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ROM Bootloader doesn't run when Flash is blank

Other Parts Discussed in Thread: TM4C1294NCPDT

Previously I was developing using the EK_TM4C1294XL and was able to jump from my program to the Bootloader in ROM. I was also able to clear the flash and the bootloader would run automatically.

Recently I switched to my own prototype boards with the TM4C1294NCPDT but the ROM based bootloader does not run automatically if flash is cleared. I can branch from my own program to the bootloader successfully.

Is it possible that it doesn't work on some of the die revisions?

Thanks, Isaac