH. May be a security risk with default
             password, use only in trusted environments.
             ##### `ENABLE_HARDNET`=false
             Enable IPv4/IPv6 network stack hardening settings.
+            ##### `ENABLE_SPLITFS`=false
+            Enable having root partition on an USB drive by creating two image files: one for the `/boot/firmware` mount point, and another for `/`.
             ##### `CHROOT_SCRIPTS`=""
             Path to a directory with scripts that should be run in the chroot before the image is finally built. Every executable file in this direcory is run in lexicographical order.
             #### Kernel compilation:
             ##### `BUILD_KERNEL`=false
             Build and install the latest RPi2 linux kernel. Currently only the default RPi2 kernel configuration is used. Detailed configuration parameters for customizing the kernel and minor bug fixes still need to get implemented. feel free to help.
             ##### `KERNEL_THREADS`=1
             Number of parallel kernel building threads. If the parameter is left untouched the script will automatically determine the number of CPU cores to set the number of parallel threads to speed the kernel compilation.
             ##### `KERNEL_HEADERS`=true
             Install kernel headers with built kernel.
             ##### `KERNEL_RMSRC`=true
             Remove all kernel sources from the generated OS image after building.
             ## Understanding the script
             The functions of this script that are required for the different stages of the bootstrapping are split up into single files located inside the `bootstrap.d` directory. During the bootstrapping every script in this directory gets executed in lexicographical order:
             | Script | Description |
             | --- | --- |
             | `10-bootstrap.sh` | Debootstrap basic system |
             | `11-apt.sh` | Setup APT repositories |
             | `12-locale.sh` | Setup Locales and keyboard settings |
             | `13-kernel.sh` | Build and install RPi2 Kernel |
             | `20-networking.sh` | Setup Networking |
             | `21-firewall.sh` | Setup Firewall |
             | `30-security.sh` | Setup Users and Security settings |
             | `31-logging.sh` | Setup Logging |
             | `41-uboot.sh` | Build and Setup Uboot |
             | `42-fbturbo.sh` | Build and Setup fbturbo Xorg driver |
             | `50-firstboot.sh` | First boot actions |
             All the required configuration files that will be copied to the generated OS image are located inside the `files` directory. It is not recommended to modify these configuration files manually.
             | Directory | Description |
             | --- | --- |
             | `boot` | Boot and RPi2 configuration files |
             | `firstboot` | Scripts that get executed on first boot  |
             | `iptables` | Firewall configuration files |
             | `locales` | Locales configuration |
             | `modprobe.d` | Kernel Module Blacklist configuration |
             | `mount` | Fstab configuration |
             | `network` | Networking configuration files |
             | `sysctl.d` | Swapping and Network Hardening configuration |
             | `xorg` | fbturbo Xorg driver configuration |
             ## Logging of the bootstrapping process
             All information related to the bootstrapping process and the commands executed by the `rpi2-gen-image.sh` script can easily be saved into a logfile. The common shell command `script` can be used for this purpose:
             ```shell
             script -c 'APT_SERVER=ftp.de.debian.org ./rpi2-gen-image.sh' ./build.log
             ```
             ## Flashing the image file
             After the image file was successfully created by the `rpi2-gen-image.sh` script it can be copied to the microSD card that will be used by the RPi2 computer. This can be performed by using the tools `bmaptool` or `dd`. Using `bmaptool` will probably speed-up the copy process because `bmaptool` copies more wisely than `dd`.
