[PATCH 1/2] imx-bbu-nand-fcb: split up read_fcb

[PATCH 1/2] imx-bbu-nand-fcb: split up read_fcb

[Jan Remmet]

There are other ecc modes for the fcb out there.

Signed-off-by: Jan Remmet <j.remmet@phytec.de>
---
 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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[PATCH 2/2] imx-bbu-nand-fcb: add support for imx6ul

[Jan Remmet]

imx6ul secure the fcb with bch 40. The imx-kobs tool use a own modified
bch lib. They reverse the bit order of the data and the ecc.
To use the bch lib in barebox the bytes in the data buffers must be
reversed.
The data layout on nand is bit aligned. But with 40 bits this is not an
issue for imx6ul now.

Signed-off-by: Jan Remmet <j.remmet@phytec.de>
---
 common/Kconfig            |   1 +
 common/imx-bbu-nand-fcb.c | 145 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 143 insertions(+), 3 deletions(-)

diff --git a/common/Kconfig b/common/Kconfig
index ed472a0..a10caf6 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -101,6 +101,7 @@ config BAREBOX_UPDATE_IMX_NAND_FCB
 	depends on BAREBOX_UPDATE
 	depends on MTD_WRITE
 	depends on NAND_MXS
+	select BCH if ARCH_IMX6
 	default y
 
 config UBIFORMAT
diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
index 34a5f83..5d3d3f7 100644
--- a/common/imx-bbu-nand-fcb.c
+++ b/common/imx-bbu-nand-fcb.c
@@ -33,9 +33,12 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/stat.h>
+#include <linux/bch.h>
+#include <linux/bitops.h>
 #include <io.h>
 #include <crc.h>
 #include <mach/generic.h>
+#include <mach/imx6.h>
 #include <mtd/mtd-peb.h>
 
 struct dbbt_block {
@@ -129,6 +132,132 @@ static uint8_t calculate_parity_13_8(uint8_t d)
 	return p;
 }
 
+static uint8_t reverse_bit(uint8_t b)
+{
+	b = (b & 0xf0) >> 4 | (b & 0x0f) << 4;
+	b = (b & 0xcc) >> 2 | (b & 0x33) << 2;
+	b = (b & 0xaa) >> 1 | (b & 0x55) << 1;
+
+	return b;
+}
+
+static void encode_bch_ecc(void *buf, struct fcb_block *fcb, int eccbits)
+{
+	int i, j, m = 13;
+	int blocksize = 128;
+	int numblocks = 8;
+	int ecc_buf_size = (m * eccbits + 7) / 8;
+	struct bch_control *bch = init_bch(m, eccbits, 0);
+	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
+	uint8_t *tmp_buf = xzalloc(blocksize * numblocks);
+	uint8_t *psrc, *pdst;
+
+	/*
+	 * The blocks here are bit aligned. If eccbits is a multiple of 8,
+	 * we just can copy bytes. Otherwiese we must move the blocks to
+	 * the next free bit position.
+	 */
+	BUG_ON(eccbits % 8);
+
+	memcpy(tmp_buf, fcb, sizeof(*fcb));
+
+	for (i = 0; i < numblocks; i++) {
+		memset(ecc_buf, 0, ecc_buf_size);
+		psrc = tmp_buf + i * blocksize;
+		pdst = buf + i * (blocksize + ecc_buf_size);
+
+		/* copy data byte aligned to destination buf */
+		memcpy(pdst, psrc, blocksize);
+
+		/*
+		 * imx-kobs use a modified encode_bch which reverse the
+		 * bit order of the data before calculating bch.
+		 * Do this in the buffer and use the bch lib here.
+		 */
+		for (j = 0; j < blocksize; j++)
+			psrc[j] = reverse_bit(psrc[j]);
+
+		encode_bch(bch, psrc, blocksize, ecc_buf);
+
+		/* reverse ecc bit */
+		for (j = 0; j < ecc_buf_size; j++)
+			ecc_buf[j] = reverse_bit(ecc_buf[j]);
+
+		/* Here eccbuf is byte aligned and we can just copy it */
+		memcpy(pdst + blocksize, ecc_buf, ecc_buf_size);
+	}
+
+	free(ecc_buf);
+	free(tmp_buf);
+	free_bch(bch);
+}
+
+struct fcb_block *read_fcb_bch(void *rawpage, int eccbits)
+{
+	int i, j, ret, errbit, m = 13;
+	int blocksize = 128;
+	int numblocks = 8;
+	int ecc_buf_size = (m * eccbits + 7) / 8;
+	struct bch_control *bch = init_bch(m, eccbits, 0);
+	uint8_t *fcb = xmalloc(numblocks * blocksize);
+	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
+	uint8_t *data_buf = xmalloc(blocksize);
+	unsigned int *errloc = xmalloc(eccbits * sizeof(*errloc));
+	uint8_t *psrc, *pdst;
+
+	/* see encode_bch_ecc */
+	BUG_ON(eccbits % 8);
+
+	for (i = 0; i < numblocks; i++) {
+		psrc = rawpage + 32 + i * (blocksize + ecc_buf_size);
+		pdst = fcb + i * blocksize;
+
+		/* reverse data bit */
+		for (j = 0; j < blocksize; j++)
+			data_buf[j] = reverse_bit(psrc[j]);
+
+		/* reverse ecc bit */
+		for (j = 0; j < ecc_buf_size; j++)
+			ecc_buf[j] = reverse_bit(psrc[j + blocksize]);
+
+		ret = decode_bch(bch, data_buf, blocksize, ecc_buf,
+				 NULL, NULL, errloc);
+
+		if (ret < 0) {
+			pr_err("Uncorrectable error at block %d\n", i);
+			free(fcb);
+			fcb = ERR_PTR(ret);
+			goto out;
+		}
+		if (ret > 0)
+			pr_info("Found %d correctable errors in block %d\n",
+				ret, i);
+
+		for (j = 0; j < ret; j++) {
+			/*
+			 * calculate the reverse position
+			 * pos - (pos % 8) -> byte offset
+			 * 7 - (pos % 8) -> reverse bit position
+			 */
+			errbit = errloc[j] - 2 * (errloc[j] % 8) + 7;
+			pr_debug("Found error: bit %d in block %d\n",
+				 errbit, i);
+			if (errbit < blocksize * 8)
+				change_bit(errbit, psrc);
+			/* else error in ecc, ignore it */
+		}
+		memcpy(pdst, psrc, blocksize);
+	}
+
+out:
+	free(data_buf);
+	free(ecc_buf);
+	free(errloc);
+	free_bch(bch);
+
+	return (struct fcb_block *)fcb;
+}
+
 static void encode_hamming_13_8(void *_src, void *_ecc, size_t size)
 {
 	int i;
@@ -312,7 +441,11 @@ static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
 		goto err;
 	}
 
