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====== How to build uSomIQ Linux kernel with Device Tree support ======
This page describes to how deploy the Ubuntu OS and Debian on a uSomIQ COM.

These instructions were adapted from the ones provided by Robert Nelson available here:\\
[[http://eewiki.net/display/linuxonarm/BeagleBone+Black]]

===== Basic Requirements =====

  * ARM Cross Compiler
    * Linaro: [https://launchpad.net/linaro-toolchain-binaries]
  * Bootloader
    * Das U-Boot -- the Universal Boot Loader [http://www.denx.de/wiki/U-Boot]
    * Source -- [http://git.denx.de/?p=u-boot.git;a=summary]
  * Linux Kernel
    * Linus's Mainline tree: [http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=summary]
  * ARM based rootfs
    * Debian Squeeze: [http://www.debian.org/]

===== GCC Toolchain =====

<code>
wget -c https://releases.linaro.org/14.04/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.xz
tar xf gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.xz
export CC=`pwd`/gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux/bin/arm-linux-gnueabihf-
</code>

===== Bootloader =====

Das U-Boot -- the Universal Boot Loader [http://www.denx.de/wiki/U-Boot]

==== U-Boot Download ====

Download U-Boot via git:
<code>
git clone git://git.denx.de/u-boot.git
cd u-boot/
git checkout v2014.10 -b tmp
</code>

==== U-Boot Patches ====

<code>
wget http://www.mentorel.com/downloads/usomiq/patches/u-boot-usomiq-v2014.10.patch
patch -p1 < u-boot-usomiq-v2014.10.patch
</code>

==== U-Boot Configure and Build ====

<code>
make ARCH=arm CROSS_COMPILE=${CC} distclean
make ARCH=arm CROSS_COMPILE=${CC} am335x_evm_config
make ARCH=arm CROSS_COMPILE=${CC}
</code>

===== Upgrade distro "device-tree-compiler" package =====
<code>
wget -c https://raw.github.com/RobertCNelson/tools/master/pkgs/dtc.sh
chmod +x dtc.sh
./dtc.sh
</code>

===== Linux Kernel =====

<code>
git clone https://github.com/RobertCNelson/bb-kernel.git
cd bb-kernel/
</code>

==== v3.8.x branch (full cape support) ====
<code>
git checkout origin/am33x-v3.8 -b tmp
</code>
Download a patch to enable uSomIQ support in kernel
<code>
wget http://www.mentorel.com/downloads/usomiq/patches/add-usomiq-v3.8.patch
patch -p1 < add-usomiq-v3.8.patch
</code>

==== v3.15.x branch (better usb and ethernet) ====
..coming soon

Run Build Script:
<code>
./build_kernel.sh
</code>

The kernel zImage and modules will be under the deploy directory.


====== Root File System ======
===== Debian 7.0.0 (Wheezy) Root File System =====

This file system is very small and can be installed to the NAND flash on uSomIQ. It is not that small like Angstrom minimal distribution (~20M), but will require around 75M on the flash. However it is a real Debian system with apt-get utility installed.

Default User: debian
Password: temppwd

Root User: root
Root Password: root

<code>
wget -c https://rcn-ee.net/deb/minfs/wheezy/debian-7.5-minimal-armhf-2014-07-07.tar.xz
</code>
verify the image with:
<code>
md5sum debian-7.5-minimal-armhf-2014-07-07.tar.xz
cae9e0cfac14fd6aa19d4c17357aecc8 debian-7.5-minimal-armhf-2014-07-07.tar.xz
</code>
Extract Image:
<code>
tar xf debian-7.5-minimal-armhf-2014-07-07.tar.xz
</code>
Now you have a directory with the archived (tar) file system itself and a file with user names/passwords.

===== Ubuntu 14.04 Root File System =====

Default User: ubuntu
Password: temppwd

<code>
wget -c https://rcn-ee.net/deb/minfs/trusty/ubuntu-14.04-minimal-armhf-2014-07-07.tar.xz
</code>
verify the image with:
<code>
md5sum ubuntu-14.04-minimal-armhf-2014-07-07.tar.xz
c30fb91012701cdbfa00bb6c86868d0a ubuntu-14.04-minimal-armhf-2014-07-07.tar.xz
</code>
Extract Image:
<code>
tar xJf ubuntu-14.04-minimal-armhf-2014-07-07.tar.xz
</code>
 Now you have a directory with the archived (tar) file system itself and a file with user names/passwords.

