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:

quoted

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 <><