This patch mainly fixes ecc-layout for following ecc-schemes, to bring them
in sync with u-boot omap_gpmc NAND driver:
- BCH4_SW: OMAP_ECC_BCH4_CODE_HW_DETECTION_SW
This ecc-scheme is mainly used on AM35xx and other legacy platforms.
- BCH8_SW: OMAP_ECC_BCH8_CODE_HW_DETECTION_SW
This ecc-scheme is mainly used on OMAP3x and other legacy platforms.
Apart from above, this patch also touches other ecc-schemes as the fix
required refactoring common code, into ecc-scheme specific code.
Hence, end-to-end NAND boot sequence was tested on AM335x-EVM to avoid
any further regression on legacy or current platforms.
(BCH8_HW) (HAM1_HW) (HAM1_HW) (HAM1_HW) (UBIFS)
ROM ---------> SPL ---------> U-Boot ---------> Kernel ---------> File-System
(BCH8_HW) (BCH8_SW) (BCH8_SW) (BCH8_SW) (UBIFS)
ROM ---------> SPL ---------> U-Boot ---------> Kernel ---------> File-System
(BCH8_HW) (BCH8_HW) (BCH8_HW) (BCH8_HW) (UBIFS)
ROM ---------> SPL ---------> U-Boot ---------> Kernel ---------> File-System
*Configurations used to build u-boot and kernel for end-to-end NAND boot*
+------------+--------------------------------------------+------------------+
| ecc-scheme | u-boot/SPL configs | kernel DTS |
+------------+--------------------------------------------+------------------+
| | | |
| HAM1_HW | #define CONFIG_NAND_OMAP_ECCSCHEME \ |ti,nand-ecc-opts= |
| | OMAP_ECC_HAM1_CODE_HW | "ham1" |
| (1-bit | #define CONFIG_SYS_NAND_ECCBYTES 3 | |
| Hamming | #define CONFIG_SYS_NAND_ECCPOS \ | |
| using h/w) | { 1, 2, 3, 4, 5, 6, 7, 8, 9, \ | |
| | 10, 11, 12 } | |
| | (for NAND page-size=2048) | |
| | | |
+------------+--------------------------------------------+------------------+
| | | |
| BCH8_SW | #define CONFIG_NAND_OMAP_ECCSCHEME \ |ti,nand-ecc-opts= |
| | OMAP_ECC_BCH8_CODE_HW_DETECTION_SW | "bch8" |
|(8-bit BCH | #define CONFIG_SYS_NAND_ECCBYTES 13 |(without ELM node)|
| using s/w | #define CONFIG_BCH | |
|library for | #undef CONFIG_SPL_NAND_AM33XX_BCH | |
|for ECC | #define CONFIG_SPL_NAND_SIMPLE | |
| error | #define CONFIG_SYS_NAND_ECCPOS \ | |
|correction) | {2, 3, 4, 5, 6, 7, 8, 9, 10, \ | |
| | 11, 12, 13, 14, \ | |
| | 16, 17, 18, 19, 20, 21, 22, 23, 24, \ | |
| | 25, 26, 27, 28, \ | |
| | 30, 31, 32, 33, 34, 35, 36, 37, 38, \ | |
| | 39, 40, 41, 42, \ | |
| | 44, 45, 46, 47, 48, 49, 50, 51, 52, \ | |
| | 53, 54, 55, 56, } | |
| | (for NAND page-size=2048) | |
| | #define CONFIG_SYS_NAND_ECCSIZE 512 | |
| | | |
+------------+--------------------------------------------+------------------+
| | | |
| BCH8_HW | #define CONFIG_NAND_OMAP_ECCSCHEME \ |ti,nand-ecc-opts= |
| | OMAP_ECC_BCH8_CODE_HW | "bch8" |
|(8-bit BCH | #define CONFIG_SYS_NAND_ECCBYTES 14 | |
| using ELM | #define CONFIG_SPL_NAND_AM33XX_BCH |(with ELM node) |
| h/w engine | #define CONFIG_SYS_NAND_ECCPOS \ |ti,elm-id=<&elm> |
|for ECC | {2, 3, 4, 5, 6, 7, 8, 9, \ | |
| error | 10, 11, 12, 13, 14, 15, 16, 17, \ | |
|correction) | 18, 19, 20, 21, 22, 23, 24, 25, \ | |
| | 26, 27, 28, 29, 30, 31, 32, 33, \ | |
| | 34, 35, 36, 37, 38, 39, 40, 41, \ | |
| | 42, 43, 44, 45, 46, 47, 48, 49, \ | |
| | 50, 51, 52, 53, 54, 55, 56, 57, } | |
| | (for NAND page-size=2048) | |
| | #define CONFIG_SYS_NAND_ECCSIZE 512 | |
| | | |
+------------+--------------------------------------------+------------------+
Test1: flash ubi image from u-boot and boot the kernel
U-boot> mw 0x82000000 0xff <u-boot.img size aligned to NAND block boundary>
U-boot> fatload mmc 0 0x82000000 u-boot.img
U-boot> nand erase <u-boot_offset> <u-boot.img size>
U-boot> nand write 0x82000000 <u-boot_offset> <u-boot.img size>
U-boot> setenv bootargs 'console=ttyO0,115200n8 noinitrd mem=256M \
