[U-Boot] load file to memory in standalone program

Hi,I am attempting to read a set of files from the fat file system into a location in memory.This is easy using the command interface using something likefatload mmc 0:1 0x48000000 file.txt However i want to do this in a standalone program. Is there a function call available to do this in a standalone program.if so could someone give an example. Note: i tried do_fat_fsload function call however compiling threw undefined reference. If this is the correct method maybe i am just using it wrong. Thanks Scott