OK, this is gonna hurt because I think I already know the answer. . .
When using JTAG on an ATMEGA2560, if you program all of Port-F (JTAG port) pins to all inputs, does it brick your programming interface? I am getting a "No JTAG devices detected" error. Is there any way to recover, or am I just hosed? Flame suit on; let me have it. . .