AVR-Chat

I am trying to interface some AVR boards to an Arm9 board (Atmel at91RM9200
@ ~60mhz).  This worked at one point but now it isn't and I am getting
stumped.

There appears to be ~200ns of delay between the SDA and SCL when generating
the START condition.  This seems too small for the AVR @ 12mhz but I can't
tell from the data sheet.  

When running my commands (SMBus master/slave) from another AVR everything
works as expected.  When the ARM9 is the master nothing works even though
the waveforms on the bus appear correct.  The only thing I am not sure of is
the start condition as I have only an analog scope with a ~100ns or so delay
line...

So, the question: has anyone connected an ARM9 with an AVR via I2C (oh, btw
this is using Linux with our own driver) and got it to work?  Any setup or
operational gotcha's I need to know about?

-----------
Larry Barello
www.barello.net