accessing compact flash ?????

Environment in which system works:

Microblaze softcore processor on spartan 3 fpga board
compact flash, acting as a mass storage.

How to access the compact flash in embedded applications
write to and read from the compact flash? how to access the FAT table?
to which sector i need to write, which address?

which mode of addressing is easy way out
CHS or LBA??

I got no clue how to access, it would be great help if i could
understand in and out of doing tht becoz i need to write a code in C

Thanks in advance