3com 3CCFEM556B pcmcia crashes machine

[Warner Losh]

> Hi people, I have a 3com 3CCFEM556B pcmcia lan+modem, when I connected it
> shows the model and the next two last lines after machine crashes:
>  
> 
> sio4: type 16550A with a bogus IIR_TXRDY register
> sio4: unable to activate interrupt in fast mode - using normal mode
> 
> I think that it is a IRQ problem, but doesn't have the experience to solve
> it.
> 
> Any suggestion?

Which revision of FreeBSD?  Do other cards work?

Warner