-	fcb = read_fcb_hamming_13_8(rawpage);
+	if (cpu_is_mx6ul())
+		fcb = read_fcb_bch(rawpage, 40);
+	else
+		fcb = read_fcb_hamming_13_8(rawpage);
+
 	if (IS_ERR(fcb)) {
 		pr_err("Cannot read fcb\n");
 		ret = PTR_ERR(fcb);
@@ -766,8 +899,14 @@ static int imx_bbu_write_fcbs_dbbts(struct mtd_info *mtd, struct fcb_block *fcb)
 
 	fcb_raw_page = xzalloc(mtd->writesize + mtd->oobsize);
 
-	memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
-	encode_hamming_13_8(fcb_raw_page + 12, fcb_raw_page + 12 + 512, 512);
+	if (cpu_is_mx6ul()) {
+		/* 40 bit BCH, for i.MX6UL */
+		encode_bch_ecc(fcb_raw_page + 32, fcb, 40);
+	} else {
+		memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
+		encode_hamming_13_8(fcb_raw_page + 12,
+				    fcb_raw_page + 12 + 512, 512);
+	}
 
 	dbbt = dbbt_data_create(mtd);
 
-- 
2.7.4


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Re: [PATCH 2/2] imx-bbu-nand-fcb: add support for imx6ul

[Jan Remmet]

On Wed, Dec 14, 2016 at 08:59:08AM +0100, Jan Remmet wrote:
> imx6ul secure the fcb with bch 40. The imx-kobs tool use a own modified
> bch lib. They reverse the bit order of the data and the ecc.
> To use the bch lib in barebox the bytes in the data buffers must be
> reversed.
> The data layout on nand is bit aligned. But with 40 bits this is not an
> issue for imx6ul now.
I saw that this wasn't applied, is there any rework needed?

