we need a new way to access serial ports

[covici at ccs.covici.com]

Is there any way you could open the port from kernel space as though you
were in user space and just write to it without taking exclusive
control?

Trevor Astrope <astrope at tabbweb.com> wrote:

> I'm pretty sure this is also the code that fails with a pci express
> serial card if you define the irq and i/o port in the kernel serial.h
> header with earlier kernels.
> 
> On Sat, 26 Jun 2010, Chris Brannon wrote:
> 
> > Apparently, what we have isn't working for some people, as of the 2.6.34
> > kernel.
> > Here's the piece of code from src/serialio.c which is failing:
> >
> > 	if (synth_request_region(ser->port, 8)) {
> > 		/* try to take it back. */
> > 		printk("Ports not available, trying to steal them\n");
> > 		__release_region(&ioport_resource, ser->port, 8);
> > 		if (synth_request_region(ser->port, 8))
> > 			return NULL;
> > 	}
> >
> > -- Chris
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> >
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-- 
Your life is like a penny.  You're going to lose it.  The question is:
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you spend it?

         John Covici
         covici at ccs.covici.com