Page "GNU Debugger" Paragraph 17
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The same mode is also used by KGDB for debugging a running Linux kernel on the source level with gdb.
With KGDB, kernel developers can debug a kernel in much the same way as they debug application programs.
It makes it possible to place breakpoints in kernel code, step through the code and observe variables.
On architectures where hardware debugging registers are available, watchpoints can be set which trigger breakpoints when specified memory addresses are executed or accessed.
KGDB requires an additional machine which is connected to the machine to be debugged using a serial cable or ethernet.
On FreeBSD, it is also possible to debug using Firewire direct memory access ( DMA ).
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