Jan

> 
> Signed-off-by: Jan Remmet <j.remmet@phytec.de>
> ---
>  common/Kconfig            |   1 +
>  common/imx-bbu-nand-fcb.c | 145 +++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 143 insertions(+), 3 deletions(-)
> 
> diff --git a/common/Kconfig b/common/Kconfig
> index ed472a0..a10caf6 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -101,6 +101,7 @@ config BAREBOX_UPDATE_IMX_NAND_FCB
>  	depends on BAREBOX_UPDATE
>  	depends on MTD_WRITE
>  	depends on NAND_MXS
> +	select BCH if ARCH_IMX6
>  	default y
>  
>  config UBIFORMAT
> diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
> index 34a5f83..5d3d3f7 100644
> --- a/common/imx-bbu-nand-fcb.c
> +++ b/common/imx-bbu-nand-fcb.c
> @@ -33,9 +33,12 @@
>  #include <linux/mtd/mtd.h>
>  #include <linux/mtd/nand.h>
>  #include <linux/stat.h>
> +#include <linux/bch.h>
> +#include <linux/bitops.h>
>  #include <io.h>
>  #include <crc.h>
>  #include <mach/generic.h>
> +#include <mach/imx6.h>
>  #include <mtd/mtd-peb.h>
>  
>  struct dbbt_block {
> @@ -129,6 +132,132 @@ static uint8_t calculate_parity_13_8(uint8_t d)
>  	return p;
>  }
>  
> +static uint8_t reverse_bit(uint8_t b)
> +{
> +	b = (b & 0xf0) >> 4 | (b & 0x0f) << 4;
> +	b = (b & 0xcc) >> 2 | (b & 0x33) << 2;
> +	b = (b & 0xaa) >> 1 | (b & 0x55) << 1;
> +
> +	return b;
> +}
> +
> +static void encode_bch_ecc(void *buf, struct fcb_block *fcb, int eccbits)
> +{
> +	int i, j, m = 13;
> +	int blocksize = 128;
> +	int numblocks = 8;
> +	int ecc_buf_size = (m * eccbits + 7) / 8;
> +	struct bch_control *bch = init_bch(m, eccbits, 0);
> +	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
> +	uint8_t *tmp_buf = xzalloc(blocksize * numblocks);
> +	uint8_t *psrc, *pdst;
> +
> +	/*
> +	 * The blocks here are bit aligned. If eccbits is a multiple of 8,
> +	 * we just can copy bytes. Otherwiese we must move the blocks to
> +	 * the next free bit position.
> +	 */
> +	BUG_ON(eccbits % 8);
> +
> +	memcpy(tmp_buf, fcb, sizeof(*fcb));
> +
> +	for (i = 0; i < numblocks; i++) {
> +		memset(ecc_buf, 0, ecc_buf_size);
> +		psrc = tmp_buf + i * blocksize;
> +		pdst = buf + i * (blocksize + ecc_buf_size);
> +
> +		/* copy data byte aligned to destination buf */
> +		memcpy(pdst, psrc, blocksize);
> +
> +		/*
> +		 * imx-kobs use a modified encode_bch which reverse the
> +		 * bit order of the data before calculating bch.
> +		 * Do this in the buffer and use the bch lib here.
> +		 */
> +		for (j = 0; j < blocksize; j++)
> +			psrc[j] = reverse_bit(psrc[j]);
> +
> +		encode_bch(bch, psrc, blocksize, ecc_buf);
> +
> +		/* reverse ecc bit */
> +		for (j = 0; j < ecc_buf_size; j++)
> +			ecc_buf[j] = reverse_bit(ecc_buf[j]);
> +
> +		/* Here eccbuf is byte aligned and we can just copy it */
> +		memcpy(pdst + blocksize, ecc_buf, ecc_buf_size);
> +	}
> +
> +	free(ecc_buf);
> +	free(tmp_buf);
> +	free_bch(bch);
> +}
> +
> +struct fcb_block *read_fcb_bch(void *rawpage, int eccbits)
> +{
> +	int i, j, ret, errbit, m = 13;
