I'm trying to bring up a new board of mine based on an ATMega6450. I'm running AS6.2 on Win7 x64 with Atmel-ICE (current firmware). A week ago I was able to write to flash and read and set fuses via this setup and the JTAG interface. Went out of town, came back, and now bupkis. I can't even read the target voltage. The green LED on the pod is lit, the board voltage reads 5.1V on a meter, I can program another board (ATTiny85) with the same pod using debugWire. Using SPI via the micro squid cable I can read the target voltage, but trying anything else throws the error. Full text is: "Failed to enter programming mode. ispEnterProgMode: Error status received: Got 0xc0, expected 0x00 (Command has failed to execute on the tool)." ISP clock is set to 8 kHz (system clock is 32.768 kHz; I know, it's crazy slow and I'm trying to switch to the internal oscillator if I can get to the fuses).
Thanks for any thoughts.