[U-Boot] [PATCH 07/13] spl mxc nand: Fix broken boot for correctable ECC errors

Benoît Thébaudeau
2012-08-13T20:49:53Z

Do not stop boot as soon as an ECC error is detected. Only stop boot for
uncorrectable ECC errors.

This fixes boards no longer booting after some time because a NAND Flash bit has
flipped.

Signed-off-by: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
---
.../nand_spl/nand_boot_fsl_nfc.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)

diff --git u-boot-4d3c95f.orig/nand_spl/nand_boot_fsl_nfc.c u-boot-4d3c95f/nand_spl/nand_boot_fsl_nfc.c
index 4c5a7fe..ea05952 100644
--- u-boot-4d3c95f.orig/nand_spl/nand_boot_fsl_nfc.c
+++ u-boot-4d3c95f/nand_spl/nand_boot_fsl_nfc.c
@@ -140,9 +140,21 @@ static void nfc_nand_data_output(void)
static int nfc_nand_check_ecc(void)
{
#if defined(MXC_NFC_V1)
- return readw(&nfc->ecc_status_result);
+ u16 ecc_status = readw(&nfc->ecc_status_result);
+ return (ecc_status & 0x3) == 2 || (ecc_status >> 2) == 2;
#elif defined(MXC_NFC_V1_1)
- return readl(&nfc->ecc_status_result);
+ u32 ecc_status = readl(&nfc->ecc_status_result);
+ int ecc_per_page = CONFIG_SYS_NAND_PAGE_SIZE / 512;
+ int err_limit = CONFIG_SYS_NAND_SPARE_SIZE / ecc_per_page > 16 ? 8 : 4;
+ int subpages = CONFIG_SYS_NAND_PAGE_SIZE / 512;
+
+ do {
+ if ((ecc_status & 0xf) > err_limit)
+ return 1;
+ ecc_status >>= 4;
+ } while (--subpages);
+
+ return 0;
#endif
}