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I use J-Link GDB session to debug assembly code for LPC2148 device. I set a hwbreak at some address in flash. I receive 'SIGTRAP, Trace/breakpoint trap. PC in ?? ()'

I use SEGGER J-Link GDB session to debug assembly code for NXP LPC2148 device. I set a hwbreak at some address in flash. I receive 'SIGTRAP, Trace/breakpoint trap. PC in ?? ()' If I want to step through the code I get 'Cannot find bounds of current function'. Why PC is ??

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