I have a AVR-USB-JTAG and an STK500 + STK501 with a ATMega128L installed. I am able to program, erase, read, etc. via the JTAG, but I cannot successfully enter debugging mode. I select the platform and device, and it says the JTAG ICE was not detected… if I hit “start debugging”, it says “could not connect to JTAG ICE”. I have the virtual COM port as port 1, 115200 baud, AVR 4.12 RC1 build 452. The JTAG enable fuse is also checked.
What is weird is that when I first got this, it would enter debug mode successfully. I don’t understand what could be going wrong or what has changed.