sio => uart: one port is gone

[Jeremy Chadwick]

On Mon, Sep 15, 2008 at 06:38:02PM +0300, Andriy Gapon wrote:
> on 15/09/2008 17:36 Ian Smith said the following:
>> On Mon, 15 Sep 2008, Andriy Gapon wrote:
>>  > This is a fairly standard and old machine with 2 COM ports.
>>  > Recently (last Friday) I decided to update my RELENG_7 system and also
>>  > to transition from sio to uart.
>>  >  > This what I had before the upgrade:
>>  > kernel: sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags
>>  > 0x10 on acpi0
>>  > kernel: sio0: type 16550A
>>  > kernel: sio0: [FILTER]
>>  > kernel: sio1: <16550A-compatible COM port> port 0x2e8-0x2ef irq 3 on acpi0
>>  > kernel: sio1: type 16550A
>>  > kernel: sio1: [FILTER]
>>  >  > This is what I have now:
>>  > uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
>>  > uart0: [FILTER]
>>  >  > This is what I have in device.hints for uart:
>>  > hint.uart.0.at="isa"
>>  > hint.uart.0.port="0x3F8"
>>  > hint.uart.0.flags="0x10"
>>  > hint.uart.0.irq="4"
>>  > hint.uart.1.at="isa"
>>  > hint.uart.1.port="0x2F8"
>>
>> but it's shown as 0x2e8 above ..
>>
>>  > hint.uart.1.irq="3"
>>  > hint.uart.2.at="isa"
>>  >  > Precisely the same hints (s/uart/sio/) I had for sio.
>>
>> 0x2f8 is 'standard COM2' address .. did sio1 work ok at 0x2e8 before?
>
> Ian,
>
> thank you, I guess I had a typo in my hints, but the port did work.
> Looking at the old dmesg I see that sio devices are found 'on acpi0' as  
> opposed to uart now being found on 'isa0'.
> Maybe this is another difference.
>
> Maybe sio was attached using some information from acpi, so hints were  
> not that important. But maybe the same acpi information is not applied  
> to uart, so it does depend on the hints.
>
> If this guess is correct then this is a regression in sio=>uart  
> transition, if not, then I'll just correct my device.hints and shut up 
> :-)

I've CC'd Marcel Moolenaar, who can very likely explain what's going
on here.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |