linux-kernel - Re: [PATCH 2/2] [POWERPC] mmio ide support for mpc8349-itx target

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Date:	Sat, 7 Jul 2007 17:12:44 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...abs.org
Cc:	Olof Johansson <olof@...om.net>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] [POWERPC] mmio ide support for mpc8349-itx target

On Saturday 07 July 2007, Olof Johansson wrote:
> On Sat, Jul 07, 2007 at 01:49:00PM +0400, Vitaly Bordug wrote:
> > 
> > This updates relevant platform code
> > (freescale mpc8349itx target) to make the CompactFlash
> > work in TrueIDE mode.
> 
> Shouldn't you be writing a PCMCIA driver instead for the CF, so it
> handles other devices as well? Then you get storage "for free", as
> well as hotplug, etc.

CF memory cards can be in either TrueIDE mode or PCMCIA mode. If you
only need to support memory cards, you should always use True-IDE
mode, because that offers a _much_ higher throughput with PIO mode
6 (25 MB/s) or UDMA mode 6 (133MB/s), compared to the PIO mode 0
(3.3 MB/s) in PCMCIA mode.

Of course, if the bus can only sustain PIO mode 0 anyway, you can
just as well do a PCMCIA driver, and get the ability to plug in
other cards, e.g. wlan or modem cards.

	Arnd <><
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