There are other ecc modes for the fcb out there.
Signed-off-by: Jan Remmet <j.remmet@xxxxxxxxx>
---
common/imx-bbu-nand-fcb.c | 83 +++++++++++++++++++++++++++--------------------
1 file changed, 47 insertions(+), 36 deletions(-)
diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
index 1db4c5a..34a5f83 100644
--- a/common/imx-bbu-nand-fcb.c
+++ b/common/imx-bbu-nand-fcb.c
@@ -167,6 +167,46 @@ static uint32_t calc_chksum(void *buf, size_t size)
return ~chksum;
}
+struct fcb_block *read_fcb_hamming_13_8(void *rawpage)
+{
+ int i;
+ int bitflips = 0, bit_to_flip;
+ u8 parity, np, syndrome;
+ u8 *fcb, *ecc;
+
+ fcb = rawpage + 12;
+ ecc = rawpage + 512 + 12;
+
+ for (i = 0; i < 512; i++) {
+ parity = ecc[i];
+ np = calculate_parity_13_8(fcb[i]);
+
+ syndrome = np ^ parity;
+ if (syndrome == 0)
+ continue;
+
+ if (!(hweight8(syndrome) & 1)) {
+ pr_err("Uncorrectable error at offset %d\n", i);
+ return ERR_PTR(-EIO);
+ }
+
+ bit_to_flip = lookup_single_error_13_8(syndrome);
+ if (bit_to_flip < 0) {
+ pr_err("Uncorrectable error at offset %d\n", i);
+ return ERR_PTR(-EIO);
+ }
+
+ bitflips++;
+
+ if (bit_to_flip > 7)
+ ecc[i] ^= 1 << (bit_to_flip - 8);
+ else
+ fcb[i] ^= 1 << bit_to_flip;
+ }
+
+ return xmemdup(rawpage + 12, 512);
+}
+
static __maybe_unused void dump_fcb(void *buf)
{
struct fcb_block *fcb = buf;
@@ -258,11 +298,8 @@ static ssize_t raw_write_page(struct mtd_info *mtd, void *buf, loff_t offset)
static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
{
- int i;
- int bitflips = 0, bit_to_flip;
- u8 parity, np, syndrome;
- u8 *fcb, *ecc;
int ret;
+ struct fcb_block *fcb;
void *rawpage;
*retfcb = NULL;
@@ -275,40 +312,14 @@ static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
goto err;
}
- fcb = rawpage + 12;
- ecc = rawpage + 512 + 12;
-
- for (i = 0; i < 512; i++) {
- parity = ecc[i];
- np = calculate_parity_13_8(fcb[i]);
-
- syndrome = np ^ parity;
- if (syndrome == 0)
- continue;
-
- if (!(hweight8(syndrome) & 1)) {
- pr_err("Uncorrectable error at offset %d\n", i);
- ret = -EIO;
- goto err;
- }
-
- bit_to_flip = lookup_single_error_13_8(syndrome);
- if (bit_to_flip < 0) {
- pr_err("Uncorrectable error at offset %d\n", i);
- ret = -EIO;
- goto err;
- }
-
- bitflips++;
-
- if (bit_to_flip > 7)
- ecc[i] ^= 1 << (bit_to_flip - 8);
- else
- fcb[i] ^= 1 << bit_to_flip;
+ fcb = read_fcb_hamming_13_8(rawpage);
+ if (IS_ERR(fcb)) {
+ pr_err("Cannot read fcb\n");
+ ret = PTR_ERR(fcb);
+ goto err;
}
- *retfcb = xmemdup(rawpage + 12, 512);
-
+ *retfcb = fcb;
ret = 0;
err:
free(rawpage);
--
2.7.4
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