linux-kernel - Re: [PATCH 7/7] serial/8250: make PIO support optional

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Message-Id: <201107042237.05295.arnd@arndb.de>
Date:	Mon, 4 Jul 2011 22:37:05 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"Greg Kroah-Hartman" <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 7/7] serial/8250: make PIO support optional

On Monday 04 July 2011 21:53:36 Alan Cox wrote:
> > Ok, makes sense. If I split this out to the ISA driver, I would
> > probably also disallow changing io_type, as ISA 8250 ports are
> > all based on PIO mode.
> 
> Alas not, they also come in MMIO form now and then, not often but just
> enough to be annoyingly unignorable. However the ISA driver can handle
> that 'in-house' and I've never seen anything but PIO or simple MMIO.

Ok.

How are people using those ISA cards today? The version of setserial
that I found is not able to set MMIO mode on those. I suppose you
are not talking about isapnp cards, right? Those should not need to
be handled through the ISA driver at all.

	Arnd
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