Talking SPI using the sd card slot

[Philip Ashmore <contact@philipashmore.com>]

Hi there.

This is about talking SPI with 1/2/4/8 simultaneous data streams at
25MHz/50MHz from a desktop/laptop amd/intel pc with a built in or
external sd card reader at 3.3v.

I originally posted this question here:
http://stackoverflow.com/questions/25507249/how-do-i-control-an-sd-card-reader-using-spidev

lsusb reports my device as a "Alcor Micro Corp. Multi Flash Reader" but
that device is only present when I have an sd card in the slot, so
something's adding it and removing it.

It's that "something" that I want to replace with spidev (somehow).

I've built a custom kernel to enable the experimental spidev module but
I've no clue about how to proceed.

Any takers?

Regards,
Philip Ashmore