54  *  - a 1 byte Hamming code stored in the OOB for each page
55  *  - a 7 bytes BCH code stored in the OOB for each page
608  * reading OOB only or write status byte).
639  *         It's in fact recv_ecc ^ calc_ecc, where recv_ecc was read from OOB
873  * @ops: the mtd oob structure
875  * Reads flash memory OOB area of pages.
902 	doc_dbg("doc_read_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",  in doc_read_oob()
942 			doc_dbg("OOB - INFO: %*phC\n", 7, oobbuf);  in doc_read_oob()
943 			doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]);  in doc_read_oob()
944 			doc_dbg("OOB - BCH_ECC: %*phC\n", 7, oobbuf + 8);  in doc_read_oob()
945 			doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]);  in doc_read_oob()
1224  * @oob: buffer to get out of band bytes from (can be NULL if no OOB should be
1226  * @autoecc: if 0, all 16 bytes from OOB are taken, regardless of HW Hamming or
1229  *           computations. Its value is not meaningfull is oob == NULL.
1232  * OOB data. The OOB ECC is automatically computed by the hardware Hamming and
1238 			  const u_char *oob, int autoecc)  in doc_write_page()  argument
1260 	if (oob && autoecc) {  in doc_write_page()
1261 		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ, oob);  in doc_write_page()
1263 		oob += DOC_LAYOUT_OOB_UNUSED_OFS;  in doc_write_page()
1275 		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_UNUSED_SZ, oob);  in doc_write_page()
1277 	if (oob && !autoecc)  in doc_write_page()
1278 		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_SIZE, oob);  in doc_write_page()
1299  * @ops: the oob operations
1301  * Returns 0 or 1 if success, -EINVAL if invalid oob mode
1322  * doc_fill_autooob - Fill a 16 bytes OOB from 8 non-ECC bytes
1323  * @dst: the target 16 bytes OOB buffer
1324  * @oobsrc: the source 8 bytes non-ECC OOB buffer
1334  * doc_backup_oob - Backup OOB into docg3 structure
1337  * @ops: the OOB size and buffer
1339  * As the docg3 should write a page with its OOB in one pass, and some userland
1340  * applications do write_oob() to setup the OOB and then write(), store the OOB
1342  * applications could store an OOB, and then write their pages (which will
1343  * result into one having its OOB corrupted).
1346  * the page data _and_ the OOB area.
1378  * @ops: the mtd oob structure
1380  * Either write OOB data into a temporary buffer, for the subsequent write
1381  * page. The provided OOB should be 16 bytes long. If a data buffer is provided
1383  * Or provide data without OOB, and then a all zeroed OOB will be used (ECC will
1396 	u8 oob[DOC_LAYOUT_OOB_SIZE];  in doc_write_oob()  local
1410 	doc_dbg("doc_write_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",  in doc_write_oob()
1444 		memset(oob, 0, sizeof(oob));  in doc_write_oob()
1446 			memcpy(oob, docg3->oob_write_buf, DOC_LAYOUT_OOB_SIZE);  in doc_write_oob()
1448 			doc_fill_autooob(oob, oobbuf);  in doc_write_oob()
1450 			memcpy(oob, oobbuf, DOC_LAYOUT_OOB_SIZE);  in doc_write_oob()
1451 		ret = doc_write_page(docg3, ofs, buf, oob, autoecc);  in doc_write_oob()