Re: Compact Flash performance...

Mark Lord
2007-05-31T22:43:58Z

Jeff Garzik wrote:
> Mark Lord wrote:
>> Some cards may perform better when their "memory" interface is used
>> instead of the "I/O" interface, or vice-versa. I'm not sure which
>> of the two methods was selected by libata (probably the "memory"
>> interface).
>
> I am very CF-ignorant. How does libata select a memory or I/O interface
> on a CF device?

Right. Usually we cannot select them, as it's the wires between
the ATA chipset (motherboard) and the CFCARD that determine this.

So I suppose this means that most implementations are using the I/O access method,
except for some embedded systems where the CFCARD is wired to the host bus
without a separate "controller" chip in between.

Cheers