On Thu, May 31, 2007 at 06:43:46PM -0400, Mark Lord wrote: > 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. CF cards support 3 modes (MEM, I/O and True IDE), and neither MEM nor I/O modes can talk IDE. Most often, the PIN 9 is simply shorted to the ground at the connector to set the card in True IDE mode, which makes it emulate a standard IDE disk. Cheers, Willy - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
