550  * 1. Both DATA and OOB need to be checked for number of 0. The
551  *    top-level API can be called with only data buf or OOB buf so use
552  *    chip->data_buf if data buf is null and chip->oob_poi if oob buf
555  * 3. For each CW, check the number of 0 in cw_data and usable OOB bytes.
790 		dev_err(nandc->dev, "failure to read page/oob\n");  in read_page_ecc()
798  * a helper that copies the last step/codeword of a page (containing free oob)
1012 		 * to oob for the first n - 1 codewords since these oob regions  in qcom_nandc_write_page()
1015 		 * write to the free oob area.  in qcom_nandc_write_page()
1115  * the NAND controller cannot write only data or only OOB within a codeword
1116  * since ECC is calculated for the combined codeword. So update the OOB from
1125 	u8 *oob = chip->oob_poi;  in qcom_nandc_write_oob()  local
1135 	/* calculate the data and oob size for the last codeword/step */  in qcom_nandc_write_oob()
1140 	/* override new oob content to last codeword */  in qcom_nandc_write_oob()
1141 	mtd_ooblayout_get_databytes(mtd, nandc->data_buffer + data_size, oob,  in qcom_nandc_write_oob()
1154 		dev_err(nandc->dev, "failure to write oob\n");  in qcom_nandc_write_oob()
1174 	 * portion of oob. we just want the first few bytes from this codeword  in qcom_nandc_block_bad()
1298  * the following OOB layout arrangement:
1306  *  first n - 1       nth OOB region
1307  *  OOB regions
1311  * * = FREE OOB bytes
1317  * inaccessible Bad Block byte(s) are ignored when we write to a page/oob,
1318  * and assumed as 0xffs when we read a page/oob. The ECC, unused and
1390 	 * Each CW has 4 available OOB bytes which will be protected with ECC  in qcom_nand_attach_chip()
1450 	 * step. It gives us a clean representation of the oob area (even if  in qcom_nand_attach_chip()