Dual booting android and Ubuntu on ODROID-XU4

I made dual booting image for ODROID-C2.
https://codewalkerster.blogspot.kr/2016/03/dual-booting-android-and-ubuntu-on.html

We will make dual booting image for ODROID-XU3/4.

It is recommended to use a storage device of 16Gbyte or more.

Make bootable android media(eMMC or SD).

https://wiki.odroid.com/odroid-xu4/os_images/android/v5.4

Add "VFAT" to label of fat32 partition.

Download ODROID-XU3/4 Ubuntu Image.

https://wiki.odroid.com/odroid-xu4/os_images/linux/ubuntu_4.9/20170824

Copy rootfs and boot partition of ODROID-XU3/4 Ubuntu to your desktop Ubuntu.

mount disk wrote ODROID-XU3/4 Ubuntu image on your desktop PC.

$ mount

...

/.../ubuntu-16.04.3-4.9-mate* on /media/codewalker/boot type vfat (ro,nosuid,nodev,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks2)

/.../ubuntu-16.04.3-4.9-mate* on /media/codewalker/rootfs type ext4 (ro,nosuid,nodev,uhelper=udisks2)

$ mkdir dual
$ cd dual

$ mkdir boot
$ sudo cp -a /media/username/boot/* boot/
$ mkdir rootfs
$ sudo cp -a /media/username/rootfs/* rootfs/

Unmount ubuntu disk image.

Delete rootfs/aafirstboot

$ rm -rf rootfs/aafirstboot

Edit rootfs/etc/fstab

$ sudo vi rootfs/etc/fstab

LABEL=VFAT /media/boot vfat defaults,rw,owner,flush,umask=000 0 0

Chagne userdata partition UUID.

- Insert disk wrote android image on your desktop PC and unmount /dev/sdX3.

$ sudo umount /dev/sdX3

$ cat rootfs/etc/fstab 
LABEL=VFAT /media/boot vfat defaults,rw,owner,flush,umask=000 0 0

UUID=e139ce78-9841-40fe-8823-96a304a09859 / ext4 errors=remount-ro,noatime 0 1

$ sudo tune2fs /dev/sdX3 -U e139ce78-9841-40fe-8823-96a304a09859

Copy ODROID-XU3/4 Ubuntu files to android disk.

$ mv /media/username/VFAT/boot. ini  /media/username/VFAT/boot. ini.android

$ cp boot/* /media/username/VFAT/

$ sudo cp rootfs/* /media/username/e139ce78-9841-40fe-8823-96a304a09859/ -a

$ sync

Make script to change OS.

in Ubuntu

$ vi boot_android.sh

------------------------------------------------------------------------

#!/bin/bash

sudo mv /media/boot/boot.ini /media/boot/boot.ini.ubuntu

sudo mv /media/boot/boot.ini.android /media/boot/boot.ini

sudo reboot
------------------------------------------------------------------------
#chmod +x boot_android.sh

in Adnroid

$ su

# mount -o rw,remount /

# vi /system/bin/boot_ubuntu.sh
------------------------------------------------------------------------

#!/bin/sh

mv /storage/internal/boot.ini /storage/internal/boot.ini.android

mv /storage/internal/boot.ini.ubuntu /storage/internal/boot.ini

reboot

------------------------------------------------------------------------
# chmod 777 /system/bin/boot_ubuntu.sh

How to change DDR Clock on ODROID-C2(android)

Official wiki page
http://odroid.com/dokuwiki/doku.php?id=en:c2_adjust_ddrclk

Guide to change DDR Clock by android update and recovery.

Open https://dn.odroid.com/S905/BootLoader/ODROID-C2/

Download files.

updatepackage-odroidc2-ddr-408.zip

updatepackage-odroidc2-ddr-792.zip

updatepackage-odroidc2-ddr-912.zip

updatepackage-odroidc2-ddr-1104.zip

Open Utility app.

Select "Package install from storage"

Select "File Manager" -> Download folder

Select updatepackage-odroidc2-ddr-xxx.zip wanted DDR clock.

Recovery!

After reboot, you can check the DDR configuration using the following logs of boot loader if you have a usb-uart module kit.

BL2 Built : 11:44:26, Nov 25 2015.
gxb gfb13a3b-c2 - jcao@wonton

Board ID = 8
set vcck to 1100 mv
set vddee to 1070 mv
CPU clk: 1536MHz
DDR channel setting: DDR0 Rank0+1 same
DDR0: 2048MB(auto) @ 1104MHz(2T)-14