Linux/PROCESSOR-SDK-AM335X: NAND not detected in Latest ti sdk

Hi Deshvir,

Could you specify which u-boot config file you are using? Are you try to build u-boot with "am335x_evm_nandboot_defconfig" config file?

Also check weather the CONFIG_NAND preprocessor switch is defined.

BR
Tsvetolin Shulev

0143..config.txtHi Tsvetolin,

I'll tell you the way I'm compiling.

1. For u-boot, I'm using the following command:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- am335x_evm_config all

I have attached the generated .config file

2. But for kernel compilation, I'm using specific config file as mentioned below

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- tisdk_am335x-evm_defconfig

CONFIG_NAND preprocessor switch is not defined.

Thanks and Regards

Deshvir Malik

Hi Tsvetolin,

I have done the pin muxing of NAND in u-boot and it seems that nand is getting detected but new error is coming this time as indicated by red color font. 

Could you suggest something on this error?

U-Boot 2016.05-00305-g3b08611-dirty (Mar 30 2017 - 13:02:13 +0530)

CPU  : AM335X-GP rev 2.1

Inside show_board_info
Model: TI AM335x BeagleBone Black
       Watchdog enabled
DRAM:  256 MiB
NAND:  nand: error: insufficient OOB: require=106
0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env

Thanks and Regards

Deshvir Malik

Deshvir,

The error message "nand: error: insufficient OOB: require=106" is caused by unsuccessful checking of ecc-scheme requirements before updating ecc info. This check is executed in case of using hardware error code correction in ../u-boot/drivers/mtd/nand/omap_gpmc.c file but there is 3 different place where the message can be printed. For further debugging you can add additional prints. I suggest you to try to use software ECC as attempt for workaround.

BR
Tsvetolin Shulev

Hi Tsvetolin,

I have modified the code at "u-boot/drivers/mtd/nand/omap_gpmc.c" and gave the errors name as error1, error2, error3 and erro4.

It's coming at swich case of OMAP_ECC_BCH16_CODE_HW but expected is OMAP_ECC_BCH8_CODE_HW.

I have modified  OMAP_ECC_BCH8_CODE_HW with #define CONFIG_NAND_OMAP_ECCSCHEME      OMAP_ECC_BCH8_CODE_HW_DETECTION_SW  in

include/configs/am335x_evm.h , but still facing same error

NAND:  nand: error4: insufficient OOB: require=106
0 MiB

Below is the omap_gpmc.c code for reference:

static int omap_select_ecc_scheme(struct nand_chip *nand,

enum omap_ecc ecc_scheme, unsigned int pagesize, unsigned int oobsize) {

struct omap_nand_info *info = nand->priv;

struct nand_ecclayout *ecclayout = &omap_ecclayout;

int eccsteps = pagesize / SECTOR_BYTES;

int i;

switch (ecc_scheme) {

// switch (OMAP_ECC_BCH8_CODE_HW) {

case OMAP_ECC_HAM1_CODE_SW:

debug("nand: selected OMAP_ECC_HAM1_CODE_SW\n");

/* For this ecc-scheme, ecc.bytes, ecc.layout, ... are

* initialized in nand_scan_tail(), so just set ecc.mode */

info->control = NULL;

nand->ecc.mode = NAND_ECC_SOFT;

nand->ecc.layout = NULL;

nand->ecc.size = 0;

break;

case OMAP_ECC_HAM1_CODE_HW:

debug("nand: selected OMAP_ECC_HAM1_CODE_HW\n");

/* check ecc-scheme requirements before updating ecc info */

if ((3 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {

printf("nand: error1: insufficient OOB: require=%d\n", (

(3 * eccsteps) + BADBLOCK_MARKER_LENGTH));

return -EINVAL;

}

info->control = NULL;

/* populate ecc specific fields */

memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl));

nand->ecc.mode = NAND_ECC_HW;

nand->ecc.strength = 1;

nand->ecc.size = SECTOR_BYTES;

nand->ecc.bytes = 3;

nand->ecc.hwctl = omap_enable_hwecc;

nand->ecc.correct = omap_correct_data;

nand->ecc.calculate = omap_calculate_ecc;

/* define ecc-layout */

ecclayout->eccbytes = nand->ecc.bytes * eccsteps;

for (i = 0; i < ecclayout->eccbytes; i++) {

if (nand->options & NAND_BUSWIDTH_16)

ecclayout->eccpos[i] = i + 2;

else

ecclayout->eccpos[i] = i + 1;

}

ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;

ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes -

BADBLOCK_MARKER_LENGTH;

break;

case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:

#ifdef CONFIG_BCH

debug("nand: selected OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");

/* check ecc-scheme requirements before updating ecc info */

if ((13 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {

printf("nand: error2: insufficient OOB: require=%d\n", (

(13 * eccsteps) + BADBLOCK_MARKER_LENGTH));

return -EINVAL;

