FreeBSD Developers' Handbook
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# 10.6 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, including a serial console.

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