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Date: Sun, 13 Jul 1997 19:21:14 -0400 (EDT)
From: Drew Derbyshire <ahd@kew.com>
Message-Id: <199707132321.TAA01158@pandora.hh.kew.com>
To: hackers@freebsd.org
Subject: access to SIO port freezes FreeBSD 2.2.1
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

Here's a wacky one ...

I have two systems both running FreeBSD 2.2.1 with four serial ports
enabled.  

	athena is a 386/33 with 16M, ISA bus, two dumb serial ports,
	two internal modems with FIFO UARTS.  Modems are COM3/COM4,
	IRQ 5 and 9; one is IBM/Reveal v.32, other is Zoom v.34

	pandora is a 386/66 with VLB for the display, but mostly ISA
	with two dumb serial ports and two 16650x uarts.  FIFO UARTs are
	COM3/COM4, IRQ 9 and 5.

Due to a "little" accident with athena (why in hell I give myself
root password, I don't know, but it's another story anyway), I
needed to put the modems into pandora.  So I disable the internal
dumb ports, move the FIFO UART's to COM1/COM2, and put the modems
in at COM3/COM4, IRQ 5 and regen the kernel, and system comes up
fine.

Then I enable ttyd2 and ttyd3, and HUP init, and it hangs.  Solid.
Can't even get console to switch screens or reboot.  Works out that
ttyd3 works, but not ttyd2 (v.32).  Windows 95 sees it, FreeBSD
sees it, but locks solid when opening.  Same two modems worked
great 24 hours before on pandora's little sister.

Suggestions as to where to look?

-ahd-
--
Drew Derbyshire                 Internet:       ahd@kew.com
Kendra Electronic Wonderworks   Telephone:      617-279-9812

"Men are like fudge: sweet, but dense and rarely good for you."
                                        -- Audrey Walton-Hadlock, '99