Problem with STM32CubeProgrammer v2.20.0 External Loader

[steven_falco]

I've written an external loader for a flash memory chip.  I'm able to program the flash chip using my external loader with STM32CubeProgrammer v2.19.0, but when I try to use my external loader with v2.20.0 it doesn't work.

I've attached logs from both a good run with v2.19.0 and a bad run with v2.20.0.  I don't know how to debug this, because I naturally don't have access to the source code of the STM32CubeProgrammer CLI tool.

Have there been any changes to the requirements of an external loader as of v2.20.0?

Alternatively, can I somehow downgrade the STM32CubeProgrammer version that STM32CubeIDE uses?

I'd really like to use the most current tools, but right now I'm stuck...

[Maryem]

Hello,

The issue has already been submitted to the concerned team.

Internal ticket number: 214053 (This is an internal tracking number and is not accessible or usable by customers).

Maryem.

[Tesla DeLorean]

The failing one is getting the loader pulled in at 0x20004004, and the prior one 0x20000004

Failing during a call the Init(), timeout, suggesting it's locked up inside. Suggest implementing UART output early so you can get diagnostic / telemetry out.

Check you build address in Linker Script, check if you're using a Vector Table / Interrupts, because that's a table with fixed/absolute addresses.

Ideally want to build something without need for interrupts. Something small, and self-relative.