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search_bbt(9) [centos man page]

SEARCH_BBT(9)						    Internal Functions Provided 					     SEARCH_BBT(9)

search_bbt - [GENERIC] scan the device for a specific bad block table SYNOPSIS
int search_bbt(struct mtd_info * mtd, uint8_t * buf, struct nand_bbt_descr * td); ARGUMENTS
mtd MTD device structure buf temporary buffer td descriptor for the bad block table DESCRIPTION
Read the bad block table by searching for a given ident pattern. Search is preformed either from the beginning up or from the end of the device downwards. The search starts always at the start of a block. If the option NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains the bad block information of this chip. This is necessary to provide support for certain DOC devices. The bbt ident pattern resides in the oob area of the first page in a block. AUTHOR
Thomas Gleixner <> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SEARCH_BBT(9)

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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); 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 (* init_size) (struct mtd_info *mtd, struct nand_chip *this,u8 *id_data); 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,uint32_t offset, int data_len, const uint8_t *buf,int oob_required, int page, int cached, int raw); int (* onfi_set_features) (struct mtd_info *mtd, struct nand_chip *chip,int feature_addr, uint8_t *subfeature_para); int (* onfi_get_features) (struct mtd_info *mtd, struct nand_chip *chip,int feature_addr, uint8_t *subfeature_para); int chip_delay; unsigned int options; unsigned int bbt_options; int page_shift; int phys_erase_shift; int bbt_erase_shift; int chip_shift; int numchips; uint64_t chipsize; int pagemask; int pagebuf; unsigned int pagebuf_bitflips; int subpagesize; uint8_t cellinfo; int badblockpos; int badblockbits; int onfi_version; struct nand_onfi_params onfi_params; 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; 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 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 function for controlling ALE/CLE/nCE. Also used to write command and address init_size [BOARDSPECIFIC] hardwarespecific function for setting mtd->oobsize, mtd->writesize and so on. id_data contains the 8 bytes values of NAND_CMD_READID. Return with the bus width. dev_ready [BOARDSPECIFIC] hardwarespecific function for accessing 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 onfi_set_features [REPLACEABLE] set the features for ONFI nand onfi_get_features [REPLACEABLE] get the features for ONFI nand chip_delay [BOARDSPECIFIC] chip dependent delay for transferring 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. bbt_options [INTERN] bad block specific options. All options used here must come from bbm.h. By default, these options will be copied to the appropriate nand_bbt_descr's. 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. pagebuf_bitflips [INTERN] holds the bitflip count for the page 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. badblockbits [INTERN] minimum number of set bits in a good block's bad block marker position; i.e., BBM == 11110111b is not bad when badblockbits == 7 onfi_version [INTERN] holds the chip ONFI version (BCD encoded), non 0 if ONFI supported. onfi_params [INTERN] holds the ONFI page parameter when ONFI is supported, 0 otherwise. state [INTERN] the current state of the NAND device oob_poi "poison value buffer," used for laying out OOB data before writing controller [REPLACEABLE] a pointer to a hardware controller structure which is shared among multiple independent devices. ecclayout [REPLACEABLE] the default ECC placement scheme ecc [BOARDSPECIFIC] ECC control structure buffers buffer structure for read/write hwcontrol platform-specific hardware control structure 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 data AUTHOR
Thomas Gleixner <> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT NAND_CHIP(9)
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