> +	int blocksize = 128;
> +	int numblocks = 8;
> +	int ecc_buf_size = (m * eccbits + 7) / 8;
> +	struct bch_control *bch = init_bch(m, eccbits, 0);
> +	uint8_t *fcb = xmalloc(numblocks * blocksize);
> +	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
> +	uint8_t *data_buf = xmalloc(blocksize);
> +	unsigned int *errloc = xmalloc(eccbits * sizeof(*errloc));
> +	uint8_t *psrc, *pdst;
> +
> +	/* see encode_bch_ecc */
> +	BUG_ON(eccbits % 8);
> +
> +	for (i = 0; i < numblocks; i++) {
> +		psrc = rawpage + 32 + i * (blocksize + ecc_buf_size);
> +		pdst = fcb + i * blocksize;
> +
> +		/* reverse data bit */
> +		for (j = 0; j < blocksize; j++)
> +			data_buf[j] = reverse_bit(psrc[j]);
> +
> +		/* reverse ecc bit */
> +		for (j = 0; j < ecc_buf_size; j++)
> +			ecc_buf[j] = reverse_bit(psrc[j + blocksize]);
> +
> +		ret = decode_bch(bch, data_buf, blocksize, ecc_buf,
> +				 NULL, NULL, errloc);
> +
> +		if (ret < 0) {
> +			pr_err("Uncorrectable error at block %d\n", i);
> +			free(fcb);
> +			fcb = ERR_PTR(ret);
> +			goto out;
> +		}
> +		if (ret > 0)
> +			pr_info("Found %d correctable errors in block %d\n",
> +				ret, i);
> +
> +		for (j = 0; j < ret; j++) {
> +			/*
> +			 * calculate the reverse position
> +			 * pos - (pos % 8) -> byte offset
> +			 * 7 - (pos % 8) -> reverse bit position
> +			 */
> +			errbit = errloc[j] - 2 * (errloc[j] % 8) + 7;
> +			pr_debug("Found error: bit %d in block %d\n",
> +				 errbit, i);
> +			if (errbit < blocksize * 8)
> +				change_bit(errbit, psrc);
> +			/* else error in ecc, ignore it */
> +		}
> +		memcpy(pdst, psrc, blocksize);
> +	}
> +
> +out:
> +	free(data_buf);
> +	free(ecc_buf);
> +	free(errloc);
> +	free_bch(bch);
> +
> +	return (struct fcb_block *)fcb;
> +}
> +
>  static void encode_hamming_13_8(void *_src, void *_ecc, size_t size)
>  {
>  	int i;
> @@ -312,7 +441,11 @@ static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
>  		goto err;
>  	}
>  
> -	fcb = read_fcb_hamming_13_8(rawpage);
> +	if (cpu_is_mx6ul())
> +		fcb = read_fcb_bch(rawpage, 40);
> +	else
> +		fcb = read_fcb_hamming_13_8(rawpage);
> +
>  	if (IS_ERR(fcb)) {
>  		pr_err("Cannot read fcb\n");
>  		ret = PTR_ERR(fcb);
> @@ -766,8 +899,14 @@ static int imx_bbu_write_fcbs_dbbts(struct mtd_info *mtd, struct fcb_block *fcb)
>  
>  	fcb_raw_page = xzalloc(mtd->writesize + mtd->oobsize);
>  
> -	memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
> -	encode_hamming_13_8(fcb_raw_page + 12, fcb_raw_page + 12 + 512, 512);
> +	if (cpu_is_mx6ul()) {
> +		/* 40 bit BCH, for i.MX6UL */
> +		encode_bch_ecc(fcb_raw_page + 32, fcb, 40);
> +	} else {
> +		memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
> +		encode_hamming_13_8(fcb_raw_page + 12,
> +				    fcb_raw_page + 12 + 512, 512);
> +	}
>  
>  	dbbt = dbbt_data_create(mtd);
>  
> -- 
> 2.7.4
> 
> 
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Re: [PATCH 2/2] imx-bbu-nand-fcb: add support for imx6ul