             #####Flashing examples:
             ```shell
             bmaptool copy ./images/jessie/2015-12-13-debian-jessie.img /dev/mmcblk0
             dd bs=4M if=./images/jessie/2015-12-13-debian-jessie.img of=/dev/mmcblk0
             ```
+            If you have set `ENABLE_SPLITFS`, copy the `-frmw` image on the microSD card, then the `-root` one on the USB drive:
+            ```shell
+            bmaptool copy ./images/jessie/2015-12-13-debian-jessie-frmw.img /dev/mmcblk0
+            bmaptool copy ./images/jessie/2015-12-13-debian-jessie-root.img /dev/sdc
+            ```

bootstrap.d/13-kernel.sh +7 0

             #
             # Build and Setup RPi2 Kernel
             #
             # Load utility functions
             . ./functions.sh
             # Fetch and build latest raspberry kernel
             if [ "$BUILD_KERNEL" = true ] ; then
               # Fetch current raspberrypi kernel sources
               git -C $R/usr/src clone --depth=1 https://github.com/raspberrypi/linux
               # Load default raspberry kernel configuration
               make -C $R/usr/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig
               # Calculate optimal number of kernel building threads
               if [ "KERNEL_THREADS" = 1 ] ; then
                 if [ -f /proc/cpuinfo ] ; then
                   KERNEL_THREADS=$(grep -c processor /proc/cpuinfo)
                 fi
               fi
               # Cross compile kernel and modules
               make -C $R/usr/src/linux -j${KERNEL_THREADS} ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs
               # Install kernel modules
               make -C $R/usr/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=../../.. modules_install
               # Install kernel headers
               if [ "$KERNEL_HEADERS" = true ]; then
                 make -C $R/usr/src/linux ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_HDR_PATH=../.. headers_install
               fi
               # Copy and rename compiled kernel to boot directory
               mkdir $R/boot/firmware/
               $R/usr/src/linux/scripts/mkknlimg $R/usr/src/linux/arch/arm/boot/zImage $R/boot/firmware/kernel7.img
               # Copy dts and dtb device definitions
               mkdir $R/boot/firmware/overlays/
               cp $R/usr/src/linux/arch/arm/boot/dts/*.dtb $R/boot/firmware/
               cp $R/usr/src/linux/arch/arm/boot/dts/overlays/*.dtb* $R/boot/firmware/overlays/
               cp $R/usr/src/linux/arch/arm/boot/dts/overlays/README $R/boot/firmware/overlays/
               # Remove kernel sources
               if [ "$KERNEL_RMSRC" = true ]; then
                 rm -fr $R/usr/src/linux
               fi
               # Install raspberry bootloader and flash-kernel
               chroot_exec apt-get -qq -y --no-install-recommends install raspberrypi-bootloader-nokernel
             else
               # Kernel installation
               chroot_exec apt-get -qq -y --no-install-recommends install linux-image-${COLLABORA_KERNEL} raspberrypi-bootloader-nokernel
               # Install flash-kernel last so it doesn't try (and fail) to detect the platform in the chroot
               chroot_exec apt-get -qq -y install flash-kernel
               VMLINUZ="$(ls -1 $R/boot/vmlinuz-* | sort | tail -n 1)"
               [ -z "$VMLINUZ" ] && exit 1
               cp $VMLINUZ $R/boot/firmware/kernel7.img
             fi
             # Set up firmware boot cmdline
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              CMDLINE="dwc_otg.lpm_enable=0 root=/dev/sda1 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
+            else
               CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1 ${CMDLINE}"
+            fi
             # Set up serial console support (if requested)
             if [ "$ENABLE_CONSOLE" = true ] ; then
               CMDLINE="${CMDLINE} console=ttyAMA0,115200 kgdboc=ttyAMA0,115200"
             fi
             # Set up IPv6 networking support
             if [ "$ENABLE_IPV6" = false ] ; then
               CMDLINE="${CMDLINE} ipv6.disable=1"
             fi
             echo "${CMDLINE}" >$R/boot/firmware/cmdline.txt
             # Set up firmware config
             install_readonly files/boot/config.txt $R/boot/firmware/config.txt