===== Root File System for NAND =====
A Root File System around 64Mb in size, for flash applications.

**Debian 7 (small flash)**
^ User ^ Password ^
| debian | temppwd |
| root | root |

Download: 
<code>
wget -c https://rcn-ee.net/deb/barefs/wheezy/debian-7.5-bare-armhf-2014-07-07.tar.xz
</code>

Verify: 
<code>
md5sum debian-7.5-bare-armhf-2014-07-07.tar.xz
a5f0e75e5ad16bb110d4291f54ed6cb9  debian-7.5-bare-armhf-2014-07-07.tar.xz
</code>
Extract:
<code>
tar xJf debian-7.5-bare-armhf-2014-07-07.tar.xz
</code>
====== Install Ubuntu/Debian ======
===== SD card =====

==== Setup microSD card ====

For these instruction, we are assuming: DISK=/dev/mmcblk0, "sudo fdisk \-l" is useful for determining the device id..
<code>
export DISK=/dev/mmcblk0
</code>

Erase microSD card:
<code>
sudo dd if=/dev/zero of=${DISK} bs=1024 count=1024
sudo parted --script ${DISK} mklabel msdos
</code>

Setup Boot Partition:
<code>
sudo fdisk ${DISK} << __EOF__
n
p
1

+64M
t
e
p
w
__EOF__
</code>

Set Boot Flag
<code>
sudo parted --script ${DISK} set 1 boot on
</code>

Format Boot Partition as vfat:
<code>
DISK=/dev/mmcblk0
sudo mkfs.vfat -F 16 ${DISK}p1 -n boot
(or)
DISK=/dev/sdX
sudo mkfs.vfat -F 16 ${DISK}1 -n boot
</code>

Setup Root File System Partition:
<code>
sudo fdisk ${DISK} << __EOF__
n
p
2


w
__EOF__
</code>

Format rootfs as ext4:
<code>
DISK=/dev/mmcblk0
sudo mkfs.ext4 ${DISK}p2 -L rootfs
(or)
DISK=/dev/sdX
sudo mkfs.ext4 ${DISK}2 -L rootfs
</code>

==== Mount Partitions ====

*Note: On most systems these partitions will be auto-mounted...*

<code>
sudo mkdir -p /media/boot/
sudo mkdir -p /media/rootfs/

DISK=/dev/mmcblk0
sudo mount ${DISK}p1 /media/boot/
sudo mount ${DISK}p2 /media/rootfs/

(or)

DISK=/dev/sdX
sudo mount ${DISK}1 /media/boot/
sudo mount ${DISK}2 /media/rootfs/
</code>

==== Install Bootloaders ====

Copy MLO/u-boot.img to the boot partition
<code>
sudo cp -v ./u-boot/MLO /media/boot/
sudo cp -v ./u-boot/u-boot.img /media/boot/
</code>

==== uEnv.txt based bootscript ====

Create "uEnv.txt" boot script: (nano uEnv.txt)
<code>
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=ext4 rootwait fixrtc
 
loadfdt=load mmc ${bootpart} ${fdtaddr} ${bootdir}/dtbs/${fdtfile}

##Un-comment to enable systemd in Debian Wheezy
#optargs=quiet init=/lib/systemd/systemd
</code>

Copy uEnv.txt to the boot partition:
<code>
sudo cp -v ./uEnv.txt /media/boot/
</code>

==== Install Kernel and Root File System ====


To help new users, since the kernel version can change on a daily basis. The kernel building scripts in this git repo will now give you a hint of what kernel version was built.
<code>
-----------------------------
Script Complete
eewiki.net: [user@localhost:~$ export kernel_version=3.X.Y-Z]
-----------------------------
</code>

Copy and Paste that "export kernel_version=3.X.Y-Z" exactly as shown in your own build/desktop environment:
<code>
export kernel_version=3.X.Y-Z
</code>

Copy Root File System:
<code>
sudo tar xfvp ./*-*-minimal-arm*-*/arm*-rootfs-*.tar -C /media/rootfs/
</code>

