These are the section names used with DebugLib.

Init - Module initialisation
SWI - SWI entry and exit
Service - Issuing and receiving service calls
Log - Log messages
IRQ - IRQ entry and exit
IRQStats - Timing etc. in IRQ handler
TX - Timing etc. in TX handler
Misc - Claiming/releasing frame types
Timer - Watchdog timer
BSD - Debug from BSD code in if_em.c
HW - Debug from generic HW code in if_em_hw.c

Note that errors are always output.