             # Load snd_bcm2835 kernel module at boot time
             if [ "$ENABLE_SOUND" = true ] ; then
               echo "snd_bcm2835" >>$R/etc/modules
             fi
             # Set smallest possible GPU memory allocation size: 16MB (no X)
             if [ "$ENABLE_MINGPU" = true ] ; then
               echo "gpu_mem=16" >>$R/boot/firmware/config.txt
             fi
             # Create symlinks
             ln -sf firmware/config.txt $R/boot/config.txt
             ln -sf firmware/cmdline.txt $R/boot/cmdline.txt
             # Prepare modules-load.d directory
             mkdir -p $R/lib/modules-load.d/
             # Load random module on boot
             if [ "$ENABLE_HWRANDOM" = true ] ; then
               cat <<EOM >$R/lib/modules-load.d/rpi2.conf
             bcm2708_rng
             EOM
             fi
             # Prepare modprobe.d directory
             mkdir -p $R/etc/modprobe.d/
             # Blacklist sound modules
             install_readonly files/modprobe.d/raspi-blacklist.conf $R/etc/modprobe.d/raspi-blacklist.conf
             # Create default fstab
             install_readonly files/mount/fstab $R/etc/fstab
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              sed -i 's/mmcblk0p2/sda1/' $R/etc/fstab
+            fi
             # Avoid swapping and increase cache sizes
             install_readonly files/sysctl.d/81-rpi-vm.conf $R/etc/sysctl.d/81-rpi-vm.conf

bootstrap.d/20-networking.sh +1 -1

             #
             # Setup Networking
             #
             # Load utility functions
             . ./functions.sh
             # Set up IPv4 hosts
             install_readonly files/network/hostname $R/etc/hostname
             sed -i -e "s/^rpi2-jessie/${HOSTNAME}/" $R/etc/hostname
             install_readonly files/network/hosts $R/etc/hosts
             sed -i -e "s/rpi2-jessie/${HOSTNAME}/" $R/etc/hosts
             if [ "$NET_ADDRESS" != "" ] ; then
               NET_IP=$(echo ${NET_ADDRESS} | cut -f 1 -d'/')
               sed -i "s/^127.0.1.1/${NET_IP}/" $R/etc/hosts
             fi
             # Set up IPv6 hosts
             if [ "$ENABLE_IPV6" = true ] ; then
               cat <<EOM >>$R/etc/hosts
             ::1             localhost ip6-localhost ip6-loopback
             ff02::1         ip6-allnodes
             ff02::2         ip6-allrouters
             EOM
             fi
             # Place hint about network configuration
             install_readonly files/network/interfaces $R/etc/network/interfaces
             if [ "$ENABLE_DHCP" = true ] ; then
             # Enable systemd-networkd DHCP configuration for interface eth0
             install_readonly files/network/eth.network $R/etc/systemd/network/eth.network
             # Set DHCP configuration to IPv4 only
               if [ "$ENABLE_IPV6" = false ] ; then
                 sed -i "s/^DHCP=yes/DHCP=v4/" $R/etc/systemd/network/eth.network
               fi
             else # ENABLE_DHCP=false
               cat <<EOM >$R/etc/systemd/network/eth.network
             [Match]
             Name=eth0
             [Network]
             DHCP=no
             Address=${NET_ADDRESS}
             Gateway=${NET_GATEWAY}
             DNS=${NET_DNS_1}
             DNS=${NET_DNS_2}
             Domains=${NET_DNS_DOMAINS}
             NTP=${NET_NTP_1}
             NTP=${NET_NTP_2}
             EOM
             fi
             # Enable systemd-networkd service
             chroot_exec systemctl enable systemd-networkd
             # Enable network stack hardening
             if [ "$ENABLE_HARDNET" = true ] ; then
-              install_readonly files/sysctl.d/81-rpi-net-hardening.conf $R/etc/sysctl.d/81-rpi-net-hardening.conf
+              install_readonly files/sysctl.d/82-rpi-net-hardening.conf $R/etc/sysctl.d/82-rpi-net-hardening.conf
             # Enable resolver warnings about spoofed addresses
               cat <<EOM >>$R/etc/host.conf
             spoof warn
             EOM
             fi

functions.sh +2 -2

             # This file contains utility functions used by rpi2-gen-image.sh
             cleanup (){
               set +x
               set +e
               # Identify and kill all processes still using files
               echo "killing processes using mount point ..."
