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TMDS64EVM: Flashing of sbl_null bootloader fails

Part Number: TMDS64EVM
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

Hi,
I am using the python script uart_uniflash.py to load the sbl_null bootloader into flash. Since after the upload of the sbl_uart_uniflash.release.hs_fs.tiimage, the progress bar stops, I have set a loop_forever function into the main.c of sbl_uart_uniflash example code.

Stepping through the code I found out, that it stays in the while-loop here

:

This is the called function inside Bootloader_socWaitForFWBoot() in main.c

How can this happen? 
This thread shows the same problem, but no solution: TMDS64EVM: How to load and debug SBL - Processors forum - Processors - TI E2E support forums

Regards,
Jakob