Please append a correct "root=" boot option

[sai krishna sai]

Hi,

  I am using versatile PB FPGA by ARM, and i am trying to make one partition on flash (NOR intel 64Mb) for jffs2 file system.

I am trying to do(partitioning n making of jffs2) that by using a file versatile.c which is kept in drivers/mtd/maps/ directory.

see the partitioning below as per the file,


#define WINDOW_ADDR 0x34000000
#define WINDOW_SIZE 0x04000000
#define BUSWIDTH    1


static struct mtd_info *mymtd;


struct map_info physmap_map = {
        .name = "versatile_flash",
        .size = WINDOW_SIZE,
        .phys = WINDOW_ADDR,
        .bankwidth = BUSWIDTH
};

#ifdef CONFIG_MTD_PARTITIONS
static struct mtd_partition *mtd_parts;
static int                  mtd_parts_nb;

//#define FLASH_BLOCK_SIZE 0x20000

static struct mtd_partition physmap_partitions[] = {
/* Partition information for versatile flash */
        {
          .name =              "Boot monitor", /* 256K boot loader */
                .size =        2*FLASH_BLOCK_SIZE,
                .offset =      0,
                .mask_flags =  MTD_WRITEABLE,  /* force read-only */
        }, {
          .name =              "u-boot", /* 128K enviroment */
                .size =        2*FLASH_BLOCK_SIZE,
                .offset =      MTDPART_OFS_APPEND,
        }, {
.name =              "bZimage",      /* kernel image */
                .size =        18*FLASH_BLOCK_SIZE,
                .offset =      MTDPART_OFS_APPEND,
                .mask_flags =  MTD_WRITEABLE,  /* force read-only */
        }
        ,{
          .name =              "UserFStst",    /* cramfs for testing */
          .size =              152*FLASH_BLOCK_SIZE,
          .offset =            MTDPART_OFS_APPEND,
        }
        ,{
          .name =              "NFU",    /* NFU for loading images */
          .size =              2*FLASH_BLOCK_SIZE,
          .offset =            MTDPART_OFS_APPEND,
        }
        , {
          .name =              "UserFS",    /* jffs2 until end */
                .size =        MTDPART_SIZ_FULL,
                .offset =      MTDPART_OFS_APPEND,
              // .mask_flags =  MTD_WRITEABLE, /* May be need or need not */
        }
};

#define NUM_PARTITIONS  (sizeof(physmap_partitions)/sizeof(struct mtd_partition))
const char *part_probes[] = {"cmdlinepart", NULL};






i am making the partitions like above and giving the bootargs as

  setenv bootargs root=/dev/mtdblock5 rw rootfstype=jffs2 console=ttyAMA0,38400n8 mem=128M

  mtdblock5 is for jffs2 binary.

Here is the part of .config




# Memory Technology Devices (MTD)
#
CONFIG_MTD=y
# CONFIG_MTD_DEBUG is not set
# CONFIG_MTD_CONCAT is not set
CONFIG_MTD_PARTITIONS=y

# User Modules And Translation Layers
#
CONFIG_MTD_CHAR=y
CONFIG_MTD_BLOCK=y
# CONFIG_FTL is not set
# CONFIG_NFTL is not set
# CONFIG_INFTL is not set

# RAM/ROM/Flash chip drivers
#
CONFIG_MTD_CFI=y
# CONFIG_MTD_JEDECPROBE is not set
CONFIG_MTD_GEN_PROBE=y
CONFIG_MTD_CFI_ADV_OPTIONS=y
CONFIG_MTD_CFI_NOSWAP=y
# CONFIG_MTD_CFI_BE_BYTE_SWAP is not set
# CONFIG_MTD_CFI_LE_BYTE_SWAP is not set
# CONFIG_MTD_CFI_GEOMETRY is not set
CONFIG_MTD_MAP_BANK_WIDTH_1=y
CONFIG_MTD_MAP_BANK_WIDTH_2=y
CONFIG_MTD_MAP_BANK_WIDTH_4=y
# CONFIG_MTD_MAP_BANK_WIDTH_8 is not set
# CONFIG_MTD_MAP_BANK_WIDTH_16 is not set
# CONFIG_MTD_MAP_BANK_WIDTH_32 is not set
CONFIG_MTD_CFI_I1=y
CONFIG_MTD_CFI_I2=y
# CONFIG_MTD_CFI_I4 is not set
# CONFIG_MTD_CFI_I8 is not set
CONFIG_MTD_CFI_INTELEXT=y
# CONFIG_MTD_CFI_AMDSTD is not set
# CONFIG_MTD_CFI_STAA is not set
CONFIG_MTD_CFI_UTIL=y
# CONFIG_MTD_RAM is not set
CONFIG_MTD_ROM=y
# CONFIG_MTD_ABSENT is not set
# CONFIG_MTD_XIP is not set

#
# Mapping drivers for chip access
#
CONFIG_MTD_COMPLEX_MAPPINGS=y
# CONFIG_MTD_PHYSMAP is not set
# CONFIG_MTD_ARM_INTEGRATOR is not set
CONFIG_MTD_ARM_VERSATILE=y
# CONFIG_MTD_EDB7312 is not set
# CONFIG_MTD_PCI is not set

# Miscellaneous filesystems
#
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_HFSPLUS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_JFFS_FS is not set
CONFIG_JFFS2_FS=y
CONFIG_JFFS2_FS_DEBUG=0
# CONFIG_JFFS2_FS_NAND is not set
# CONFIG_JFFS2_FS_NOR_ECC is not set
# CONFIG_JFFS2_COMPRESSION_OPTIONS is not set
CONFIG_JFFS2_ZLIB=y
CONFIG_JFFS2_RTIME=y
# CONFIG_JFFS2_RUBIN is not set
CONFIG_CRAMFS=y
# CONFIG_VXFS_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set

#
# Partition Types
#
CONFIG_PARTITION_ADVANCED=y
# CONFIG_ACORN_PARTITION is not set







When i boot the board the following messages are coming.

jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x009e0020: 0xffff in stead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x009e0024: 0xffff in stead
Further such events for this erase block will not be printed
Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes
empty_blocks 0, bad_blocks 0, c->nr_blocks 80
VFS: Cannot open root device "mtdblock5" or unknown-block(31,5)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,5)



jffs2_scan_eraseblock() can be avoided by padding the flash,
but why it is not able to open/detect the mtdblock5, i dont know?

can any one plz help to mount jffs2 in this case,

am i doing any partitioning mistakes or root option mistakes?

Thanks in advance,

Thanks & Regards,
Saikrishna Gajula
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