[SLL] trouble with extra serial ports. doesn't look like irq problems...

[Chuck Wolber]

On Wed, 27 Apr 2005, Ben Johnson wrote:

> I paid a little extra to have three extra serial ports soldered onto a 
> small system, which gives me four in all.  Two of the ports don't work. 
> When I open the device with 'cat /dev/ttyS2' the peripheral LED lights 
> and there are no errors...  unless I set the IRQ to something like 17. 
> They will not transfer data.  A command like the one I just wrote will 
> block forever on the problem ports in a situation which causes the other 
> ports to return data immediately.  I can use setserial to shuffle the 
> IRQ assignments all over the place without any positive change.  I think 
> this means my last two serial ports are broken.  Is there something 
> besides IRQs I can check?

I'm *ASSUMING* you're doing this on a Linux system (you didn't explicitly 
say so and /dev/ttyS0 can be found on other *IX systems). If so, you need 
to ensure that you've compiled support for extra serial ports into your 
kernel.

-Chuck


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