[asti]

So after spending some time on and off on this, and eliminating all possible sources of calling initialise_monitor_handles and the like, I finally tracked down the problem to crt0.S in the toolchain.

Looks like the version that was shipped has a bkpt 0xab instruction baked in. So no matter what I did, it would always trigger semi-hosting. I replaced lib\thumb\cortex_m0\crt0.o with a version from a newer arm-eabi-gcc, and the problem has now gone away.

Thank you for your guidance and clues.

• This reply was modified 5 years ago by asti.

[asti]

Thank you for your support.

Expected behavior:

Application runs without debugger.

Current behavior:

No build errors or warning.

Application crashes without debugger attached.

Specifically, application crashes without semi-hosting console support enabled.

 

What’s happening, I think, is that newlib being used here still links with semi-hosting calls.

I think, irrespective of me specifying nosys, it’s using rdimon. (Please see attached)

libc is supposed to use RTT.

Could I have missed something?

 

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[asti]

Hello,

Thank you for the suggestion.

I had already tried ‘–specs=nosys.specs’ in vcxproj link options.

I had also converted this to a standalone project and specified nosys in LDFLAGS. (picture attached)

Both require semihosting. Still no luck, I’m afraid. NRF51 sdk only links properly on GCC 4.9, so I can’t upgrade to get the newer options.

Is there anything else I could try?

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[asti]

Thank you!

[Author]

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