READ_BBT(9) Internal Functions Provided READ_BBT(9)NAME
read_bbt - [GENERIC] Read the bad block table starting from page
SYNOPSIS
int read_bbt(struct mtd_info * mtd, uint8_t * buf, int page, int num, struct nand_bbt_descr * td, int offs);
ARGUMENTS
mtd
MTD device structure
buf
temporary buffer
page
the starting page
num
the number of bbt descriptors to read
td
the bbt describtion table
offs
offset in the memory table
DESCRIPTION
Read the bad block table starting from page.
AUTHOR
Thomas Gleixner <tglx@linutronix.de>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 READ_BBT(9)
Check Out this Related Man Page
STRUCT NAND_CHIP(9) Structures STRUCT NAND_CHIP(9)NAME
struct_nand_chip - NAND Private Flash Chip Data
SYNOPSIS
struct nand_chip {
void __iomem * IO_ADDR_R;
void __iomem * IO_ADDR_W;
uint8_t (* read_byte) (struct mtd_info *mtd);
u16 (* read_word) (struct mtd_info *mtd);
void (* write_buf) (struct mtd_info *mtd, const uint8_t *buf, int len);
void (* read_buf) (struct mtd_info *mtd, uint8_t *buf, int len);
int (* verify_buf) (struct mtd_info *mtd, const uint8_t *buf, int len);
void (* select_chip) (struct mtd_info *mtd, int chip);
int (* block_bad) (struct mtd_info *mtd, loff_t ofs, int getchip);
int (* block_markbad) (struct mtd_info *mtd, loff_t ofs);
void (* cmd_ctrl) (struct mtd_info *mtd, int dat,unsigned int ctrl);
int (* dev_ready) (struct mtd_info *mtd);
void (* cmdfunc) (struct mtd_info *mtd, unsigned command, int column, int page_addr);
int (* waitfunc) (struct mtd_info *mtd, struct nand_chip *this);
void (* erase_cmd) (struct mtd_info *mtd, int page);
int (* scan_bbt) (struct mtd_info *mtd);
int (* errstat) (struct mtd_info *mtd, struct nand_chip *this, int state, int status, int page);
int (* write_page) (struct mtd_info *mtd, struct nand_chip *chip,const uint8_t *buf, int page, int cached, int raw);
int chip_delay;
unsigned int options;
int page_shift;
int phys_erase_shift;
int bbt_erase_shift;
int chip_shift;
int numchips;
uint64_t chipsize;
int pagemask;
int pagebuf;
int subpagesize;
uint8_t cellinfo;
int badblockpos;
flstate_t state;
uint8_t * oob_poi;
struct nand_hw_control * controller;
struct nand_ecclayout * ecclayout;
struct nand_ecc_ctrl ecc;
struct nand_buffers * buffers;
struct nand_hw_control hwcontrol;
struct mtd_oob_ops ops;
uint8_t * bbt;
struct nand_bbt_descr * bbt_td;
struct nand_bbt_descr * bbt_md;
struct nand_bbt_descr * badblock_pattern;
void * priv;
};
MEMBERS
IO_ADDR_R
[BOARDSPECIFIC] address to read the 8 I/O lines of the flash device
IO_ADDR_W
[BOARDSPECIFIC] address to write the 8 I/O lines of the flash device
read_byte
[REPLACEABLE] read one byte from the chip
read_word
[REPLACEABLE] read one word from the chip
write_buf
[REPLACEABLE] write data from the buffer to the chip
read_buf
[REPLACEABLE] read data from the chip into the buffer
verify_buf
[REPLACEABLE] verify buffer contents against the chip data
select_chip
[REPLACEABLE] select chip nr
block_bad
[REPLACEABLE] check, if the block is bad
block_markbad
[REPLACEABLE] mark the block bad
cmd_ctrl
[BOARDSPECIFIC] hardwarespecific funtion for controlling ALE/CLE/nCE. Also used to write command and address
dev_ready
[BOARDSPECIFIC] hardwarespecific function for accesing device ready/busy line If set to NULL no access to ready/busy is available and
the ready/busy information is read from the chip status register
cmdfunc
[REPLACEABLE] hardwarespecific function for writing commands to the chip
waitfunc
[REPLACEABLE] hardwarespecific function for wait on ready
erase_cmd
[INTERN] erase command write function, selectable due to AND support
scan_bbt
[REPLACEABLE] function to scan bad block table
errstat
[OPTIONAL] hardware specific function to perform additional error status checks (determine if errors are correctable)
write_page
[REPLACEABLE] High-level page write function
chip_delay
[BOARDSPECIFIC] chip dependent delay for transfering data from array to read regs (tR)
options
[BOARDSPECIFIC] various chip options. They can partly be set to inform nand_scan about special functionality. See the defines for
further explanation
page_shift
[INTERN] number of address bits in a page (column address bits)
phys_erase_shift
[INTERN] number of address bits in a physical eraseblock
bbt_erase_shift
[INTERN] number of address bits in a bbt entry
chip_shift
[INTERN] number of address bits in one chip
numchips
[INTERN] number of physical chips
chipsize
[INTERN] the size of one chip for multichip arrays
pagemask
[INTERN] page number mask = number of (pages / chip) - 1
pagebuf
[INTERN] holds the pagenumber which is currently in data_buf
subpagesize
[INTERN] holds the subpagesize
cellinfo
[INTERN] MLC/multichip data from chip ident
badblockpos
[INTERN] position of the bad block marker in the oob area
state
[INTERN] the current state of the NAND device
oob_poi
poison value buffer
controller
[REPLACEABLE] a pointer to a hardware controller structure which is shared among multiple independend devices
ecclayout
[REPLACEABLE] the default ecc placement scheme
ecc
[BOARDSPECIFIC] ecc control ctructure
buffers
buffer structure for read/write
hwcontrol
platform-specific hardware control structure
ops
oob operation operands
bbt
[INTERN] bad block table pointer
bbt_td
[REPLACEABLE] bad block table descriptor for flash lookup
bbt_md
[REPLACEABLE] bad block table mirror descriptor
badblock_pattern
[REPLACEABLE] bad block scan pattern used for initial bad block scan
priv
[OPTIONAL] pointer to private chip date
AUTHOR
Thomas Gleixner <tglx@linutronix.de>
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT NAND_CHIP(9)