STM32 Built-in Bootloader

[TPrio.1]

Hello everyone,

I am working on an application about updating stm32f103 via built-in bootloader - uart.

I have a bin file that is validated with cheksum equal to st-link utility tool. (sum all the bytes).

My issue is that sometimes with the same bin file the mcu doesnt work properly. I have read flash memory (via st-link utility tool) and i observed that some addresses are corrupted compared to original bin file.

Why happen this? I try to change baud rates but this issue appear again.

My bootloader version is 2.2

I appreciate if someone could help me on that.

[Tesla DeLorean]

>>Why happen this? I try to change baud rates but this issue appear again.

Well the flash integrity/performance is dependent on the power supply. Could be an issue there if the erase/write currents exceed expectations.

Use checksum methods with better integrity, something like a CRC or hashing function (MD5, SHA, ..), sign the binary out of the linker, have the firmware confirm or output an error messages, or flag failure in some way.

[TPrio.1]

thanks for your answer.

I will measure the power supply but i dont think that i have some issue in there.

[TPrio.1]

Tomorrow i am going to use crc-16 to be sure that the file is not corrupted

[Tesla DeLorean]

The thing shouldn't spontaneously corrupt, do you see this only in your board, or more generally available ones?

Any flash writing code within your application? EEPROM Emulation?

[TPrio.1]

Aaa yeah, i am using one flash memory page in linker in order to save some configuration values. Maybe this can cause an issue?

[Tesla DeLorean]

Yes, quite easily.

As the F1 has uniform size sectors, shrink the size visible to the linker, and place this data at the way far end of the memory arena.

[TPrio.1]

I am using the last page of the flash memory to store data, but i have the option to use an external memory instead of the internal's mcu. What is your suggestion about? Do you believe that if i restore the flash memory into intial state (just only for application code) then the bootloader will work properly?

[TPrio.1]

you make my day! The file has been downloaded correctly after restoring the linker script into the initial value.

But i observe that the program stop executing properly after go command, i have to reset it from the power supply not only the reset button. Could you please give me some help on this?