Embedded SW Booting

Boot Manager for controlling jumping to Bootloader or App/Bootloader Updater based on shared flags and some integrity checks
BootLoader for communicating with BCM to get App with both capabilities ( Normal Update _/ Delta Update )
BootLoader Updater ( Silent _/ Communicative ) for updating BootLoader
Application

Design

Memory Design

Memory Constraints

Boot manager Maximum Size must be <= 12.5% of the total flash size
BootLoader Maximum Size must be <= 18.75% of the total flash size
Application or Bootloader Updater Maximum Size must be <= 68.75% of the total flash size (they share the same memory area)

CI Pipeline with Jenkins

Releases

V_2.0.1 Design Flow and next Releases

V_1.0.0 Design Flow

Delta Update Feature

The Goal

The goal is to reduce the number of bytes that are being delivered to:

Reduce the download time – The new software needs to quickly get to the car’s gateway (e.g., head-unit) in order to start the update process
Decrease the amount of needed memory – After the new version is delivered, there needs to be room to store it before the update is started
Decrease the transport time between the gateway and the target ECU – In case of ECU update, the new version needs to go through the CAN/Ethernet bus, which is limited in bandwidth
Reduce the update time – The update time depends in some cases on the amount of changes that exist in the new version

Delta Update vs Full Image Update

Algorithm

The used algorithm is JojoDiff, you can find more info about it here

How to generate Patch File by WSL

To generate patch files you'll need to build JojoDiff or JDiff.js.

Install a recent version of Node.js.
Install JDiff.js:
```
>> npm install jdiff-js -g
```

Generate a patch file via:

>> jdiff old_SW.bin new_SW.bin old_to_new_SW.patch

USED TOOLS

SW TOOLS

STM32 CubeIDE 1.11.0
STM32 St-Link Utility
Ubuntu WSL
Python 3.10.8
Cppcheck
Jenkins

HW TOOLS

STM32F439zi (Nucleo-144)
USB To TTL Module
Micro SD Card Adapter Module
Micro SDHC 8 GB

Connection

Between Microcontroller and "USB To TTL Module" (UART Connection)

Tx of Module connected to RX of Microcontroller( pin PC11 )
Rx of Module connected to TX of Microcontroller( pin PA0 )
Common Ground

Between Microcontroller and "Micro SD Card Adapter Module" (SPI Connection)

( pin PA5 ) : SPI SCK
( pin PA6 ) : SPI MISO
( pin PB5 ) : SPI MOSI
( pin PC0 ) : SPI CS
VCC
Common Ground

How to Try

Flash the boot manager manually (just for first time) using STM32 St-Link Utility
Flash bootloader manually (just for first time) using STM32 St-Link Utility
Run BCM python Script by

>> cd BCM
>> python.exe BCM.py

abdelrahman99999/Booting