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This module provides support for remotely debugging GRUB using the GNU
Debugger (GDB) over serial. This is typically done when troubleshooting GRUB
during development and not required for normal GRUB operation. This module adds
support for commands required by the GDB remote debug function including
gdbstub to start GDB stub on given serial port,
gdbstub_break to break into GDB, gdbstub_stop to stop the
GDB stub.