STM32 Tutorial #39 – Cleaner Jump to System Bootloader

In this video we revisit how to jump to the built-in system bootloader without using the boot0 pin. The earlier video was a bit naughty as it uses the stack space to store a flag during restart (stack space is NOT initialised during a reset). In this video we do it more elegantly.

This video is leading up to a future video implementing a custom bootloader from scratch as well as a relocated application.

The method in this video is BUGGY – please watch https://www.youtube.com/watch?v=Wm7eWu5dCrY for an explanation!

The earlier video is here: https://www.youtube.com/watch?v=qXi6o8hhwUE

This approach is documented on the STM32World wiki here: https://stm32world.com/wiki/STM32_Jump_to_System_Memory_Bootloader

Project Files: https://github.com/STM32World/stm32fun

#stm32 #tutorial #bootloader #stm32world

00:00 Intro and recap
01:40 Analysing the code
03:14 The Linker script
04:38 Tweaking the linker script – moving the stack
06:22 Using our new bootloader flag
07:44 Testing our new approach