Andbot-Auto-Upgrade-OTA

Introduction

The document describes the Andbot auto upgrade OTA architecture and updrade mechanisam

Andbot auto upgrade OTA (A-OTA)

The Andbot auto upgrade OTA (A-OTA) architecture include 3 parts; the Andbot app, colud server, and upgrade system.

The A-OTA architecture and work flow diagram.

Andbot app

The Andbot app is a background service application program. In A-OTA case, it provides functions as the below

• connecting and syncing up database to cloud server
• check system and upgrade information
• download and check upgrade files
• backup Andbot setting files
• system power monitor
• switch System to upgrade system

Andbot app work flow

--TBD--

Cloud Server

The servers provide andbot system upgrade files and andbot database in cloud. the architecture as the below

• internet cloud Server (Amazon EC2)
• system binary image Storage (Amazon S3)
• Andbot database (Amazon DynamoDB)

Upgrade System

When system buring up from the upgrade u-boot, the root file system will change to busybox, we using bash script to do the upgrade process. There are some details and related information as the follows

Major storage partitions(SD card/eMMC)

modify the bootrootfs setting in boot.ini

[Normal] setenv bootrootfs "console=tty1 console=ttySAC2,115200n8 root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait ro" [Upgrade] setenv bootrootfs "console=tty1 console=ttySAC2,115200n8 root=LABEL=upgrade rootwait rw"

Busybox and Linux kernel config

busybox config

Busybox Settings --->
	Build Options --->
			[*] Build Busybox as a static binary

kernel config

File systems  --->  
	DOS/FAT/NT Filesystems  --->
			<*> MSDOS fs support
			<*> VFAT (Windows-95) fs support
			(437) Default codepage for FAT
			(iso8859-1) Default iocharset for FAT
			<M> NTFS file system support
			[ ]   NTFS debugging support
			[*]   NTFS write support
			<*> VFAT (Windows-95) fs support
  
	-*- Native language support  ---> 
			CONFIG_NLS_CODEPAGE_437=y [United States, Canada]

####busybox fstab and rcS files

etc/init.d/rcS

#!/bin/sh
mount -a 
" << upgrating system now... >> "
sync
gzip -dc /warehouse/trusty.img.gz | dd of=/dev/mmcblk0p2 bs=1M
sync
cp /warehouse/BOOT/boot.ini /boot
cp /warehouse/BOOT/exynos5422-odroidxu3.dtb /boot
cp /warehouse/BOOT/uInitrd  /boot
cp /warehouse/BOOT/zImage /boot
sync
reboot

etc/fstab

UUID=6E35-5356								/boot      vfat  defaults 0 0
UUID=88f52e33-8730-4943-81b0-f22292dd417b	/warehouse ext4  defaults 0 0

References

• busybox

  • http://www.busybox.net/

• ODROID-XU3 EVM board

  • http://www.hardkernel.com/main/products/prdt_info.php?g_code=G140448267127