               fuser -k $R
               sleep 3
               fuser -9 -k -v $R
               # Clean up all temporary mount points
               echo "removing temporary mount points ..."
               umount -l $R/proc 2> /dev/null
               umount -l $R/sys 2> /dev/null
               umount -l $R/dev/pts 2> /dev/null
               umount "$BUILDDIR/mount/boot/firmware" 2> /dev/null
               umount "$BUILDDIR/mount" 2> /dev/null
-              losetup -d "$EXT4_LOOP" 2> /dev/null
+              losetup -d "$ROOT_LOOP" 2> /dev/null
-              losetup -d "$VFAT_LOOP" 2> /dev/null
+              losetup -d "$FRMW_LOOP" 2> /dev/null
               trap - 0 1 2 3 6
             }
             chroot_exec() {
               # Exec command in chroot
               LANG=C LC_ALL=C DEBIAN_FRONTEND=noninteractive chroot $R $*
             }
             install_readonly() {
               # Install file with user read-only permissions
               install -o root -g root -m 644 $*
             }
             install_exec() {
               # Install file with root exec permissions
               install -o root -g root -m 744 $*
             }

rpi2-gen-image.sh +52 -13

             #!/bin/sh
             ########################################################################
             # rpi2-gen-image.sh					   ver2a 12/2015
             #
             # Advanced debian "jessie" bootstrap script for RPi2
             #
             # This program is free software; you can redistribute it and/or
             # modify it under the terms of the GNU General Public License
             # as published by the Free Software Foundation; either version 2
             # of the License, or (at your option) any later version.
             #
             # some parts based on rpi2-build-image:
             # Copyright (C) 2015 Ryan Finnie <ryan@finnie.org>
             # Copyright (C) 2015 Luca Falavigna <dktrkranz@debian.org>
             ########################################################################
             # Load utility functions
             . ./functions.sh
             set -e
             echo -n -e "\n#\n# RPi2 Bootstrap Settings\n#\n"
             set -x
             # Debian release
             RELEASE=${RELEASE:=jessie}
             COLLABORA_KERNEL=${COLLABORA_KERNEL:=3.18.0-trunk-rpi2}
             # Build settings
             BASEDIR=$(pwd)/images/${RELEASE}
             BUILDDIR=${BASEDIR}/build
             # General settings
             HOSTNAME=${HOSTNAME:=rpi2-${RELEASE}}
             PASSWORD=${PASSWORD:=raspberry}
             DEFLOCAL=${DEFLOCAL:="en_US.UTF-8"}
             TIMEZONE=${TIMEZONE:="Europe/Berlin"}
             EXPANDROOT=${EXPANDROOT:=true}
             # Keyboard settings
             XKB_MODEL=${XKB_MODEL:=""}
             XKB_LAYOUT=${XKB_LAYOUT:=""}
             XKB_VARIANT=${XKB_VARIANT:=""}
             XKB_OPTIONS=${XKB_OPTIONS:=""}
             # Network settings (DHCP)
             ENABLE_DHCP=${ENABLE_DHCP:=true}
             # Network settings (static)
             # only used on ENABLE_DHCP=false
             NET_ADDRESS=${NET_ADDRESS:=""}
             NET_GATEWAY=${NET_GATEWAY:=""}
             NET_DNS_1=${NET_DNS_1:=""}
             NET_DNS_2=${NET_DNS_2:=""}
             NET_DNS_DOMAINS=${NET_DNS_DOMAINS:=""}
             NET_NTP_1=${NET_NTP_1:=""}
             NET_NTP_2=${NET_NTP_2:=""}
             # APT settings
             APT_PROXY=${APT_PROXY:=""}
             APT_SERVER=${APT_SERVER:="ftp.debian.org"}
             # Feature settings
             ENABLE_CONSOLE=${ENABLE_CONSOLE:=true}
             ENABLE_IPV6=${ENABLE_IPV6:=true}
             ENABLE_SSHD=${ENABLE_SSHD:=true}
