FAT FileSystem in PIC18

CurroRomero Guest #1680894
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Hi, I want to use a FAT filesystem like Chan's FatFS or EFSL to PIC18, I 
have already got low level routines for accessing an SD card, but:

What files of FatFS package do I need to modify?
Which ones do I NOT have to modify?
How do I link FatFS to my low level routines, so that it can access the 
SD card through the SPI lines?

I have low level routines for SPI and MMC/SD card, if anybody is 
interested drop me an email and I will send to you.
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