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FreeBSD Handbook : Kernel Debugging : Debugging a Console Driver
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22.5. Debugging a Console Driver

Since you need a console driver to run DDB on, things are more complicated if the console driver itself is failing. You might remember the use of a serial console (either with modified boot blocks, or by specifying -h at the Boot: prompt), and hook up a standard terminal onto your first serial port. DDB works on any configured console driver, of course also on a serial console.


FreeBSD Handbook : Kernel Debugging : Debugging a Console Driver
Previous: On-line Kernel Debugging Using Remote GDB
Next: Linux Emulation
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Updated March 2, 1999