[Sascha Hauer]

On Wed, Apr 26, 2017 at 04:43:16PM +0200, Jan Remmet wrote:
> On Wed, Dec 14, 2016 at 08:59:08AM +0100, Jan Remmet wrote:
> > imx6ul secure the fcb with bch 40. The imx-kobs tool use a own modified
> > bch lib. They reverse the bit order of the data and the ecc.
> > To use the bch lib in barebox the bytes in the data buffers must be
> > reversed.
> > The data layout on nand is bit aligned. But with 40 bits this is not an
> > issue for imx6ul now.
> I saw that this wasn't applied, is there any rework needed?

It seems this patch slipped through the cracks. Applied now.

Sascha

> 
> Jan
> 
> > 
> > Signed-off-by: Jan Remmet <j.remmet@phytec.de>
> > ---
> >  common/Kconfig            |   1 +
> >  common/imx-bbu-nand-fcb.c | 145 +++++++++++++++++++++++++++++++++++++++++++++-
> >  2 files changed, 143 insertions(+), 3 deletions(-)
> > 
> > diff --git a/common/Kconfig b/common/Kconfig
> > index ed472a0..a10caf6 100644
> > --- a/common/Kconfig
> > +++ b/common/Kconfig
> > @@ -101,6 +101,7 @@ config BAREBOX_UPDATE_IMX_NAND_FCB
> >  	depends on BAREBOX_UPDATE
> >  	depends on MTD_WRITE
> >  	depends on NAND_MXS
> > +	select BCH if ARCH_IMX6
> >  	default y
> >  
> >  config UBIFORMAT
> > diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
> > index 34a5f83..5d3d3f7 100644
> > --- a/common/imx-bbu-nand-fcb.c
> > +++ b/common/imx-bbu-nand-fcb.c
> > @@ -33,9 +33,12 @@
> >  #include <linux/mtd/mtd.h>
> >  #include <linux/mtd/nand.h>
> >  #include <linux/stat.h>
> > +#include <linux/bch.h>
> > +#include <linux/bitops.h>
> >  #include <io.h>
> >  #include <crc.h>
> >  #include <mach/generic.h>
> > +#include <mach/imx6.h>
> >  #include <mtd/mtd-peb.h>
> >  
> >  struct dbbt_block {
> > @@ -129,6 +132,132 @@ static uint8_t calculate_parity_13_8(uint8_t d)
> >  	return p;
> >  }
> >  
> > +static uint8_t reverse_bit(uint8_t b)
> > +{
> > +	b = (b & 0xf0) >> 4 | (b & 0x0f) << 4;
> > +	b = (b & 0xcc) >> 2 | (b & 0x33) << 2;
> > +	b = (b & 0xaa) >> 1 | (b & 0x55) << 1;
> > +
> > +	return b;
> > +}
> > +
> > +static void encode_bch_ecc(void *buf, struct fcb_block *fcb, int eccbits)
> > +{
> > +	int i, j, m = 13;
> > +	int blocksize = 128;
> > +	int numblocks = 8;
> > +	int ecc_buf_size = (m * eccbits + 7) / 8;
> > +	struct bch_control *bch = init_bch(m, eccbits, 0);
> > +	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
> > +	uint8_t *tmp_buf = xzalloc(blocksize * numblocks);
> > +	uint8_t *psrc, *pdst;
> > +
> > +	/*
> > +	 * The blocks here are bit aligned. If eccbits is a multiple of 8,
> > +	 * we just can copy bytes. Otherwiese we must move the blocks to
> > +	 * the next free bit position.
> > +	 */
> > +	BUG_ON(eccbits % 8);
> > +
> > +	memcpy(tmp_buf, fcb, sizeof(*fcb));
> > +
> > +	for (i = 0; i < numblocks; i++) {
> > +		memset(ecc_buf, 0, ecc_buf_size);
> > +		psrc = tmp_buf + i * blocksize;
> > +		pdst = buf + i * (blocksize + ecc_buf_size);
> > +
> > +		/* copy data byte aligned to destination buf */
> > +		memcpy(pdst, psrc, blocksize);
> > +
> > +		/*
> > +		 * imx-kobs use a modified encode_bch which reverse the
> > +		 * bit order of the data before calculating bch.
> > +		 * Do this in the buffer and use the bch lib here.
> > +		 */
> > +		for (j = 0; j < blocksize; j++)
> > +			psrc[j] = reverse_bit(psrc[j]);
> > +
> > +		encode_bch(bch, psrc, blocksize, ecc_buf);
> > +
> > +		/* reverse ecc bit */
> > +		for (j = 0; j < ecc_buf_size; j++)
> > +			ecc_buf[j] = reverse_bit(ecc_buf[j]);
> > +
> > +		/* Here eccbuf is byte aligned and we can just copy it */
