> What do you mean by serial output? Seeing the plug boot and being able to give commands?
Exactly: when connected to the console serial port via the optional JTAG box, there is no output -- only input. I *can* give it commands. If I hit return a few times after applying power, the plug stays in the uboot command area and does not boot into the blinking WiFi LED stage. If I don't hit returns after power on, the plug boots all the way.
After the plug boots, even though I don't get any response from the plug when I type, I know it is doing what I am asking: I can log in by typing the root user name and default root password, and then if I type a 'reboot' command, the plug reboots.
I have a SheevaPlug too, and it works perfectly over the jtag serial console interface. It's only my guruplug that seems to be JTAG output-challenged.
I'm just a newbie in the plugworld, but is JTAG-communication defined by specific pins for in and output? Otherwise I'd say your JTAG is defective. I just was really surprised how deep it's pushed in the plug, the whole connector disappears into the housing so to say...