>>> On 22.09.16 at 17:04, <tianyu....@intel.com> wrote:
> On 9/22/2016 10:26 PM, Jan Beulich wrote:
>>>> But please also answer the earlier question, which you did strip
>>>> >> from your reply:
>>>> >>
>>>>> >>> Which btw raises another question: Why are you in polling mode in
>>>>> >>> the first place? Do you have a UART without working interrupt?
>>> >
>>> > I found there was no interrupt with Xen ns16550 dirver while
>>> > linux kernel's serial driver can receive interrupt.
>> And do you know the reason? Is it perhaps a PCI plug in card, and
>> you don't specify the IRQ on the command line? Or the kernel
>> doesn't provide the necessary information (from ACPI) for Xen to
>> set up that IRQ?
> No, I am not familiar serial device. But it's a ACPI device from linux
> sysfs node and serial drivers use irq 4 for their interrupt both on
> linux and Xen.

Hmm - I do not see why IRQ4 would not work, especially if it does
under Linux.


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