total hang when cu -l /dev/cuaa0

[Bernd Walter]

On Fri, Oct 03, 2003 at 11:23:34PM +0200, Christoph P. Kukulies wrote:
> On Fri, Oct 03, 2003 at 10:15:08PM +0200, Bernd Walter wrote:
> > On Fri, Oct 03, 2003 at 08:21:28PM +0200, C. Kukulies wrote:
> > > 
> > > 
> > > I have disabled the SIO on my ASUS P4SX board because I have a PCI modem
> > > card inserted. But the modem card or the sio on it doesn't seem to be detected
> > > by the kernel. Instead I see two sios (sio0 and sio1) which are flagged
> > > as possibly disabled (?) - why are they seen when I disabled them in the BIOS?
> > 
> > PCI serials shouldn't collide with legacy ones - PCI has different IO
> > Space.
> > Many boards don't disable interfaces completely - I wouldn't be suprised
> > if just the irq was dropped.
> > You need a different driver for your PCI one - e.g. puc.
> > The modem coild also be something proprietary for which there is no
> > driver available.
> > 
> > > When I run getty (or mgetty) on that port or when I do a cu -l /dev/cuaa0
> > > the system freezes.
> > 
> > Why do you expect anything usefull by accessing half working hardware?
> 
> Well, I would expect an I/O error or no such device. Wouldn't that be
> at least a minimum one could expect? But a crash or hand? No.
> one could expect? But a crash or hand? No.

You can't expect anything reliable from a device which is broken.
The kernel already warned you that something seems to be questionable.
In the same way you can't expect getting an IO error if someone cuts
into your computer with a chainsaw - you may get one, but nobody can
predict.

-- 
B.Walter                   BWCT                http://www.bwct.de
ticso at bwct.de                                  info at bwct.de