*BSD News Article 83006


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From: Ken Bigelow <kbigelow@www.play-hookey.com>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Sio1 not seen
Date: Sat, 16 Nov 1996 20:54:55 +0000
Organization: Erol's Internet Services
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Message-ID: <328E2A1F.1F7A@www.play-hookey.com>
References: <slrn58i4c9.6i.feisal@lancelot.valsayn.tt>
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Feisal Mohammed wrote:
> 
> Hi,
> 
> I have an interesting problem, I have upgraded my CPU from 486/50
> to a Pentium Overdrive/83 and sometimes on bootup sio1 is not seen.
> It happens randomly and the only way to stop it is to boot up with
> -c, go to visual, exit and continue the boot. Is there some timing factor
> I need to
> tweak in the sio driver?  I am running 2.1.0 RELEASE, I will upgrade
> to 2.1.5 but my CD drive just died.  Sio1 is on a USR sportster 28.8
> (16550A) and sio0 is the standard port on the motherboard (16450).
> The machine is a Compaq Presario 850 with 16MB.
> 

Hmmm. I assume that modem/port is on the ISA bus? If so, check your CMOS
setup parameters to make sure that the ISA bus is not running any faster
than 8.000 MHz. (33.3 MHz/4 is too fast; 40/5 just makes it, etc.) It
isn't always true, and most devices will run slightly faster than 8 MHz
without trouble. But every so often I run across some card or other
(usually an NE2000 clone or some such) that just can't handle full
communications when the clock exceeds the 8 MHz spec for this bus.
-- 
Ken

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