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--- en:c1_ubuntu_minimal [2015/08/10 00:41]
mdrjr
+++ en:c1_ubuntu_minimal [2016/11/04 03:02]
mdrjr
@@ Line 1: / Line 1: @@
+Changelog:
+20150121:
+  - Initial version
+20150131:
+  - Added the missing automount of /media/boot
+  - Fixed the date (image was 20140121)
+  - Added optional step to allow root login via ssh (included on the image)
+20161102:
+  - Updated to Ubuntu 16.04
+----
+To this you'll need:
+      * PC running Linux Ubuntu 16.04 64 Bits
+      * MicroSD or eMMC to write the new image
+This guide will cover the process to recreate the official Ubuntu Minimal image.
+Tested and written on a Ubuntu 16.04 64Bits x86 Machine.
+  - Tools: \\ Basic set of tools that we will need to create our image. <code>
+sudo apt-get install debootstrap qemu-user-static</code>
+  - Work folder\\ Create a workspace<code>
+mkdir ~/ubuntu
+cd ubuntu
+export ubuntu=`pwd`</code>
+  - Empty image (4GB) \\ Create a image with 4096 1Mbyte blocks (4Gbyte image) <code>
+dd if=/dev/zero of=./image.img bs=1M count=4096
+</code>
+  - Image partitioning \\ Create the two needed partitions, one fat32 for kernel+initramfs+boot script and another ext4 for the OS <code>
+fdisk image.img
+n
+p
+<return>
++128M
+t
+c
+n
+p
+<return>
+<return>
+w
+</code>
+  - Formatting and setting up partitions \\ Setup loopback and format the partitions. \\ Also change the UUID and disable journaling. <code>
+sudo losetup /dev/loop0 ./image.img
+sudo partprobe /dev/loop0
+sudo mkfs.vfat -n boot /dev/loop0p1
+sudo mkfs.ext4 -L rootfs /dev/loop0p2
+sudo tune2fs /dev/loop0p2 -U e139ce78-9841-40fe-8823-96a304a09859
+sudo tune2fs -O ^has_journal /dev/loop0p2
+</code>
+  - Bootloaders \\ Download a pre-built version of U-Boot for C1 and fuse to our image. <code>
+wget https://raw.githubusercontent.com/mdrjr/c1_uboot_binaries/master/bl1.bin.hardkernel
+wget https://raw.githubusercontent.com/mdrjr/c1_uboot_binaries/master/u-boot.bin
+wget https://raw.githubusercontent.com/mdrjr/c1_uboot_binaries/master/sd_fusing.sh
+chmod +x sd_fusing.sh
+sudo ./sd_fusing.sh /dev/loop0
+</code>
+  - Deboostrap \\ Mount the partitions, copy qemu to enable chroot to arm and start debootstrap <code>
+mkdir -p target
+sudo mount /dev/loop0p2 target
+sudo mkdir -p target/media/boot
+sudo mount /dev/loop0p1 target/media/boot
+sudo mkdir -p target/usr/bin
+sudo cp /usr/bin/qemu-arm-static target/usr/bin
+sudo debootstrap --variant=buildd --arch armhf xenial target http://ports.ubuntu.com
+</code>
+  - Preparations via chroot \\ Will add hardkernel keys and repositories, fix ubuntu respository list and install the basic set of tools for a minimal image <code>
+sudo chroot target
+cat << EOF > /etc/apt/sources.list
+deb http://ports.ubuntu.com/ubuntu-ports/ xenial main universe restricted
+deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial main universe restricted
+deb http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main universe restricted
+deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main universe restricted
+deb http://ports.ubuntu.com/ubuntu-ports/ xenial-backports main restricted
+deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-backports main restricted
+deb http://ports.ubuntu.com/ubuntu-ports/ xenial-security main restricted
+deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-security main restricted
+deb http://ports.ubuntu.com/ubuntu-ports/ xenial-security universe
+deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-security universe
+deb http://ports.ubuntu.com/ubuntu-ports/ xenial-security multiverse
+deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-security multiverse
+EOF
+apt-get update
+apt-get install software-properties-common u-boot-tools isc-dhcp-client ubuntu-minimal ssh
+apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D986B59D
+echo "deb http://deb.odroid.in/c1/ xenial main" > /etc/apt/sources.list.d/odroid.list
+apt-get update
+apt-get install linux-image-c1 bootini
+</code>At this point.. You'll have several errors, That's fine. \\ You can ignore it right now.<code>
+cp /boot/uImage* /media/boot/uImage
+</code>
+  - Setup ethernet as DHCP and create the loopback interface <code>
+cat << EOF > /etc/network/interfaces.d/lo
+auto lo
+iface lo inet loopback
+EOF
+cat << EOF > /etc/network/interfaces.d/eth0
+auto eth0
+iface eth0 inet dhcp
+EOF
+</code>
+  - Setup fstab <code>echo "LABEL=boot /media/boot vfat defaults 0 0" >> /etc/fstab
+echo "UUID=e139ce78-9841-40fe-8823-96a304a09859 / ext4 errors=remount-ro,noatime 0 1" >> /etc/fstab</code>
+  - Setting a root password <code>
+passwd root
+</code>
+  - (Optional) Allow root login via ssh <code>sed -i s/"PermitRootLogin without-password"/"PermitRootLogin yes"/g /etc/ssh/sshd_config</code>
+  - Clean ups and preparation to test the image. <code>exit
+sudo umount target/media/boot
+sudo umount target
+sudo sync
+sudo losetup -d /dev/loop0
+</code>
+  - Flashing your image <code>
+dd if=image.img of=/dev/sdX bs=1M
+</code>
+  - After your first boot, install the u-boot package to get updates. <code>sudo apt-get install u-boot</code>