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LPC1766 FlashFS works not correclty

Dear All:

I wanna start a project with FlashFS to access the on-board AT45DB321 flash, without RT OS.

I configured the FS_SPI_FlashPrg.c, File_Config.c as the RL-ARM guide required.

Here is the problem:

The functions of finit, fformat, fcheck.. can works well, but the fopen and fclose will call the chip boot failed. What is problem?

Thanks!!