extern int mtd_open(const char *mtd, bool block);
extern int mtd_check_open(const char *mtd);
+extern int mtd_block_is_bad(int fd, int offset);
extern int mtd_erase_block(int fd, int offset);
extern int mtd_write_buffer(int fd, const char *buf, int offset, int length);
extern int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir);