BBB RTC IRQ bare metal

[dd]

Hi I have had the RTC interrupts running bare metal for years. 

The interrupt is goes off every second.  The ISR increments a counter.

This counter indicates the routine is being called dozens of times (or it appears so). 

This was tolerable but i could never figure out if this was some spurious IRQ activity. 

Now that ethernet/DMA is running, and much more MPU activity, the RTC occasionally

causes spurious MPU hang. 

any suggestions?

thanks...................dd