New Serial Problems (was Re: [Soekris] gotcha with the net4501 clock) phk at
Fri Feb 14 08:00:23 UTC 2003

In message <4D297825-3F6B-11D7-9565-000393BB56F2 at>, David Kel

>Very interesting because "me too, the older 4501's work better." While 
>I "knew" the main crystal wasn't part of the problem, it was the only 
>visible difference between the working units and randomly failing 
>units. All the failing units had 33.3333 MHz main crystals. We tried 
>swapping a 32.768 MHz crystal from a working unit and the problem 
>stayed with the PCB. So its not some oddball thing happening in the 

The serial port is clocked from the 32.768 kHz "cmos" crystal.  If
the PLL which runs the frequency up is unstable, the serial port
would suffer, but I doubt that is the problem.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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