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SDIO write/read using CMD53 on C6748

Hi,

I have DSP C6748 which I'm using to communicate with SDIO card. Unfortunately there is no official driver for SDIO so I'm writing one by myself. If there an example for SDIO driver for C6748 (or like) I would be more than happy :)

Currently I know how to use the CMD52 for reading the CCCR but it's not good for reading/writing data buffers. My problems is to understand and find an information how  to read/write buffers using the SDIO_RW_EXTENDED command (CMD53). To start my questions are what bit should be set in MMC/SD registers, what registers to read/write the buffers and etc.

Thanks,

Pavel