             ENABLE_SOUND=${ENABLE_SOUND:=true}
             ENABLE_DBUS=${ENABLE_DBUS:=true}
             ENABLE_HWRANDOM=${ENABLE_HWRANDOM:=true}
             ENABLE_MINGPU=${ENABLE_MINGPU:=false}
             ENABLE_XORG=${ENABLE_XORG:=false}
             ENABLE_WM=${ENABLE_WM:=""}
             ENABLE_RSYSLOG=${ENABLE_RSYSLOG:=true}
             ENABLE_USER=${ENABLE_USER:=true}
             ENABLE_ROOT=${ENABLE_ROOT:=false}
             ENABLE_ROOT_SSH=${ENABLE_ROOT_SSH:=false}
             # Advanced settings
             ENABLE_MINBASE=${ENABLE_MINBASE:=false}
             ENABLE_UBOOT=${ENABLE_UBOOT:=false}
             ENABLE_FBTURBO=${ENABLE_FBTURBO:=false}
             ENABLE_HARDNET=${ENABLE_HARDNET:=false}
             ENABLE_IPTABLES=${ENABLE_IPTABLES:=false}
+            ENABLE_SPLITFS=${ENABLE_SPLITFS:=false}
             # Kernel compilation settings
             BUILD_KERNEL=${BUILD_KERNEL:=false}
             KERNEL_THREADS=${KERNEL_THREADS:=1}
             KERNEL_HEADERS=${KERNEL_HEADERS:=true}
             KERNEL_RMSRC=${KERNEL_RMSRC:=true}
             # Image chroot path
             R=${BUILDDIR}/chroot
             CHROOT_SCRIPTS=${CHROOT_SCRIPTS:=""}
             # Packages required for bootstrapping
             REQUIRED_PACKAGES="debootstrap debian-archive-keyring qemu-user-static binfmt-support dosfstools rsync bmap-tools whois git-core"
             # Missing packages that need to be installed
             MISSING_PACKAGES=""
             # Packages required in the chroot build environment
             APT_INCLUDES=${APT_INCLUDES:=""}
             APT_INCLUDES="${APT_INCLUDES},apt-transport-https,ca-certificates,debian-archive-keyring,dialog,sudo"
             set +x
             # Are we running as root?
             if [ "$(id -u)" -ne "0" ] ; then
               echo "this script must be executed with root privileges"
               exit 1
             fi
             # Add packages required for kernel cross compilation
             if [ "$BUILD_KERNEL" = true ] ; then
               REQUIRED_PACKAGES="${REQUIRED_PACKAGES} crossbuild-essential-armhf"
             fi
             # Check if all required packages are installed
             for package in $REQUIRED_PACKAGES ; do
               if [ "`dpkg-query -W -f='${Status}' $package`" != "install ok installed" ] ; then
                 MISSING_PACKAGES="$MISSING_PACKAGES $package"
               fi
             done
             # Ask if missing packages should get installed right now
             if [ -n "$MISSING_PACKAGES" ] ; then
               echo "the following packages needed by this script are not installed:"
               echo "$MISSING_PACKAGES"
               echo -n "\ndo you want to install the missing packages right now? [y/n] "
               read confirm
               if [ "$confirm" != "y" ] ; then
                 exit 1
               fi
             fi
             # Make sure all required packages are installed
             apt-get -qq -y install ${REQUIRED_PACKAGES}
             # Don't clobber an old build
             if [ -e "$BUILDDIR" ]; then
               echo "directory $BUILDDIR already exists, not proceeding"
               exit 1
             fi
             set -x
             # Call "cleanup" function on various signals and errors
             trap cleanup 0 1 2 3 6
             # Set up chroot directory
             mkdir -p $R
             # Add required packages for the minbase installation
             if [ "$ENABLE_MINBASE" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},vim-tiny,netbase,net-tools"
             else
               APT_INCLUDES="${APT_INCLUDES},locales,keyboard-configuration,console-setup"
