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Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

Myosotis
Intellectual 510 points

Hello! 

My device is TDM-3730W. 

I installed prebuilt filesystem and uImage from DVSDK (dvsdk_dm3730-evm_04_03_00_06_setuplinux) on SD card (2GB Micro Transcend Card). 

But Linux doesn't mount. I have got the error 

[    5.358489] VFS: Cannot open root device "b302" or unknown-block(179,2) 
[    5.365447] Please append a correct "root=" boot option; here are the available partitions: 
[    5.374237] 1f00             512 mtdblock0  (driver?) 
[    5.379547] 1f01            1280 mtdblock1  (driver?) 
[    5.384826] 1f02             768 mtdblock2  (driver?) 
[    5.390136] 1f03            5120 mtdblock3  (driver?) 
[    5.395446] 1f04          516608 mtdblock4  (driver?) 
[    5.400726] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

Then I recompiled kernel (only kernel, not rootfs) with different defconfig options 

sudo make omap3_evm_defconfig ARCH=arm CROSS_COMPILE=$myPATH/arm-none-linux-gnueabi-

Also I tried omap3_beagle_defconfig and davinci_all_defconfig.

Nothing helps! Wouldn't you help me please?

Thank you for attention. 

  • 0
    TI__Intellectual 1195 points

    Check 'bootargs' environment variable setting in uboot. You need to pass the filesystem type and location to the kernel using the bootargs variable.

    For example, if your rootfs resides on the second partition of your SD card, then you need to tell the kernel about it by adding the following information "root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait" to the bootargs env variable.

    I suggest you check the Linux User Guide for your SDK.

    Carlos

  • 0 in reply to Carlos Hernandez
    Intellectual 510 points

    Thank you, Carlos Hernandez 

    I already did it but it didn't help. 

    [    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait omap_vout.vid1_static_vrfb_alloc=y

    And I got error 

    [    4.189239] Waiting for root device /dev/mmcblk0p2...
[    4.229125] mmc0: new high speed SD card at address e624
[    4.235809] mmcblk0: mmc0:e624 SU02G 1.84 GiB (ro)
[    4.250549]  mmcblk0: p1 p2
[    4.326934] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2)
[    4.334350] Please append a correct "root=" boot option; here are the available partitions:
[    4.343170] 1f00             512 mtdblock0  (driver?)
[    4.348754] 1f01            1280 mtdblock1  (driver?)
[    4.354064] 1f02             768 mtdblock2  (driver?)
[    4.359375] 1f03            5120 mtdblock3  (driver?)
[    4.364685] 1f04          516608 mtdblock4  (driver?)
[    4.369995] b300         1931264 mmcblk0  driver: mmcblk
[    4.375549]   b301           48163 mmcblk0p1 00000000-0000-0000-0000-000000000mmcblk0p1
[    4.383972]   b302         1879605 mmcblk0p2 00000000-0000-0000-0000-000000000mmcblk0p2
  • 0 in reply to Myosotis
    Intellectual 510 points

    I noticed that MLO-dm37x-evm and u-boot-dm37x-evm from DVSDK's (4) prebuilt-images directory are not supported by my board (TDM-3730W)

    Why so? I have made bootable SD card, but u-boot doesn't start 

    May be it is the reason of troubles with mounting? 

  • 0 in reply to Myosotis
    Genius 3925 points

    I saw it in this post:

    http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/t/136589.aspx

    try another SD card

  • 0 in reply to Hongfeng Wang
    Intellectual 510 points

    Hongfeng Wang, 

    I worked with three SD cards.

    I will be grateful for any useful suggestions (only not "bye another board" :))

  • 0 in reply to Myosotis
    Genius 3925 points

    Where did you mention you already tried 3 cards in your original post?
    You are really nice to people who are trying to help you. good luck.

  • 0 in reply to Myosotis
    Guru 26430 points

    The 2GB size can be a problem with older card readers. Maybe try a 1GB card or 4GB card. The 2GB card requires a MBR with the proper size. You might have erased that MBR by accident.

    The boot log shows the cards as "(ro)" or read-only, The file system needs to be writeable. Check the lock switch in the card. Check your board's card socket for the r/w signal.