}

/* check if BCH S/W library can be used for error detection */

info->control = init_bch(13, 8, 0x201b);

if (!info->control) {

printf("nand: error: could not init_bch()\n");

return -ENODEV;

}

/* populate ecc specific fields */

memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl));

nand->ecc.mode = NAND_ECC_HW;

nand->ecc.strength = 8;

nand->ecc.size = SECTOR_BYTES;

nand->ecc.bytes = 13;

nand->ecc.hwctl = omap_enable_hwecc;

nand->ecc.correct = omap_correct_data_bch_sw;

nand->ecc.calculate = omap_calculate_ecc;

/* define ecc-layout */

ecclayout->eccbytes = nand->ecc.bytes * eccsteps;

ecclayout->eccpos[0] = BADBLOCK_MARKER_LENGTH;

for (i = 1; i < ecclayout->eccbytes; i++) {

if (i % nand->ecc.bytes)

ecclayout->eccpos[i] =

ecclayout->eccpos[i - 1] + 1;

else

ecclayout->eccpos[i] =

ecclayout->eccpos[i - 1] + 2;

}

ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;

ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes -

BADBLOCK_MARKER_LENGTH;

break;

#else

printf("nand: error: CONFIG_BCH required for ECC\n");

return -EINVAL;

#endif

case OMAP_ECC_BCH8_CODE_HW:

#ifdef CONFIG_NAND_OMAP_ELM

debug("nand: selected OMAP_ECC_BCH8_CODE_HW\n");

/* check ecc-scheme requirements before updating ecc info */

if ((14 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {

printf("nand: error3: insufficient OOB: require=%d\n", (

(14 * eccsteps) + BADBLOCK_MARKER_LENGTH));

return -EINVAL;

}

/* intialize ELM for ECC error detection */

elm_init();

info->control = NULL;

/* populate ecc specific fields */

memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl));

nand->ecc.mode = NAND_ECC_HW;

nand->ecc.strength = 8;

nand->ecc.size = SECTOR_BYTES;

nand->ecc.bytes = 14;

nand->ecc.hwctl = omap_enable_hwecc;

nand->ecc.correct = omap_correct_data_bch;

nand->ecc.calculate = omap_calculate_ecc;

nand->ecc.read_page = omap_read_page_bch;

/* define ecc-layout */

ecclayout->eccbytes = nand->ecc.bytes * eccsteps;

for (i = 0; i < ecclayout->eccbytes; i++)

ecclayout->eccpos[i] = i + BADBLOCK_MARKER_LENGTH;

ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;

ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes -

BADBLOCK_MARKER_LENGTH;

break;

#else

printf("nand: error: CONFIG_NAND_OMAP_ELM required for ECC\n");

return -EINVAL;

#endif

case OMAP_ECC_BCH16_CODE_HW:

#ifdef CONFIG_NAND_OMAP_ELM

debug("nand: using OMAP_ECC_BCH16_CODE_HW\n");

/* check ecc-scheme requirements before updating ecc info */

if ((26 * eccsteps) + BADBLOCK_MARKER_LENGTH > oobsize) {

printf("nand: error4: insufficient OOB: require=%d\n", (

(26 * eccsteps) + BADBLOCK_MARKER_LENGTH));

return -EINVAL;

}

/* intialize ELM for ECC error detection */

elm_init();

/* populate ecc specific fields */

nand->ecc.mode = NAND_ECC_HW;

nand->ecc.size = SECTOR_BYTES;

nand->ecc.bytes = 26;

nand->ecc.strength = 16;

nand->ecc.hwctl = omap_enable_hwecc;

nand->ecc.correct = omap_correct_data_bch;

nand->ecc.calculate = omap_calculate_ecc;

nand->ecc.read_page = omap_read_page_bch;

/* define ecc-layout */

ecclayout->eccbytes = nand->ecc.bytes * eccsteps;

for (i = 0; i < ecclayout->eccbytes; i++)

ecclayout->eccpos[i] = i + BADBLOCK_MARKER_LENGTH;

ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH;

ecclayout->oobfree[0].length = oobsize - nand->ecc.bytes -

BADBLOCK_MARKER_LENGTH;

break;

#else

printf("nand: error: CONFIG_NAND_OMAP_ELM required for ECC\n");

return -EINVAL;

#endif

default:

debug("nand: error: ecc scheme not enabled or supported\n");

return -EINVAL;

}

/* nand_scan_tail() sets ham1 sw ecc; hw ecc layout is set by driver */

if (ecc_scheme != OMAP_ECC_HAM1_CODE_SW)

nand->ecc.layout = ecclayout;

info->ecc_scheme = ecc_scheme;

return 0;

}

Thanks and Regards

DEshvir Malik