> > +		memcpy(pdst + blocksize, ecc_buf, ecc_buf_size);
> > +	}
> > +
> > +	free(ecc_buf);
> > +	free(tmp_buf);
> > +	free_bch(bch);
> > +}
> > +
> > +struct fcb_block *read_fcb_bch(void *rawpage, int eccbits)
> > +{
> > +	int i, j, ret, errbit, m = 13;
> > +	int blocksize = 128;
> > +	int numblocks = 8;
> > +	int ecc_buf_size = (m * eccbits + 7) / 8;
> > +	struct bch_control *bch = init_bch(m, eccbits, 0);
> > +	uint8_t *fcb = xmalloc(numblocks * blocksize);
> > +	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
> > +	uint8_t *data_buf = xmalloc(blocksize);
> > +	unsigned int *errloc = xmalloc(eccbits * sizeof(*errloc));
> > +	uint8_t *psrc, *pdst;
> > +
> > +	/* see encode_bch_ecc */
> > +	BUG_ON(eccbits % 8);
> > +
> > +	for (i = 0; i < numblocks; i++) {
> > +		psrc = rawpage + 32 + i * (blocksize + ecc_buf_size);
> > +		pdst = fcb + i * blocksize;
> > +
> > +		/* reverse data bit */
> > +		for (j = 0; j < blocksize; j++)
> > +			data_buf[j] = reverse_bit(psrc[j]);
> > +
> > +		/* reverse ecc bit */
> > +		for (j = 0; j < ecc_buf_size; j++)
> > +			ecc_buf[j] = reverse_bit(psrc[j + blocksize]);
> > +
> > +		ret = decode_bch(bch, data_buf, blocksize, ecc_buf,
> > +				 NULL, NULL, errloc);
> > +
> > +		if (ret < 0) {
> > +			pr_err("Uncorrectable error at block %d\n", i);
> > +			free(fcb);
> > +			fcb = ERR_PTR(ret);
> > +			goto out;
> > +		}
> > +		if (ret > 0)
> > +			pr_info("Found %d correctable errors in block %d\n",
> > +				ret, i);
> > +
> > +		for (j = 0; j < ret; j++) {
> > +			/*
> > +			 * calculate the reverse position
> > +			 * pos - (pos % 8) -> byte offset
> > +			 * 7 - (pos % 8) -> reverse bit position
> > +			 */
> > +			errbit = errloc[j] - 2 * (errloc[j] % 8) + 7;
> > +			pr_debug("Found error: bit %d in block %d\n",
> > +				 errbit, i);
> > +			if (errbit < blocksize * 8)
> > +				change_bit(errbit, psrc);
> > +			/* else error in ecc, ignore it */
> > +		}
> > +		memcpy(pdst, psrc, blocksize);
> > +	}
> > +
> > +out:
> > +	free(data_buf);
> > +	free(ecc_buf);
> > +	free(errloc);
> > +	free_bch(bch);
> > +
> > +	return (struct fcb_block *)fcb;
> > +}
> > +
> >  static void encode_hamming_13_8(void *_src, void *_ecc, size_t size)
> >  {
> >  	int i;
> > @@ -312,7 +441,11 @@ static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
> >  		goto err;
> >  	}
> >  
> > -	fcb = read_fcb_hamming_13_8(rawpage);
> > +	if (cpu_is_mx6ul())
> > +		fcb = read_fcb_bch(rawpage, 40);
> > +	else
> > +		fcb = read_fcb_hamming_13_8(rawpage);
> > +
> >  	if (IS_ERR(fcb)) {
> >  		pr_err("Cannot read fcb\n");
> >  		ret = PTR_ERR(fcb);
> > @@ -766,8 +899,14 @@ static int imx_bbu_write_fcbs_dbbts(struct mtd_info *mtd, struct fcb_block *fcb)
> >  
> >  	fcb_raw_page = xzalloc(mtd->writesize + mtd->oobsize);
> >  
> > -	memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
> > -	encode_hamming_13_8(fcb_raw_page + 12, fcb_raw_page + 12 + 512, 512);
> > +	if (cpu_is_mx6ul()) {
> > +		/* 40 bit BCH, for i.MX6UL */
> > +		encode_bch_ecc(fcb_raw_page + 32, fcb, 40);
> > +	} else {
> > +		memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
> > +		encode_hamming_13_8(fcb_raw_page + 12,
> > +				    fcb_raw_page + 12 + 512, 512);
> > +	}
> >  
> >  	dbbt = dbbt_data_create(mtd);
> >  
> > -- 
> > 2.7.4
> > 
> > 
> > _______________________________________________
> > barebox mailing list
> > barebox@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/barebox
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [PATCH 2/2] imx-bbu-nand-fcb: add support for imx6ul

