Setup Debugging in AmigaOS 4.1 Classic
1) Modify your Sys:Kickstart/kicklayout-xxxx file (where xxxx is your model number). Change the kernel to kernel.debug. Save the file.
2) Modify your startup sequence so the C:Bootloader line reads:
C:Bootloader COMMANDLINE=”SERIAL DEBUGLEVEL=5 BAUDRATE=57600″
Save the file.
3) Power off your Amiga.
4) Connect a serial cable to your Amiga’s serial port, and connect the other end to another computer with a serial port.
5) Start the second computer where the cable is attached and start a Terminal program. Set it to a Baud Rate of 57600 8-N-1. Set that Terminal Program to capture the buffer to a file.
6) Turn on your Amiga. After the Kickstart loads and the machine resets, you should start to see serial output on the second computer. Save this output.
I found the answer here if anyone is interested:
https://wiki.amigaos.net/wiki/Debug_Kernel
debuglevel [N]
Sets the debuglevel to level N.
The debug level is the amount of information that should be output by the debug kernel.
Debug levels range between 0 to 20 with 0 being no debug, 5 moderate output (all warnings are 5 or lower), 10 being lots of output, and 15 being an insane amount of output (fault conditions from kernel functions are displayed), and 20 being a ludicrous amount of output (entry and exit to functions will be logged).
Note: higher levels are possible, but will produce too much output to be useful.