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Date:      Fri, 01 Sep 2000 12:32:14 -0600
From:      Warner Losh <imp@village.org>
To:        Gary Kline <kline@thought.org>
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: bad 16550A maybe? 
Message-ID:  <200009011832.MAA37168@harmony.village.org>
In-Reply-To: Your message of "Thu, 31 Aug 2000 22:01:56 PDT." <200009010501.WAA54972@tao.thought.org> 
References:  <200009010501.WAA54972@tao.thought.org>  

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In message <200009010501.WAA54972@tao.thought.org> Gary Kline writes:
:   This just showed up on my console (and dmesg) from my new 4.1 system:
:   sio0: 1 more silo overflow (total 1)
:   Could this be why moused is having trouble with recognizing my 
:   COM1 mouse?  Bad 16550A?

Maybe.  silo overflows happen because the machine is too slow to
service the interrupt before the buffer overflows (but unless it is a
386SX25 you should have enough CPU power).  It can also be caused by
baud rate mismatches, but that's fairly rare and unusual (you usually
get framing errors from a 16550A in this case).  This can also be
caused by other hardware misbehaving and blocking interrupts.

Warner


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