[Jan Remmet]

On Thu, Apr 27, 2017 at 09:01:32AM +0200, Sascha Hauer wrote:
> On Wed, Apr 26, 2017 at 04:43:16PM +0200, Jan Remmet wrote:
> > On Wed, Dec 14, 2016 at 08:59:08AM +0100, Jan Remmet wrote:
> > > imx6ul secure the fcb with bch 40. The imx-kobs tool use a own modified
> > > bch lib. They reverse the bit order of the data and the ecc.
> > > To use the bch lib in barebox the bytes in the data buffers must be
> > > reversed.
> > > The data layout on nand is bit aligned. But with 40 bits this is not an
> > > issue for imx6ul now.
> > I saw that this wasn't applied, is there any rework needed?
> 
> It seems this patch slipped through the cracks. Applied now.

Thanks
Jan
> 
> Sascha
> 
> > 
> > Jan
> > 
> > > 
> > > Signed-off-by: Jan Remmet <j.remmet@phytec.de>
> > > ---
> > >  common/Kconfig            |   1 +
> > >  common/imx-bbu-nand-fcb.c | 145 +++++++++++++++++++++++++++++++++++++++++++++-
> > >  2 files changed, 143 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/common/Kconfig b/common/Kconfig
> > > index ed472a0..a10caf6 100644
> > > --- a/common/Kconfig
> > > +++ b/common/Kconfig
> > > @@ -101,6 +101,7 @@ config BAREBOX_UPDATE_IMX_NAND_FCB
> > >  	depends on BAREBOX_UPDATE
> > >  	depends on MTD_WRITE
> > >  	depends on NAND_MXS
> > > +	select BCH if ARCH_IMX6
> > >  	default y
> > >  
> > >  config UBIFORMAT
> > > diff --git a/common/imx-bbu-nand-fcb.c b/common/imx-bbu-nand-fcb.c
> > > index 34a5f83..5d3d3f7 100644
> > > --- a/common/imx-bbu-nand-fcb.c
> > > +++ b/common/imx-bbu-nand-fcb.c
> > > @@ -33,9 +33,12 @@
> > >  #include <linux/mtd/mtd.h>
> > >  #include <linux/mtd/nand.h>
> > >  #include <linux/stat.h>
> > > +#include <linux/bch.h>
> > > +#include <linux/bitops.h>
> > >  #include <io.h>
> > >  #include <crc.h>
> > >  #include <mach/generic.h>
> > > +#include <mach/imx6.h>
> > >  #include <mtd/mtd-peb.h>
> > >  
> > >  struct dbbt_block {
> > > @@ -129,6 +132,132 @@ static uint8_t calculate_parity_13_8(uint8_t d)
> > >  	return p;
> > >  }
> > >  
> > > +static uint8_t reverse_bit(uint8_t b)
> > > +{
> > > +	b = (b & 0xf0) >> 4 | (b & 0x0f) << 4;
> > > +	b = (b & 0xcc) >> 2 | (b & 0x33) << 2;
> > > +	b = (b & 0xaa) >> 1 | (b & 0x55) << 1;
> > > +
> > > +	return b;
> > > +}
> > > +
> > > +static void encode_bch_ecc(void *buf, struct fcb_block *fcb, int eccbits)
> > > +{
> > > +	int i, j, m = 13;
> > > +	int blocksize = 128;
> > > +	int numblocks = 8;
> > > +	int ecc_buf_size = (m * eccbits + 7) / 8;
> > > +	struct bch_control *bch = init_bch(m, eccbits, 0);
> > > +	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
> > > +	uint8_t *tmp_buf = xzalloc(blocksize * numblocks);
> > > +	uint8_t *psrc, *pdst;
> > > +
> > > +	/*
> > > +	 * The blocks here are bit aligned. If eccbits is a multiple of 8,
> > > +	 * we just can copy bytes. Otherwiese we must move the blocks to
> > > +	 * the next free bit position.
> > > +	 */
> > > +	BUG_ON(eccbits % 8);
> > > +
> > > +	memcpy(tmp_buf, fcb, sizeof(*fcb));
> > > +
> > > +	for (i = 0; i < numblocks; i++) {
> > > +		memset(ecc_buf, 0, ecc_buf_size);
> > > +		psrc = tmp_buf + i * blocksize;
> > > +		pdst = buf + i * (blocksize + ecc_buf_size);
> > > +
> > > +		/* copy data byte aligned to destination buf */
> > > +		memcpy(pdst, psrc, blocksize);
> > > +
> > > +		/*
> > > +		 * imx-kobs use a modified encode_bch which reverse the
> > > +		 * bit order of the data before calculating bch.
> > > +		 * Do this in the buffer and use the bch lib here.
> > > +		 */
> > > +		for (j = 0; j < blocksize; j++)
> > > +			psrc[j] = reverse_bit(psrc[j]);
> > > +
> > > +		encode_bch(bch, psrc, blocksize, ecc_buf);
> > > +
> > > +		/* reverse ecc bit */
> > > +		for (j = 0; j < ecc_buf_size; j++)
> > > +			ecc_buf[j] = reverse_bit(ecc_buf[j]);
> > > +
> > > +		/* Here eccbuf is byte aligned and we can just copy it */
> > > +		memcpy(pdst + blocksize, ecc_buf, ecc_buf_size);
> > > +	}
> > > +
> > > +	free(ecc_buf);
> > > +	free(tmp_buf);
> > > +	free_bch(bch);
> > > +}
> > > +
> > > +struct fcb_block *read_fcb_bch(void *rawpage, int eccbits)
> > > +{
> > > +	int i, j, ret, errbit, m = 13;
> > > +	int blocksize = 128;
> > > +	int numblocks = 8;
> > > +	int ecc_buf_size = (m * eccbits + 7) / 8;
> > > +	struct bch_control *bch = init_bch(m, eccbits, 0);
> > > +	uint8_t *fcb = xmalloc(numblocks * blocksize);
> > > +	uint8_t *ecc_buf = xmalloc(ecc_buf_size);
> > > +	uint8_t *data_buf = xmalloc(blocksize);
> > > +	unsigned int *errloc = xmalloc(eccbits * sizeof(*errloc));
> > > +	uint8_t *psrc, *pdst;
> > > +
> > > +	/* see encode_bch_ecc */
