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The debugger cannot reconnect without a hard reset of the Cortex-M55.

N_MIYA

Hi.


We are now implementing and testing CM55 in our FPGA.
For a very simple configuration, we use the startup code for the Generic Cortex-M55 device as is.

After the hard reset has been asserted, uVision allows you to load and debug (step-by-step) the program on the first connection.

However, if you exit debugging and try to load and debug the program again with a warm reset by sysresetreq, you will get a "Core cannot be stopped" error message that prevents the connection.

After reviewing the debugger logs,
After writing 0xA05F0003 (indicating debug key and enable) to DHCSR(0xE000EDF0), I notice that the values read are different.
First      : 0x00130003
Second : 0x00110003

The second time the S_HALT bit is not set and appears to fail.

Do you have any clues to resolve this symptom?

Best regards.