qmk_firmware/keyboards/clueboard/2x1800/2018/rules.mk

# MCU name
MCU = at90usb1286

# Bootloader selection
#   Teensy       halfkay
#   Pro Micro    caterina
#   Atmel DFU    atmel-dfu
#   LUFA DFU     lufa-dfu
#   QMK DFU      qmk-dfu
#   ATmega32A    bootloadHID
#   ATmega328P   USBasp
BOOTLOADER = halfkay
Cleanup rules.mk for USB64 and USB128 keyboards (#6769) 2019-09-19 16:55:03 +00:00			`# MCU name`
Clueboard Double 1800 support (#2655) 2018-04-01 19:12:45 +00:00			`MCU = at90usb1286`

Cleanup rules.mk for USB64 and USB128 keyboards (#6769) 2019-09-19 16:55:03 +00:00			`# Bootloader selection`
			`# Teensy halfkay`
			`# Pro Micro caterina`
			`# Atmel DFU atmel-dfu`
			`# LUFA DFU lufa-dfu`
			`# QMK DFU qmk-dfu`
			`# ATmega32A bootloadHID`
			`# ATmega328P USBasp`
			`BOOTLOADER = halfkay`