From owner-freebsd-current@FreeBSD.ORG  Sun Apr  7 17:42:35 2013
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Date: Sun, 7 Apr 2013 10:42:32 -0700
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Subject: Re: Intel D2500CC motherboard and strange RS232/UART behavior
From: Adrian Chadd <adrian@freebsd.org>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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On 7 April 2013 10:35, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote:
>
> I think if you configure no irq at all, it will automatically
> go to polled mode.
>
> Not sure if uart(4) can actually do that, sio(4) could.

Yup, it does. No IRQ hint == polled mode. It'll say as much in the dmesg.



Adrian