Date: Mon, 14 Jul 1997 08:37:15 -0400 From: Drew Derbyshire <ahd@kew.com> To: Nate Williams <nate@mt.sri.com> Cc: hackers@freebsd.org Subject: Re: access to SIO port freezes FreeBSD 2.2.1 Message-ID: <33CA1D7B.3432@kew.com> 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.
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