CrossRoads:
This came up in another thread as well - do you know how to download a sketch via the ICSP pins using the IDE?
Adding entries to boards.txt similar to below works for me (I have others that are just different clock freqs). Your programmer may vary 
uno16.name=Arduino Uno ICSP @ 16MHz
uno16.upload.using=arduino:usbtinyisp
uno16.upload.protocol=stk500
uno16.upload.maximum_size=32256
uno16.upload.speed=115200
uno16.bootloader.low_fuses=0xff
uno16.bootloader.high_fuses=0xde
uno16.bootloader.extended_fuses=0x05
uno16.bootloader.path=optiboot
uno16.bootloader.file=optiboot_atmega328.hex
uno16.bootloader.unlock_bits=0x3F
uno16.bootloader.lock_bits=0x0F
uno16.build.mcu=atmega328p
uno16.build.f_cpu=16000000L
uno16.build.core=arduino