SDIO SDHC 8GB SD memory

I am using STM32F4xx with SDIO port to SanDisk SDIN5C2-8G 8GB using Keils SDIO driver.

I am getting finit(NULL) returning 1 every time.
Debugging shows commands being sent not getting any response.

Does Keil support SDHC memory at 8GB ?
Do I need to implement my own driver to support this memory ?.
Any examples available ?

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