             fi
             # Add parted package, required to get partprobe utility
             if [ "$EXPANDROOT" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},parted"
             fi
             # Add dbus package, recommended if using systemd
             if [ "$ENABLE_DBUS" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},dbus"
             fi
             # Add iptables IPv4/IPv6 package
             if [ "$ENABLE_IPTABLES" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},iptables"
             fi
             # Add openssh server package
             if [ "$ENABLE_SSHD" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},openssh-server"
             fi
             # Add alsa-utils package
             if [ "$ENABLE_SOUND" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},alsa-utils"
             fi
             # Add rng-tools package
             if [ "$ENABLE_HWRANDOM" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},rng-tools"
             fi
             if [ "$ENABLE_USER" = true ]; then
               APT_INCLUDES="${APT_INCLUDES},sudo"
             fi
             # Add fbturbo video driver
             if [ "$ENABLE_FBTURBO" = true ] ; then
               # Enable xorg package dependencies
               ENABLE_XORG=true
             fi
             # Add user defined window manager package
             if [ -n "$ENABLE_WM" ] ; then
               APT_INCLUDES="${APT_INCLUDES},${ENABLE_WM}"
               # Enable xorg package dependencies
               ENABLE_XORG=true
             fi
             # Add xorg package
             if [ "$ENABLE_XORG" = true ] ; then
               APT_INCLUDES="${APT_INCLUDES},xorg"
             fi
             ## Main bootstrap
             for i in bootstrap.d/*.sh; do
               head -n 3 $i
               . $i
             done
             ## Custom bootstrap scripts
             if [ -d "custom.d" ]; then
               for i in custom.d/*.sh; do
                 . $i
               done
             fi
             # Invoke custom scripts
             if [ -n "${CHROOT_SCRIPTS}" ]; then
               cp -r "${CHROOT_SCRIPTS}" "${R}/chroot_scripts"
               LANG=C chroot $R bash -c 'for SCRIPT in /chroot_scripts/*; do if [ -f $SCRIPT -a -x $SCRIPT ]; then $SCRIPT; fi done;'
               rm -rf "${R}/chroot_scripts"
             fi
             ## Cleanup
             chroot_exec apt-get -y clean
             chroot_exec apt-get -y autoclean
             chroot_exec apt-get -y autoremove
             # Unmount mounted filesystems
             umount -l $R/proc
             umount -l $R/sys
             # Clean up files
             rm -f $R/etc/apt/sources.list.save
             rm -f $R/etc/resolvconf/resolv.conf.d/original
             rm -rf $R/run
             mkdir -p $R/run
             rm -f $R/etc/*-
             rm -f $R/root/.bash_history
             rm -rf $R/tmp/*
             rm -f $R/var/lib/urandom/random-seed
             [ -L $R/var/lib/dbus/machine-id ] || rm -f $R/var/lib/dbus/machine-id
             rm -f $R/etc/machine-id
             rm -fr $R/etc/apt/apt.conf.d/10proxy
             rm -f $R/etc/resolv.conf
             # Calculate size of the chroot directory in KB
             CHROOT_SIZE=$(expr `du -s $R | awk '{ print $1 }'`)
             # Calculate the amount of needed 512 Byte sectors
             TABLE_SECTORS=$(expr 1 \* 1024 \* 1024 \/ 512)
-            BOOT_SECTORS=$(expr 64 \* 1024 \* 1024 \/ 512)
+            FRMW_SECTORS=$(expr 64 \* 1024 \* 1024 \/ 512)
-            ROOT_OFFSET=$(expr ${TABLE_SECTORS} + ${BOOT_SECTORS})
+            ROOT_OFFSET=$(expr ${TABLE_SECTORS} + ${FRMW_SECTORS})