root=ubi0 rw rootfstype=ubifs ubi.mtd=<mtdpart-of-rootfs>,\
<page-size> ip=off init=/init'
U-boot> bootm <kernel_offset>
Test2: update u-boot.img from kernel and re-boot
Kernel> flash_erase /dev/<mtdpart-of-u-boot> 0 0
Kernel> nandwrite -s 0 /dev/<mtdpart-of-u-boot> u-boot.img
Kernel> reboot
Signed-off-by: Pekon Gupta <pekon@xxxxxx>
---
drivers/mtd/nand/omap2.c | 33 +++++++++++++++++++++++++--------
1 file changed, 25 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index bbdb5e8..e7836bf 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1633,6 +1633,7 @@ static int omap_nand_probe(struct platform_device *pdev)
int i;
dma_cap_mask_t mask;
unsigned sig;
+ unsigned oob_index;
struct resource *res;
struct mtd_part_parser_data ppdata = {};
@@ -1832,9 +1833,11 @@ static int omap_nand_probe(struct platform_device *pdev)
(mtd->writesize /
nand_chip->ecc.size);
if (nand_chip->options & NAND_BUSWIDTH_16)
- ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;
+ oob_index = BADBLOCK_MARKER_LENGTH;
else
- ecclayout->eccpos[0] = 1;
+ oob_index = 1;
+ for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
+ ecclayout->eccpos[i] = oob_index;
break;
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
@@ -1851,7 +1854,13 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->eccbytes = nand_chip->ecc.bytes *
(mtd->writesize /
nand_chip->ecc.size);
- ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;
+ oob_index = BADBLOCK_MARKER_LENGTH;
+ for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
+ if ((i % nand_chip->ecc.bytes) || (i == 0))
+ ecclayout->eccpos[i] = oob_index;
+ else
+ ecclayout->eccpos[i] = ++oob_index;
+ }
/* software bch library is used for locating errors */
nand_chip->ecc.priv = nand_bch_init(mtd,
nand_chip->ecc.size,
@@ -1885,7 +1894,9 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->eccbytes = nand_chip->ecc.bytes *
(mtd->writesize /
nand_chip->ecc.size);
- ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;
+ oob_index = BADBLOCK_MARKER_LENGTH;
+ for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
+ ecclayout->eccpos[i] = oob_index;
/* This ECC scheme requires ELM H/W block */
if (is_elm_present(info, pdata->elm_of_node, BCH4_ECC) < 0) {
pr_err("nand: error: could not initialize ELM\n");
@@ -1913,7 +1924,13 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->eccbytes = nand_chip->ecc.bytes *
(mtd->writesize /
nand_chip->ecc.size);
- ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;
+ oob_index = BADBLOCK_MARKER_LENGTH;
+ for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) {
+ if ((i % nand_chip->ecc.bytes) || (i == 0))
+ ecclayout->eccpos[i] = oob_index;
+ else
+ ecclayout->eccpos[i] = ++oob_index;
+ }
/* software bch library is used for locating errors */
nand_chip->ecc.priv = nand_bch_init(mtd,
nand_chip->ecc.size,
@@ -1954,7 +1971,9 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->eccbytes = nand_chip->ecc.bytes *
(mtd->writesize /
nand_chip->ecc.size);
- ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;
+ oob_index = BADBLOCK_MARKER_LENGTH;
+ for (i = 0; i < ecclayout->eccbytes; i++, oob_index++)
+ ecclayout->eccpos[i] = oob_index;
break;
#else
pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
@@ -1968,8 +1987,6 @@ static int omap_nand_probe(struct platform_device *pdev)
goto return_error;
}
- for (i = 1; i < ecclayout->eccbytes; i++)
- ecclayout->eccpos[i] = ecclayout->eccpos[0] + i;
/* check if NAND device's OOB is enough to store ECC signatures */
if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) {
pr_err("not enough OOB bytes required = %d, available=%d\n",
--
1.8.1
--
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