On Tue, 26 Aug 2008, Scott Wood wrote:
On Tue, Aug 26, 2008 at 01:00:05PM +0100, Chris Skepper wrote:
I'm triggering an LED which is connected to port A. Are you saying that
wouldn't work once the caching is enabled?
It's quite possible. What other registers are in the same cache line as
the LED, and are any of them non-memory-like?
There are some ethernet signals, a compact flash card detect, other LEDs
and a push button also on port A. Are those what you'd call
non-memory-like?
It's usually easiest to just trust that that part of the code works (in
my experience, that's rarely where a hang actually occurs when bringing
up a new board), and resume tracing after the MMU is on and you've
inserted a caching-inhibited BAT entry.
Where can I find out how to do that? Since I have this board working with
the old ARCH=ppc, can I copy anything from there?
Also, where would be a good place in the code to resume tracing?
Thanks for your help so far. I see now it's probably not the code for
enabling the cache that's causing the problem, it just masks my attempts
at tracing using the LED.
Cheers,
Chris.
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