The kernel uses these bytes to differentiate between erased/programmed
pages.
Signed-off-by: Jan Luebbe <jlu@xxxxxxxxxxxxxx>
---
drivers/mtd/nand/nand_omap_gpmc.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/mtd/nand/nand_omap_gpmc.c b/drivers/mtd/nand/nand_omap_gpmc.c
index 9050a8d..b81ad53 100644
--- a/drivers/mtd/nand/nand_omap_gpmc.c
+++ b/drivers/mtd/nand/nand_omap_gpmc.c
@@ -751,6 +751,35 @@ static int omap_gpmc_read_page_bch_rom_mode(struct mtd_info *mtd,
return 0;
}
+static void omap_gpmc_write_page_bch_rom_mode(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf)
+{
+ int i, eccsize = chip->ecc.size;
+ int eccbytes = chip->ecc.bytes;
+ int eccsteps = chip->ecc.steps;
+ uint8_t *ecc_calc = chip->buffers->ecccalc;
+ const uint8_t *p = buf;
+ uint32_t *eccpos = chip->ecc.layout->eccpos;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
+ chip->write_buf(mtd, p, eccsize);
+ chip->ecc.calculate(mtd, p, &ecc_calc[i]);
+ }
+
+ for (i = 0; i < chip->ecc.total; i++)
+ chip->oob_poi[eccpos[i]] = ecc_calc[i];
+
+ /*
+ * set padding byte for each subpage to 0x00, so the kernel
+ * can detect erased pages
+ */
+ for (i = 0; i < 4; i++) {
+ chip->oob_poi[1+14*(i+1)] = 0x00;
+ }
+
+ chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+}
static int omap_gpmc_eccmode(struct gpmc_nand_info *oinfo,
enum gpmc_ecc_mode mode)
{
@@ -823,6 +852,7 @@ static int omap_gpmc_eccmode(struct gpmc_nand_info *oinfo,
oinfo->nand.ecc.bytes = 4 * 13;
oinfo->nand.ecc.size = 4 * 512;
nand->ecc.read_page = omap_gpmc_read_page_bch_rom_mode;
+ nand->ecc.write_page = omap_gpmc_write_page_bch_rom_mode;
omap_oobinfo.oobfree->length = 0;
j = 0;
for (i = 2; i < 15; i++)
--
1.7.10.4
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