On Thu, Jan 31, 2013 at 07:01:09PM -0500, Jason Cooper wrote:

If you're interested, I still have a few ideas.  One was to wire two USB
serial adapters end to end to create a different console
(console=/dev/ttyUSB0,115200, getty, etc).  Since they would be going
over usb, that's a different clock, so it should work and provide us
with a safety net.

I can't recall, can you still use JTAG once the CPU has hung on a mbus
access?

If so memory dumping the console ring, or cpu registers would get the
answer pretty directly..

My guesses would be the RTC and/or GPIO blocks (the GPIO blinker needs
a clock), based on table 94.

Jason