> > > +	BUG_ON(eccbits % 8);
> > > +
> > > +	for (i = 0; i < numblocks; i++) {
> > > +		psrc = rawpage + 32 + i * (blocksize + ecc_buf_size);
> > > +		pdst = fcb + i * blocksize;
> > > +
> > > +		/* reverse data bit */
> > > +		for (j = 0; j < blocksize; j++)
> > > +			data_buf[j] = reverse_bit(psrc[j]);
> > > +
> > > +		/* reverse ecc bit */
> > > +		for (j = 0; j < ecc_buf_size; j++)
> > > +			ecc_buf[j] = reverse_bit(psrc[j + blocksize]);
> > > +
> > > +		ret = decode_bch(bch, data_buf, blocksize, ecc_buf,
> > > +				 NULL, NULL, errloc);
> > > +
> > > +		if (ret < 0) {
> > > +			pr_err("Uncorrectable error at block %d\n", i);
> > > +			free(fcb);
> > > +			fcb = ERR_PTR(ret);
> > > +			goto out;
> > > +		}
> > > +		if (ret > 0)
> > > +			pr_info("Found %d correctable errors in block %d\n",
> > > +				ret, i);
> > > +
> > > +		for (j = 0; j < ret; j++) {
> > > +			/*
> > > +			 * calculate the reverse position
> > > +			 * pos - (pos % 8) -> byte offset
> > > +			 * 7 - (pos % 8) -> reverse bit position
> > > +			 */
> > > +			errbit = errloc[j] - 2 * (errloc[j] % 8) + 7;
> > > +			pr_debug("Found error: bit %d in block %d\n",
> > > +				 errbit, i);
> > > +			if (errbit < blocksize * 8)
> > > +				change_bit(errbit, psrc);
> > > +			/* else error in ecc, ignore it */
> > > +		}
> > > +		memcpy(pdst, psrc, blocksize);
> > > +	}
> > > +
> > > +out:
> > > +	free(data_buf);
> > > +	free(ecc_buf);
> > > +	free(errloc);
> > > +	free_bch(bch);
> > > +
> > > +	return (struct fcb_block *)fcb;
> > > +}
> > > +
> > >  static void encode_hamming_13_8(void *_src, void *_ecc, size_t size)
> > >  {
> > >  	int i;
> > > @@ -312,7 +441,11 @@ static int read_fcb(struct mtd_info *mtd, int num, struct fcb_block **retfcb)
> > >  		goto err;
> > >  	}
> > >  
> > > -	fcb = read_fcb_hamming_13_8(rawpage);
> > > +	if (cpu_is_mx6ul())
> > > +		fcb = read_fcb_bch(rawpage, 40);
> > > +	else
> > > +		fcb = read_fcb_hamming_13_8(rawpage);
> > > +
> > >  	if (IS_ERR(fcb)) {
> > >  		pr_err("Cannot read fcb\n");
> > >  		ret = PTR_ERR(fcb);
> > > @@ -766,8 +899,14 @@ static int imx_bbu_write_fcbs_dbbts(struct mtd_info *mtd, struct fcb_block *fcb)
> > >  
> > >  	fcb_raw_page = xzalloc(mtd->writesize + mtd->oobsize);
> > >  
> > > -	memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
> > > -	encode_hamming_13_8(fcb_raw_page + 12, fcb_raw_page + 12 + 512, 512);
> > > +	if (cpu_is_mx6ul()) {
> > > +		/* 40 bit BCH, for i.MX6UL */
> > > +		encode_bch_ecc(fcb_raw_page + 32, fcb, 40);
> > > +	} else {
> > > +		memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
> > > +		encode_hamming_13_8(fcb_raw_page + 12,
> > > +				    fcb_raw_page + 12 + 512, 512);
> > > +	}
> > >  
> > >  	dbbt = dbbt_data_create(mtd);
> > >  
> > > -- 
> > > 2.7.4
> > > 
> > > 
> > > _______________________________________________
> > > barebox mailing list
> > > barebox@lists.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/barebox
> > 
> > _______________________________________________
> > barebox mailing list
> > barebox@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/barebox
> > 
> 
> -- 
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox

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Re: [PATCH 1/2] imx-bbu-nand-fcb: split up read_fcb

[Sascha Hauer]

On Wed, Dec 14, 2016 at 09:00:03AM +0100, Jan Remmet wrote:
> There are other ecc modes for the fcb out there.
> 
> Signed-off-by: Jan Remmet <j.remmet@phytec.de>
> ---
>  common/imx-bbu-nand-fcb.c | 83 +++++++++++++++++++++++++++--------------------
>  1 file changed, 47 insertions(+), 36 deletions(-)

Applied, thanks

Sascha

> 
> 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
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

-- 
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Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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Re: [PATCH 1/2] imx-bbu-nand-fcb: split up read_fcb

[Jan Remmet]

On Wed, Dec 14, 2016 at 09:00:03AM +0100, Jan Remmet wrote:
> There are other ecc modes for the fcb out there.

sorry double post :(
Jan
> 
> Signed-off-by: Jan Remmet <j.remmet@phytec.de>
> ---
>  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
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox

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[PATCH 1/2] imx-bbu-nand-fcb: split up read_fcb

[Jan Remmet]

There are other ecc modes for the fcb out there.

Signed-off-by: Jan Remmet <j.remmet@phytec.de>
---
 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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