traditional bug: only one of two serial ports found on HP Vectra XM

traditional bug: only one of two serial ports found on HP Vectra XM

[Ulrich Windl]

Hello,

historically I believed Linux very much. When it said my HP Vecra XM 
only has one serial port I was surprised, but believed it. That was 
some years ago. 2.4.18 still says that there is one serial port:

ttyS00 at 0x3f8 (irq=4) as a 16550A

However recently I had to work on the backside of the PC and found 
two(!) serial ports labelled "Serial A" and "Serial B". So shouldn't 
both ports be detected?

Regards,
Ulrich Windl
(the one who is NOT subscribed in this honourable list)

Re: traditional bug: only one of two serial ports found on HP Vectra XM

[Denis Vlasenko]

On 17 April 2002 04:54, Ulrich Windl wrote:
> historically I believed Linux very much. When it said my HP Vecra XM
> only has one serial port I was surprised, but believed it. That was
> some years ago. 2.4.18 still says that there is one serial port:
>
> ttyS00 at 0x3f8 (irq=4) as a 16550A
>
> However recently I had to work on the backside of the PC and found
> two(!) serial ports labelled "Serial A" and "Serial B". So shouldn't
> both ports be detected?

How about opening the case and checking whether those ports actually
connected to motherboard? Checking BIOS config?
Without waiting for another 'some years' :-)

Seriously, do you have any reason to think second port is really
exists beside physical connector?
--
vda

Re: traditional bug: only one of two serial ports found on HP Vectra XM

[Gunther Mayer]

Denis Vlasenko wrote:

> On 17 April 2002 04:54, Ulrich Windl wrote:
> > historically I believed Linux very much. When it said my HP Vecra XM
> > only has one serial port I was surprised, but believed it. That was
> > some years ago. 2.4.18 still says that there is one serial port:
> >
> > ttyS00 at 0x3f8 (irq=4) as a 16550A
> >
> > However recently I had to work on the backside of the PC and found
> > two(!) serial ports labelled "Serial A" and "Serial B". So shouldn't
> > both ports be detected?
>
> How about opening the case and checking whether those ports actually
> connected to motherboard? Checking BIOS config?
> Without waiting for another 'some years' :-)
>
> Seriously, do you have any reason to think second port is really
> exists beside physical connector?

If it exists, check if "lspnp" on a PNPBIOS enabled kernel would find your
second port. There have been patches to find BIOS configured serial ports
even if not at standard places.