I note from the Gumstix website that you are unaware of the availability of SD card drivers
at the current time. I am currently working on a product based on the Motorola (now
called Freescale) i-MXL (ARM920T) device which has an on-board SD/MMC host
controller. If you look on www.freescale.com/imx and look for the software section,
you will find a Linux BSP for the device that includes such drivers. You may need to
do some low level stuff for the basic block read/write operations. However, you
might find it gets you started.
 

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