"Kernel panic" in loading and devtmpfs mounting error into craneboard(am3517_crane)

Question

I've compiled inserted MLO and uboot.img file into MMC card and now trying to load "rootfs".there is problem in loading.Following are lines at the end of LOG..:

kjournald starting. Commit interval 5 seconds

EXT3-fs (mmcblk0p2): using internal journal

EXT3-fs (mmcblk0p2): recovery complete

EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode

VFS: Mounted root (ext3 filesystem) on device 179:2.

devtmpfs: error mounting -2

Freeing init memory: 164K

Kernel panic - not syncing: No init found. Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.

output of printenv is:

AM3517_CRANE # printenv

baudrate=115200

bootargs=console=ttyO2,115200n8 omapfb.vram=0:4M,1:4M omapfb.mode=dvi:1280x800MR-32@60 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait fixrtc nohlt

bootcmd=mmc dev ${mmcdev}; if mmc rescan; then echo mmc detected; if run loadbootscript; then echo Load bootscript; run bootscript; saveenv; fi; echo SD/MMC found on device ${mmcdev}; if run loaduimage; then run mmcboot; else run nandboot; fi; else run nandboot; fi

bootdelay=5

bootfile=uImage

bootscript=echo Running bootscript from mmc ...; source ${loadaddr}

console=ttyO2,115200n8

dieid#=4294000100000000015da3960401c020

ethact=DaVinci-EMAC

ethaddr=00:E0:4C:53:44:58

filesize=394

ipaddr=123.12.0.3

loadaddr=0x82000000

loadbootscript=fatload mmc ${mmcdev} ${loadaddr} boot.scr

loaduimage=fatload mmc ${mmcdev} ${loadaddr} uImage

mmcargs=setenv bootargs console=ttyO2 omapfb.vram=0:4M,1:4M omapfb.mode=dvi:1280x800MR-32@60

root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait fixrtc nohlt

mmcboot=echo Booting from mmc ...; run mmcargs; bootm ${loadaddr}

mmcdev=0

nandargs=setenv bootargs console=${console} root=/dev/mtdblock4 rw rootfstype=jffs2

nandboot=echo Booting from nand ...; run nandargs; nand read ${loadaddr} 280000 400000; bootm ${loadaddr}

serverip=123.12.0.2

stderr=serial

stdin=serial

stdout=serial

Environment size: 1249/131068 bytes

Is problem related to rootfs or uboot or environment variables?

Answer 1

I think this error come due to not having rootfs in ext3 partition.Check your root(EXT3) partition of sd-card whether rootfs is available or not?

Answer 2

In particular, AFAIK the line devtmpfs: error mounting -2 indicates that there isn't devtmpfs mounting point present in the root partition. That means it is sufficient to run the command cd <future_rootfs_mounting_point> && sudo mkdir dev to cease this error message.

(I assume there are CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT kernel options enabled.)

I decided to write about this as it may happen that you even have a partition marked as rootfs, but it doesn't have proper internal configuration.