14  * depending on the options in the BBT descriptor(s). If no flash based BBT
16  * marked good / bad blocks. This information is used to create a memory BBT.
19  * If a flash based BBT is specified then the function first tries to find the
20  * BBT on flash. If a BBT is found then the contents are read and the memory
21  * based BBT is created. If a mirrored BBT is selected then the mirror is
23  * version number, then the mirror BBT is used to build the memory based BBT.
26  * If no BBT exists at all then the device is scanned for factory marked
30  * the BBT is searched and read but never created
49  * 10b:		block is reserved (to protect the bbt area)
56  * - the space necessary for a bbt in FLASH does not exceed a block boundary
81 	uint8_t entry = chip->bbt[block >> BBT_ENTRY_SHIFT];  in bbt_get_entry()
90 	chip->bbt[block >> BBT_ENTRY_SHIFT] |= msk;  in bbt_mark_entry()
141  * @td: BBT descriptor used for computation
163  * @num: the number of bbt descriptors to read
164  * @td: the bbt describtion table
189 			 * In case the BBT marker is not in the OOB area it  in read_bbt()
199 				pr_info("nand_bbt: ECC error in BBT at 0x%012llx\n",  in read_bbt()
203 				pr_info("nand_bbt: corrected error in BBT at 0x%012llx\n",  in read_bbt()
207 				pr_info("nand_bbt: error reading BBT\n");  in read_bbt()
260  * that the bbt bits are in consecutive order.
287 /* BBT marker is in the first page, no OOB */
384  * assume that the bbt bits are in consecutive order.
516  * NAND_BBT_PERCHIP is given, each chip is searched for a bbt, which contains
520  * The bbt ident pattern resides in the oob area of the first page in a block.
540 	/* Do we have a bbt per chip? */  in search_bbt()
573 	/* Check, if we found a bbt for each requested chip */  in search_bbt()
738 			/* Preset the bbt area with 0xff */  in write_bbt()
779 			/* Do not store the reserved bbt blocks! */  in write_bbt()
815  * The function creates a memory based bbt by scanning the device for
826  * check_create - [GENERIC] create and write bbt(s) if necessary
832  * / updates the bbt(s) if necessary. Creation is necessary if no bbt was found
844 	/* Do we have a bbt per chip? */  in check_create()
967 	/* Do we have a bbt per chip? */  in mark_bbt_region()
1086 	this->bbt = kzalloc(len, GFP_KERNEL);  in nand_scan_bbt()
1087 	if (!this->bbt)  in nand_scan_bbt()
1096 			pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n");  in nand_scan_bbt()
1113 	/* Is the bbt at a given page? */  in nand_scan_bbt()
1125 	/* Prevent the bbt regions from erasing / writing */  in nand_scan_bbt()
1134 	kfree(this->bbt);  in nand_scan_bbt()
1135 	this->bbt = NULL;  in nand_scan_bbt()
1155 	if (!this->bbt || !td)  in nand_update_bbt()
1165 	/* Do we have a bbt per chip? */  in nand_update_bbt()
1200 /* Generic flash bbt descriptors */
1246  * nand_create_badblock_pattern - [INTERN] Creates a BBT descriptor structure
1339 	pr_debug("nand_isbad_bbt(): bbt info for offs 0x%08x: (block %d) 0x%02x\n",  in nand_isbad_bbt()
1354  * nand_markbad_bbt - [NAND Interface] Mark a block bad in the BBT