Uploaded December 2025 | Updated September 2026, 2 weeks ago
Build a *reliable STM32 bootloader* that validates the application before jumping to it, using a magic number and reset handler check to make sure valid firmware is present.
In this tutorial, we continue the STM32 custom bootloader series and add *application validation* to the bootloader. We create a dedicated application header, place it at a fixed Flash address using the linker script, and store a magic number that the bootloader can check before executing the application.
The bootloader reads the application header, verifies the magic number, checks that the application's reset handler points to a valid Flash address, and only then transfers control to the application. We also explain why the application should be flashed using an ELF or HEX file so that the header and application sections are placed at their correct Flash addresses.
#STM32 #STM32Bootloader #EmbeddedSystems #Bootloader
📁 *Download Project Files & Full Article:* controllerstech.com/stm32-bootloader-application-validation
📁 *STM32 Tutorials:* controllerstech.com/stm32-tutorials
📁 *ControllersTech Home:* controllerstech.com
### ▶︎ Related Videos
1️⃣ *STM32 Custom Bootloader – Part 1:* youtu.be/fRrAiKU7FzU
2️⃣ *CRC Based Application Validation:* youtu.be/8-HSYugyeA8
3️⃣ *STM32 Custom Bootloader Playlist:* youtube.com/playlist?list=PLfIJKC1ud8ghl0i_TIhAOmo4-7KXCMw63
🔔 *Subscribe for more STM32 and embedded systems tutorials!*
👍 Like and share if this tutorial helped you.
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Build a *reliable STM32 bootloader* that validates the application before jumping to it, using a magic number and reset handler check to make sure valid firmware is present.
In this tutorial, we continue the STM32 custom bootloader series and add *application validation* to the bootloader. We create a dedicated application header, place it at a fixed Flash address using the linker script, and store a magic number that the bootloader can check before executing the application.
The bootloader reads the application header, verifies the magic number, checks that the application's reset handler points to a valid Flash address, and only then transfers control to the application. We also explain why the application should be flashed using an ELF or HEX file so that the header and application sections are placed at their correct Flash addresses.
#STM32 #STM32Bootloader #EmbeddedSystems #Bootloader
📁 *Download Project Files & Full Article:* controllerstech.com/stm32-bootloader-application-validation
📁 *STM32 Tutorials:* controllerstech.com/stm32-tutorials
📁 *ControllersTech Home:* controllerstech.com
### ▶︎ Related Videos
1️⃣ *STM32 Custom Bootloader – Part 1:* youtu.be/fRrAiKU7FzU
2️⃣ *CRC Based Application Validation:* youtu.be/8-HSYugyeA8
3️⃣ *STM32 Custom Bootloader Playlist:* youtube.com/playlist?list=PLfIJKC1ud8ghl0i_TIhAOmo4-7KXCMw63
🔔 *Subscribe for more STM32 and embedded systems tutorials!*
👍 Like and share if this tutorial helped you.
******** SUPPORT US ********
🎁 Donate on Paypal: paypal.me/controllertech
🏆 Become a Member on Patreon: patreon.com/controllerstech/join
🎓 Join Youtube Membership: youtube.com/channel/UCkdqtSMnhYuMsJkyHOxiPZQ/join
🌐 *Connect:*
Facebook: facebook.com/controllerstech
Telegram: https://t.me/controllerstechdiscuss
Instagram: instagram.com/controllerstech
Website: controllerstech.com
