Deepak,
Thanks. I like this list for it's good responses. Could you please elaborate on "POST card", what is it exactly ? You are correct, I do not have a simulator.
It is a PCI card which displays the value of port address 80. In LinuxBIOS source, it is not hard to find, eg.
intel_chip_post_macro(0x11)
It will dump 0x11 to port 80, and POST card will display 11 on its LED.
While debugging, you can record the value and search thru the source to see where LinuxBIOS hangs. However, you can't do backtracing with this device.
-Andrew