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Date:      Wed, 25 May 2005 09:59:13 +0300
From:      Danny Braniss <danny@cs.huji.ac.il>
To:        FreeBSD Current <freebsd-current@freebsd.org>
Subject:   serial hangs kernel
Message-ID:  <E1DaprF-0004z7-M4@cs1.cs.huji.ac.il>

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i've been having some boxes hang solid (only power cycle will work) when
trying to open ttyd0/cuaa0/cuad0.

the message
	sio0: port may not be enabled
gave me the clue, notice that the above is ambivalent. I enabled it in the 
bios,
and now it's working ok, at least on an IBM-R51, i still have to
check it on an IBM-T21 (that DOES have a serial port/outlet), and a
Intel/IBM blade.

so it seems, at first site, that if the sio hardware is on the MB, but
sort of not enabled - because there is no connector -, (why the parallel
port was kept and not the serial is beyond me), trying to open /dev/cuaa0 hangs
the kernel.

Q: in such case, shouldn't it not appear in /dev ?

btw, this is with -stable & -current

danny







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