-int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare);
-int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
-int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
-int nandmtd_InitialiseNAND(yaffs_Device *dev);
+#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 18))
+extern struct nand_oobinfo yaffs_oobinfo;
+extern struct nand_oobinfo yaffs_noeccinfo;
+#endif
+int nandmtd_EraseBlockInNAND(yaffs_dev_t *dev, int blockNumber);
+int nandmtd_InitialiseNAND(yaffs_dev_t *dev);