Hello, I am using stm32f103 in my project. Software as GPIO_PinRemapConfig (GPIO_Remap_SWJ_JTAGDisable, ENABLE); I disabled it with the command. But now I can activate it back, I don't know how.

Forum|Forum|6 years ago
July 17, 2020
8 replies
1174 views

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Tesla DeLorean

Guru

With BOOT0=HIGH your code will no longer run at reset, and you can recover/erase the device in that mode

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DeveloperManAuthor

Associate III

So I can access jtag pins by interfering with this situation with hardware boot pin? Is that so?

Tesla DeLorean

Guru

Correct

You can protect the content of the flash from extraction with RDP/ROP (Read Out Protection) settings.

If you use an STM32 design that isn't 12+ years old you can also blow a fuse that disables the interface permanently. But you should think about how to use that, and how to update from within, before you brick the device and need ComponentSolderingDude to replace the IC

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DeveloperManAuthor

Associate III

So I can access jtag pins by interfering with this situation with hardware boot pin? Is that so?

Tesla DeLorean

Guru

Yes, think of threat surface as a sphere, where the radius is the disparity in wits, and where the radius can increase over time

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TDK

Yes. Hold BOOT0 high during reset and access the chip with JTAG or SWD.

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DeveloperManAuthor

Associate III

Thanks for your interest.

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