Software Update (OTA) for Zephyr

Zephyr devices can be connected in two possible (direct and in-direct) ways to the internet. Directly using Modem/WiFi/Ethernet medium or in-directly via local radio through Gateways like Linux. Upgrading such Zephyr system in the field is a complex task and must be robust, secure.

This talk will details various possible update solutions available like UpdateHub, Hawkbit, SWUpdate for Zephyr. Using a NXP FRDM-K64F board as an example, we will discuss and demo different possible ways for updating Zephyr system.

Agenda

• McuBoot
• Updatehub
• mcumgr
• ZUpdate
• ZUpdate -Hawkbit
• Future work

Linux vs Zephyra

• on linux it handles both download and install

• for zephyr this is split into two

  • download handled by application
  • install is handled by MCUBoot

• First we focus on download.

• Then we look at install

MCUBoot

• Bootloader for Zephyr and mynewt
• integrity and security check
• multi image boot support
• softwre update heavy lifting

MCUBoot Memory Layout

• NXP Freedom kit

chosen {
zephyr,code-partition = &slot0_partition;
};
&flash0 {
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
boot_partition: partition@0 {
label = "mcuboot";
reg = <0x00000000 0x00010000>;
read-only;
};
slot0_partition: partition@20000 {
label = "image-0";
reg = <0x00020000 0x00060000>;
};
slot1_partition: partition@80000 {
label = "image-1";
reg = <0x00080000 0x00060000>;
};
scratch_partition: partition@e0000 {
label = "image-scratch";
reg = <0x000e0000 0x00020000>;
};
};
};

Paritions

• Mcuboot
• slot0
• slot1
• scratch

MCUBoot operation

• conditions: Interrupt swap, request swap, valid image
• Video from Youtube

MCUBoot swap

• swap status
  • three stage operation
  • slot1 to slot0

API

• image confirmed
• write image
• request upgrade
• erase

Live share

west flash -d ./frdm_mcuboot/

Software Update

Updatehub

• What is it?
• Polling Mode
• Manual mode
• Community vs Enterprise

Live Share

~/work/west/native/zephyr/samples/net/updatehub
west flash

~/work/west/native/zephyr/samples/net/updatehub
west flash -bin-file ./build/zephyr/zephyr-signed.bin

Web UI

• Overview
• Devices
• Pakcages
• Rollouts

Each rollout has

• UID, version, hardware

MCUmgr

• Management library for Zephyr and mynewt
• OS and hwardware agnostic

Layered modular design

• 1: img_mgmt,fs_mgmt,log_mgmt,os_mgmt
• 2: mgmt
• 3: SMP
• 4: BLuetooth, Shell, UDP

Reference Screenshots

• STM32 target initial slot list
• Uploading the OTA image via the Bluetooth interface
• STM32 target initial slot list after OTA push

ZUpdate architecture

• Configuration Manager
• ZUpdate Core
• Download Handler
  • Hawkbit
  • updatehub
  • SWUpdate
  • Custom
• StorageHandler
  • SPI NOR
  • FLash
  • MMC
• Low-Level Comm
  • BLE
  • WiFI
  • LoRa