You want to:

a) Use your own code on the NOOK to use the SD port pins in bit banged
asynchronous mode?

b) Use your own code on the NOOK to use the SD port pins in
synchronous SPI mode?

c) Use another device like a PIC and connect it to the SD port pins in
asynchronous mode?

d) Use another device like a PIC and connect it to the SD port pins in
synchronous SPI mode?

e) Some other option?
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