I'm trying to run an app from NOR flash, which makes conventional debugging means difficult.

The program seems to get hung up when I try to specify a reset of the PLLA clock:


... but it's okay when I attempt to reset the main clock:


... as judged by telling an LED to flash whenever the board is running.

It's the only thing that changes between the two code bases. I imagine that changing the PLLA clock is, in some sense, telling it to change the clock it's running on while it's running. Can someone refer me to a way to change a clock in midstream? I'd like to make sure I'm taking care of all the things I need to in order to make sure that I haven't left something out.

Thanks for any help you can provide.

If it helps, you might be interested to know that the code runs just fine from SDRAM but "hangs" when booting from NOR flash. Unfortunately, I can't use the JTAG debugger when I'm booting from NOR flash; I'd appreciate any help that anyone might be able to offer.