Copy Kernel zImage:
<code>
sudo cp -v ./linux-dev/deploy/${kernel_version}.zImage /media/rootfs/boot/zImage
</code>

Kernel Device Tree Binaries:
<code>
sudo mkdir -p /media/rootfs/boot/dtbs/
sudo tar xfov ./bb-kernel/deploy/${kernel_version}-dtbs.tar.gz -C /media/rootfs/boot/dtbs/
sudo tar xfv ./bb-kernel/deploy/${kernel_version}-firmware.tar.gz -C /media/rootfs/lib/firmware/
</code>

Copy Kernel modules:
<code>
sudo tar xfv ./linux-dev/deploy/${kernel_version}-modules.tar.gz -C /media/rootfs/
</code>

Setup /etc/fstab:
<code>
sudo nano /media/rootfs/etc/fstab
</code>
Add:
<code>
/dev/mmcblk0p2   /           auto   errors=remount-ro   0   1
/dev/mmcblk0p1   /boot/uboot auto   defaults            0   0
</code>

=== Enable Networking ===

<code>
sudo nano /media/rootfs/etc/network/interfaces
</code>
Add:
<code>

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
</code>

=== Enable Serial Login ===

**Debian:**
<code>
sudo nano /media/rootfs/etc/inittab
</code>
Add at end of file:
<code>
T0:23:respawn:/sbin/getty -L ttyO0 115200 vt102
</code>

**Ubuntu:**
<code>
sudo nano /media/rootfs/etc/init/serial.conf
</code>
Add:
<code>
start on stopped rc RUNLEVEL=[2345]
stop on runlevel [!2345]

respawn
exec /sbin/getty 115200 ttyO0
</code>

Remove microSD card:
<code>
sync
sudo umount /media/boot
sudo umount /media/rootfs
</code>

===== Install Debian to NAND =====

Here you will learn how install Debian to a UBIFS partition on a uSomIQ system on module.

1) Install Ubuntu or Debian to a SD card as described in the previous step

2) Download and extract a small Debian file system as described [[#root_file_system_for_nand]]

You will have an archive debian-7.5-bare-armhf-2014-07-07.tar after extracting. Place this archive to the SD card with OS installed in the previous step.

3) Boot the board with the SD card to u-boot and issue the following commands:
<code>
nand erase.chip
mmc rescan
load mmc 0 ${loadaddr} MLO
nand write ${loadaddr} SPL
nand write ${loadaddr} SPL.backup1
</code>
Load the u-boot image u-boot.img to NAND. Note that we use the actual size of the u-boot.img file in Hex. If your file has a different size then update this number
<code>
load mmc 0 ${loadaddr} u-boot.img
nand write ${loadaddr} u-boot
</code>
Load the device tree binary
<code>
run loadbootenv
run importbootenv
run findfdt
run loadfdt
nand write ${fdtaddr} u-boot-spl-os
</code>
Load the kernel image zImage to NAND. Note that we use the actual size of the zImage file in Hex. If your file has a different size then update this number
<code>
run loadimage
nand write ${loadaddr} kernel
</code>

4) Boot farther to OS

5) Prepare a UBIFS partition

For more information visit: [[http://processors.wiki.ti.com/index.php/UBIFS_Support]]

Preparing NAND partition for modules with 256MB
<code>
ubiformat /dev/mtd9 -s 2048 -O 2048
ubiattach /dev/ubi_ctrl -m 9 -O 2048
ubimkvol /dev/ubi0 -s 230MiB -N rootfs
mount -t ubifs ubi0:rootfs /mnt
</code>

Preparing NAND partition for modules with 512MB
<code>
ubiformat /dev/mtd9 -s 2048 -O 2048
ubiattach /dev/ubi_ctrl -m 9 -O 2048
ubimkvol /dev/ubi0 -s 450MiB -N rootfs
mount -t ubifs ubi0:rootfs /mnt
</code>

6) Install the file system to the UBIFS-partiotion

<code>
cd /mnt
tar xf <path to image>/debian-7.5-bare-armhf-2014-07-07.tar
sync
</code>

7) Enable the Serial login

Edit the file /mnt/etc/inittab as described for the SD card installation.

8) Enable Network

Edit the file /mnt/etc/network/interfaces as described for the SD card installation.

9) Remove the SD card and reboot the board
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