mtd: nand: raw: rockchip_nfc: fix oobfree offset and description

The MTD framework reserves 1 or 2 bytes for the bad block marker
depending on the bus size. The rockchip_nfc driver currently only
supports a 8 bit bus, but reserves standard 2 bytes for the BBM.
The first free OOB byte is therefore OOB2 at offset 2.
Page address(PA) bytes are moved to the last 4 positions before
ECC. Update the description for U-boot.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/drivers/mtd/nand/raw/rockchip_nfc.c b/drivers/mtd/nand/raw/rockchip_nfc.c
index 25e0497..5fcf6a6 100644 (file)
--- a/drivers/mtd/nand/raw/rockchip_nfc.c
+++ b/drivers/mtd/nand/raw/rockchip_nfc.c
@@ -487,10 +487,10 @@ static int rk_nfc_write_page_raw(struct mtd_info *mtd,
                 *
                 *    BBM  OOB1 OOB2 OOB3 |......|  PA0  PA1  PA2  PA3
                 *
-                * The rk_nfc_ooblayout_free() function already has reserved
-                * these 4 bytes with:
+                * The oobfree structure already has reserved these 4 bytes
+                * together with 2 bytes for BBM by reducing it's length:
                 *
-                * oob_region->offset = NFC_SYS_DATA_SIZE + 2;
+                * oobfree[0].length = rknand->metadata_size - NFC_SYS_DATA_SIZE - 2;
                 */
                if (!i)
                        memcpy(rk_nfc_oob_ptr(chip, i),
@@ -867,7 +867,7 @@ static int rk_nfc_ecc_init(struct rk_nfc *nfc, struct nand_chip *chip)
                ecc->layout->eccpos[i] = rknand->metadata_size + i;
 
        ecc->layout->oobfree[0].length = rknand->metadata_size - NFC_SYS_DATA_SIZE - 2;
-       ecc->layout->oobfree[0].offset = NFC_SYS_DATA_SIZE + 2;
+       ecc->layout->oobfree[0].offset = 2;
 
        return 0;
 }