text: #ifndef __BMT_H__
  #define __BMT_H__
  
  //#include "nand_def.h"
  #include <linux/types.h>
  
  //#define MTK_NAND_BMT_DEBUG
  
  
  #if defined(__PRELOADER_NAND__)
  
  #include "nand.h"
  
  #elif defined(__UBOOT_NAND__)
  
  #include <linux/mtd/nand.h>
  #include "mt6575_typedefs.h"
  #include "mt6575_nand.h"
  
  #elif defined(__KERNEL_NAND__)
  
  //#include <linux/mtd/mtd.h>
  //#include <linux/mtd/nand.h>
  //#include "mt6575_nand.h"
  //#include <linux/mtd/mt6575_typedefs.h>
  
  #endif
  
  #define MAX_BMT_SIZE        (0x80)
  #define BMT_VERSION         (1)         // initial version
  
  #define MAIN_SIGNATURE_OFFSET   (0)
  //#define OOB_SIGNATURE_OFFSET    (1)
  #define OOB_SIGNATURE_OFFSET    (11)
  //#define OOB_INDEX_OFFSET        (29)
  // in case of 512 byte size page only has 16 bytes spare area, so we move the offset from 29 to 14
  #define OOB_INDEX_OFFSET        (14)
  #define OOB_INDEX_SIZE          (2)
  #define FAKE_INDEX              (0xAAAA)
  
  typedef struct _bmt_entry_
  {
      u16 bad_index;      // bad block index
      u16 mapped_index;  // mapping block index in the replace pool
  } bmt_entry;
  
  typedef enum
  {
      UPDATE_ERASE_FAIL,
      UPDATE_WRITE_FAIL,
      UPDATE_UNMAPPED_BLOCK,
      UPDATE_REASON_COUNT,
  } update_reason_t;
  
  typedef struct {
      bmt_entry table[MAX_BMT_SIZE];
      u8 version;
      u8 mapped_count;                // mapped block count in pool
      u8 bad_count;                   // bad block count in pool. Not used in V1
  }bmt_struct;
  
  
  /***************************************************************
  *                                                              *
  * Interface BMT need to use                                    *
  *                                                              *
  ***************************************************************/
  #if defined(__PRELOADER_NAND__)
  
  extern int mt6575_nand_read_page_hw(u32 page, u8 *dat, u8 *oob);
  extern bool nand_block_bad_hw(u32 offset);
  extern bool mt6575_nand_erase_hw(u32 offset);
  extern bool mark_block_bad_hw(u32 offset);
  extern int mt6575_nand_write_page_hw(u32 page, u8 *dat, u8 *oob);
  
  #elif defined(__UBOOT_NAND__)
  
  extern bool mt6575_nand_exec_read_page_hw(struct nand_chip *nand, u32 page, u32 page_size, u8 *dat, u8 *oob);
  extern bool nand_block_bad_hw(struct nand_chip *nand, u32 offset);
  
  #elif defined(__KERNEL_NAND__)
  
  //extern bool mt6575_nand_exec_read_page(struct mtd_info *mtd, u32 row, u32 page_size, u8 *dat, u8 *oob);
  //extern int mt6575_nand_block_bad_hw(struct mtd_info *mtd, loff_t ofs);
  //extern int mt6575_nand_erase_hw(struct mtd_info *mtd, int page);
  //extern int mt6575_nand_block_markbad_hw(struct mtd_info *mtd, loff_t ofs);
  //extern int mt6575_nand_exec_write_page(struct mtd_info *mtd, u32 row, u32 page_size, u8 *dat, u8 *oob);
  
  extern int nfc_read_page(struct ra_nand_chip *ra, char *buf, int page, int flags);
  extern int nand_block_checkbad(struct ra_nand_chip *ra, loff_t offs);
  extern int nfc_erase_block(struct ra_nand_chip *ra, int row_addr);
  extern int nfc_write_oob(struct ra_nand_chip *ra, int page, unsigned int offs, char *buf, int len, int flags);
  extern int nfc_write_page(struct ra_nand_chip *ra, char *buf, int page, int flags);
  #endif
  
  
  
  /***************************************************************
  *                                                              *
  * Different function interface for preloader/uboot/kernel      *
  *                                                              *
  ***************************************************************/
  void set_bad_index_to_oob(u8 *oob, u16 index);
  
  
  #if defined(__PRELOADER_NAND__)
  
  bmt_struct *init_bmt(struct nand_chip* nand, int size);
  bool update_bmt(u32 offset, update_reason_t reason, u8 *dat, u8 *oob);
  unsigned short get_mapping_block_index(int index);
  
  #elif defined(__UBOOT_NAND__)
  
  bmt_struct *init_bmt(int size);
  bool update_bmt(u32 offset, update_reason_t reason, u8 *dat, u8 *oob);
  unsigned short get_mapping_block_index(int index);
  int update_bmt_page(int *page, u8 *oob);
  
  #elif defined(__KERNEL_NAND__)
  
  bmt_struct *init_bmt(struct ra_nand_chip* nand, struct mtd_info *mtd, int size);
  bool update_bmt(u32 offset, update_reason_t reason, u8 *dat, u8 *oob);
  unsigned short get_mapping_block_index(int index);
  int update_bmt_page(int *page, u8 *oob);
  
  #endif
  
  
  #endif // #ifndef __BMT_H__
  