Current KGDB Quick Start Guide is for 2.4 version.

Quick Start Guide For KGDB :   kgdbquickstart-2.4.pdf.

KGDB documentation prior to 2.3 version :   kgdb_full_2.2.pdf.bz2.
KGDB documentation for 2.3 and 2.4 version :   kgdb_docu_full-2.4.pdf.bz2.
This documentation provides information about requirements,preparing and modules debugging for KGDB.