sudar/Arduino-Makefile — pull request #166 by sej7278 (2014-02-08 01:50:35+00:00)
Title: added "gpio" to the list of isp's that don't have a port

the gpio programmer type is used on the raspberry pi to upload using the gpio spi pins via a sysfs interface, with a modified avrdude. its sort of kind of maybe a hardware isp, but doesn't have a device file like serial/usb.

partially fixes issue #165