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i have developed a LPC2388 based board which has an SPI Flash memory Chip. This Memory will be used as the USB MSC storage media. Also I want to put the FAT file system in this flash mem,and access the files stored. For this i am planning to use the KEIL RL-FlashFS Library. First of all,I want to know whether i can do all the above things. Has anybody worked on the RL_flashFS? What are the functions to be called to initialise the FAT file system in the SPI flash mem? i have tried using finit() and fformat()but the memory seems to be still uninitialised and i am not able to use the fopen / fclose function. the Controller justs hangs. I have made all the required changes for SPI flash mem access,fs_spi_ProgramPage() function and the FS_SPI_FlashDev.h header and the necessary changes in File_Config.h.Am i missing something? Please help Thanks, Vinaya