(Added UBI/MTD Utilities)
(Building an Emdebian (Embedded Debian) root filesystem for GuruPlug/armel)
Line 7: Line 7:
  
 
Debian is now my choice for a root filesystem on the GuruPlug.
 
Debian is now my choice for a root filesystem on the GuruPlug.
 +
 +
=== Building your Debian rootfs ===
  
 
To build your root filesystem, create a multistrap configuration file called GuruPlugRootFS.conf and add the following:
 
To build your root filesystem, create a multistrap configuration file called GuruPlugRootFS.conf and add the following:
Line 49: Line 51:
 
# LC_ALL=C LANGUAGE=C LANG=C chroot guruplug-rootfs dpkg --configure -a
 
# LC_ALL=C LANGUAGE=C LANG=C chroot guruplug-rootfs dpkg --configure -a
 
</PRE>
 
</PRE>
 +
 +
=== Root Password ===
  
 
Set your root password:
 
Set your root password:
Line 55: Line 59:
 
# sudo chroot guruplug-rootfs passwd
 
# sudo chroot guruplug-rootfs passwd
 
</PRE>
 
</PRE>
 +
 +
=== Other Miscellaneous Configurations ===
  
 
Set your hostname:
 
Set your hostname:
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# echo proc /proc proc defaults 0 0 >> guruplug-rootfs/etc/fstab
 
# echo proc /proc proc defaults 0 0 >> guruplug-rootfs/etc/fstab
 
</PRE>
 
</PRE>
 +
 +
=== Set-up Terminal on Serial Console ===
  
 
If you desire to have a terminal available on the serial/console port, you will need to edit /etc/inittab and modify/uncomment:
 
If you desire to have a terminal available on the serial/console port, you will need to edit /etc/inittab and modify/uncomment:
Line 82: Line 90:
 
T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100
 
T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100
 
</PRE>
 
</PRE>
 +
 +
=== UBI/MTD Utilities ===
  
 
If you are planning on making an [[GuruPlug_Building_RootFS|UBI filesystem]] it may be advantageous to add your UBI MTD utilities at this stage. We have  [[Cross_Compiling_MTD_Utils_for_ARM|instructions to build them here]], or you can use some with prepared earlier:
 
If you are planning on making an [[GuruPlug_Building_RootFS|UBI filesystem]] it may be advantageous to add your UBI MTD utilities at this stage. We have  [[Cross_Compiling_MTD_Utils_for_ARM|instructions to build them here]], or you can use some with prepared earlier:
Line 88: Line 98:
 
wget http://wiki.beyondlogic.org/prebuilt/mtdutils-1.5.0-arm-linux-gnueabi.tar.bz2
 
wget http://wiki.beyondlogic.org/prebuilt/mtdutils-1.5.0-arm-linux-gnueabi.tar.bz2
 
tar -xjf mtdutils-1.5.0-arm-linux-gnueabi.tar.bz2 -C guruplug-rootfs
 
tar -xjf mtdutils-1.5.0-arm-linux-gnueabi.tar.bz2 -C guruplug-rootfs
 +
</PRE>
 +
 +
=== Kernel Modules ===
 +
 +
Your root filesystem needs to be populated with any kernel modules corresponding to the Linux kernel version you are using.
 +
 +
Jump to the folder containing your kernel and execute:
 +
 +
<PRE>
 +
# make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules
 +
# make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- INSTALL_MOD_PATH=<path of your guruplug-rootfs> modules_install
 
</PRE>
 
</PRE>

Revision as of 07:07, 30 March 2014

Building an Emdebian (Embedded Debian) root filesystem for GuruPlug/armel

Many of the distros are dropping support for ARMv5 and when you do find one, today's 'minimal' root filesystem is typically a couple hundred of megabytes.

Emdebian (Embedded Debian) has the advantage that not only still supporting ARMv5, but it has a multistrap tool that gives the ability to customise the root filesystem on the host and only include the packages you need.

Debian is now my choice for a root filesystem on the GuruPlug.

Building your Debian rootfs

To build your root filesystem, create a multistrap configuration file called GuruPlugRootFS.conf and add the following:

[General]
arch=armel
directory=guruplug-rootfs
cleanup=true
noauth=true
unpack=true
debootstrap=Emdebian Net Utils
aptsources=Emdebian 

[Emdebian]
packages=apt
source=http://www.emdebian.org/grip
keyring=emdebian-archive-keyring
suite=wheezy-grip

[Net]
#Basic packages to enable the networking
packages=netbase net-tools ethtool udev iproute iputils-ping ifupdown isc-dhcp-client ssh 
source=http://www.emdebian.org/grip

[Utils]
#General purpose utilities
packages=locales adduser nano less wget vim rsyslog dialog
source=http://www.emdebian.org/grip

Save and run the multistrap tool:

# multistrap -f GuruPlugRootFS.conf

Now configure the Emdebian packages with the QEMU emulator. This will configure various packages, set your shell and time zone.

# cp /usr/bin/qemu-arm-static guruplug-rootfs/usr/bin
# LC_ALL=C LANGUAGE=C LANG=C chroot guruplug-rootfs dpkg --configure -a

Root Password

Set your root password:

# sudo chroot guruplug-rootfs passwd

Other Miscellaneous Configurations

Set your hostname:

# echo guruplug >> guruplug-rootfs/etc/hostname

Initialise your fstab:

# echo proc /proc proc defaults 0 0 >> guruplug-rootfs/etc/fstab

Set-up Terminal on Serial Console

If you desire to have a terminal available on the serial/console port, you will need to edit /etc/inittab and modify/uncomment:

# Example how to put a getty on a serial line (for a terminal)
#
#T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
#T1:23:respawn:/sbin/getty -L ttyS1 9600 vt100

I use

T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100

UBI/MTD Utilities

If you are planning on making an UBI filesystem it may be advantageous to add your UBI MTD utilities at this stage. We have instructions to build them here, or you can use some with prepared earlier:

wget http://wiki.beyondlogic.org/prebuilt/mtdutils-1.5.0-arm-linux-gnueabi.tar.bz2
tar -xjf mtdutils-1.5.0-arm-linux-gnueabi.tar.bz2 -C guruplug-rootfs

Kernel Modules

Your root filesystem needs to be populated with any kernel modules corresponding to the Linux kernel version you are using.

Jump to the folder containing your kernel and execute:

# make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules
# make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- INSTALL_MOD_PATH=<path of your guruplug-rootfs> modules_install