Re: How to get rom code to go on FADS?

Richard Hendricks wrote:

"Dan A. Dickey" wrote:

...

quoted

So, I'm attributing this recent success to:
        A)  Setting SYPCR in the rom code fairly early on.
        B)  Issuing a "rms der 0" to mpc8bug when it is connected.

Interesting.  So clearing the SYPCR early in the ROM code is what
was preventing you from getting the code to run stand-alone?  Kinda
odd, considering the initial value of the watchdog is very long,
and you were having problems getting your Aux LED to turn on
right at the very beginning.

I believe that was at least a goodly portion of it.
It is interesting to note that the Aux LED still doesn't
blink unless the ADI & mpc8bug are connected.
Stand alone - no blinking light.  I'm going to
attribute this for the time being to the UPM not
being initialized - or some piece of hardware.
In any case, I was trying to use the Aux LED as
an indicator of how far the cpu got through the
code.  Getting to the point of an 8xxrom prompt
at which I can enter 'bootz', hit C/R, and see
linux boot up was enough for me to yank the assembly
version of the Aux LED blinking code.

I also think it was the delays I put in between
turning the light on/off that caused it to take too
long and for the watchdog to bite.

I might add that doing the "rms der 0" helped tremendously
as well.  I can now leave the ADI & mpc8bug connected
(for flashing new code) - but still allow linux to load
& start.  It doesn't without doing that (even though
8xxrom sets DER to 0!).
	-Dan

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