int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
int yflash_InitialiseNAND(yaffs_Device *dev);
int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
int yflash_InitialiseNAND(yaffs_Device *dev);
int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);