Re: [Xen-ia64-devel] [PATCH 0/6] Add full evtchn mechanism forxen/ia64

[Alex Williamson <alex.williamson@xxxxxx>]

On Mon, 2006-05-22 at 16:26 +0200, Tristan Gingold wrote:
> Le Lundi 22 Mai 2006 16:12, Alex Williamson a écrit :
> > Such a feature would need to be aware
> > of both I/O port and MMIO UARTs and handle UARTs described in ACPI
> > namespace.  Thanks,
> Modifying ACPI to hide an UART seems to be very hard...

   Yes, very hard might even be an understatement ;^)

> Just an idea: if UART is used by Xen, it should reverse the interrupt line 
> (unless shared...)  In this case, Linux shouldn't be allowed to register an 
> handler for this IRQ and should fail to use the UART.  Right ?

   Good thought, I'd have to look at the serial driver to see what it
would do in that case.  It might end up switching to polling mode and
still try to use the UART.  Thanks,

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab


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