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Date: Mon, 14 Jul 1997 08:37:15 -0400
From: Drew Derbyshire <ahd@kew.com>
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Organization: Kendra Electronic Wonderworks
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To: Nate Williams <nate@mt.sri.com>
CC: hackers@freebsd.org
Subject: Re: access to SIO port freezes FreeBSD 2.2.1
References: <199707132321.TAA01158@pandora.hh.kew.com> <199707140458.WAA18892@rocky.mt.sri.com>
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Nate Williams wrote:
> 
> > So I disable the internal
> > dumb ports, move the FIFO UART's to COM1/COM2, and put the modems
> > in at COM3/COM4, IRQ 5/9 and regen the kernel, and system comes up
                          ^^	(corrected)
> > fine.
> 
> You have both UART's sharing the same IRQ?  

No.  I missed the second IRQ description above (it was correct in the
now deleted first paragraph). I corrected _both_ values in the kernel,
not changing the (working) physical configuration of the modems.  Let me
clarify the final configuration:

Jul 13 15:17:30 pandora /kernel: sio0 at 0x3f8-0x3ff irq 4 on isa
Jul 13 15:17:30 pandora /kernel: sio0: type 16550A
Jul 13 15:17:30 pandora /kernel: sio1 at 0x2f8-0x2ff irq 3 on isa
Jul 13 15:17:30 pandora /kernel: sio1: type 16550A
Jul 13 15:17:30 pandora /kernel: sio2 at 0x3e8-0x3ef irq 5 on isa
Jul 13 15:17:31 pandora /kernel: sio2: type 16550A
Jul 13 15:17:31 pandora /kernel: sio3 at 0x2e8-0x2ef irq 9 on isa
Jul 13 15:17:31 pandora /kernel: sio3: type 16550A            

> Also, some 'internal' serial ports claim to allow themselves to be 
> disabled, but in reality the electronics are still hooked up.

This would not be the problem in this case, because the internal ports
were COM1/COM2, and don't support 0x3e8-0x3ef irq 5.

-- 
Internet:       ahd@kew.com             Voice:          617-279-9810

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