             # The root partition is EXT4
             # This means more space than the actual used space of the chroot is used.
             # As overhead for journaling and reserved blocks 20% are added.
             ROOT_SECTORS=$(expr $(expr ${CHROOT_SIZE} + ${CHROOT_SIZE} \/ 100 \* 20) \* 1024 \/ 512)
             # Calculate required image size in 512 Byte sectors
-            IMAGE_SECTORS=$(expr ${TABLE_SECTORS} + ${BOOT_SECTORS} + ${ROOT_SECTORS})
+            IMAGE_SECTORS=$(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} + ${ROOT_SECTORS})
             # Prepare date string for image file name
             DATE="$(date +%Y-%m-%d)"
             # Prepare image file
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" bs=512 count=${TABLE_SECTORS}
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" bs=512 count=0 seek=${FRMW_SECTORS}
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-root.img" bs=512 count=${TABLE_SECTORS}
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-root.img" bs=512 count=0 seek=${ROOT_SECTORS}
+              # Write partition tables
+              sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" <<EOM
+            unit: sectors
+: start=   ${TABLE_SECTORS}, size=   ${FRMW_SECTORS}, Id= c, bootable
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+            EOM
+              sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}-root.img" <<EOM
+            unit: sectors
+: start=   ${TABLE_SECTORS}, size=   ${ROOT_SECTORS}, Id=83
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+            EOM
+              # Set up temporary loop devices
+              FRMW_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}-frmw.img)"
+              ROOT_LOOP="$(losetup -o 1M -f --show $BASEDIR/${DATE}-debian-${RELEASE}-root.img)"
+            else
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=512 count=${TABLE_SECTORS}
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=512 count=0 seek=${IMAGE_SECTORS}
               # Write partition table
               sfdisk -q -f "$BASEDIR/${DATE}-debian-${RELEASE}.img" <<EOM
             unit: sectors
-: start=   ${TABLE_SECTORS}, size=   ${BOOT_SECTORS}, Id= c, bootable
+: start=   ${TABLE_SECTORS}, size=   ${FRMW_SECTORS}, Id= c, bootable
 : start=     ${ROOT_OFFSET}, size=   ${ROOT_SECTORS}, Id=83
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
             EOM
+              # Set up temporary loop devices
+              FRMW_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
+              ROOT_LOOP="$(losetup -o 65M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
+            fi
-            # Set up temporary loop devices and build filesystems
+            # Build filesystems
-            VFAT_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
+            mkfs.vfat "$FRMW_LOOP"
-            EXT4_LOOP="$(losetup -o 65M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
+            mkfs.ext4 "$ROOT_LOOP"
-            mkfs.vfat "$VFAT_LOOP"
-            mkfs.ext4 "$EXT4_LOOP"
             # Mount the temporary loop devices
             mkdir -p "$BUILDDIR/mount"
-            mount "$EXT4_LOOP" "$BUILDDIR/mount"
+            mount "$ROOT_LOOP" "$BUILDDIR/mount"
             mkdir -p "$BUILDDIR/mount/boot/firmware"
-            mount "$VFAT_LOOP" "$BUILDDIR/mount/boot/firmware"
+            mount "$FRMW_LOOP" "$BUILDDIR/mount/boot/firmware"
             # Copy all files from the chroot to the loop device mount point directory
             rsync -a "$R/" "$BUILDDIR/mount/"
             # Unmount all temporary loop devices and mount points
             cleanup
+            # Create block map file(s) of image(s)
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              # Create block map files for "bmaptool"
+              bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img"
+              bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}-root.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}-root.img"
+              # Image was successfully created
+              echo "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img ($(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} \* 512 \/ 1024 \/ 1024)M)" ": successfully created"
+              echo "$BASEDIR/${DATE}-debian-${RELEASE}-root.img ($(expr ${TABLE_SECTORS} + ${ROOT_SECTORS} \* 512 \/ 1024 \/ 1024)M)" ": successfully created"
+            else
               # Create block map file for "bmaptool"
               bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}.img"
               # Image was successfully created
-            echo "$BASEDIR/${DATE}-debian-${RELEASE}.img (${IMAGE_SIZE})" ": successfully created"
+              echo "$BASEDIR/${DATE}-debian-${RELEASE}.img ($(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} + ${ROOT_SECTORS} \* 512 \/ 1024 \/ 1024)M)" ": successfully created"
+            fi

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