Hi,
with 8,x an previous, I compile kernel with
        options         KDB
        options         DDB

        options         ALT_BREAK_TO_DEBUGGER

and so hitting control+alt+escape would enter the debugger on the console,
or CR ~ ^b on the serial console.

the same config on 9.1, only if 
        sysctl debug.kdb.break_to_debugger=1
which allows BREAK on the serial, the control+alt+escape works on the console.

from NOTES:
# Options for serial drivers that support consoles:
options         BREAK_TO_DEBUGGER       # A BREAK on a serial console goes to
                                        # ddb, if available.

can someone clarify?

cheers,
        danny


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