[ntp:questions] Interesting PPS/GPS interaction discovery

A C agcarver+ntp at acarver.net
Sun Sep 4 22:48:24 UTC 2011

On 9/4/2011 15:29, unruh wrote:
> What kind of serial port do you have? Is it a legacy serial portwith
> interrupt<9, or is it a serial card with a shared serial port?
> It sounds like the serial port driver is taking over the interrupt as
> a non-shared interrupt and when the PPS driver comes in, it never gets
> any signal from the serial port because the serial port driver is
> servicing the interrupt and never passing it on.

This is a Sun sparc IPX using one of the on-board Zilog 8530 serial 
ports.  I couldn't tell you what interrupt priority it has off the top 
of my head, I'll have to go digging for that.

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