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kernel panic mounting filesystem from NAND

trichet christophe
Expert 2025 points
Other Parts Discussed in Thread: AM3352

Hello

i programmed my filesytem.tar.gz in NAND but when i boot from NAND AM3352:

U-Boot# fatload mmc 0 0x84000000 targetNFS74M140623.tar.gz
U-Boot# nand write 0x84000000 0x00600000 0x20D1494

But i can't mount the filesystem :

VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0)
[    2.631317] Please append a correct "root=" boot option; here are the available partitions:  

[    2.639892] Kernel panic - not syncing: VFS: Unable to mount root fs on unkno
wn-block(0,0)                                                                   
[    2.648315] Backtrace:                                                       
[    2.650848] [<c0017978>] (dump_backtrace+0x0/0x110) from [<c0421438>] (dump_s
tack+0x18/0x1c)                                                                 

1)Have you any idea where the problem is ?

2)is there in linux configuration to change ?

My env variable ubi is : (NAND of 2048 bytes / page) : nandroot=ubi0:rootfs rw ubi.mtd=7,2048

regards

  • 0
    TI__Mastermind 25235 points

    Hi,

    You have to write a NAND flash file system (most commonly UBIFS) to the NAND flash, not a tar.gz archive as this won't work.

    You can read all about it here: http://processors.wiki.ti.com/index.php/UBIFS_Support

    Best regards,
    Miroslav

  • 0 in reply to Miroslav Kiradzhiyski XID
    Expert 2025 points

    Hello

    thanks for the link

    I have the MT29F1G08ABAEAW NAND, with 2048 page size so i did :

    mkfs.ubifs /home/pengwyn/ti-sdk-am335x-evm-05.06.00.00/targetNFS –F -m 2048 -e 129024 -c 2047 -o ubifs.img
    the result is a file of 1.7Mb for a file system of 74,6Mb.
    1° Is it normal ?
    2° I don't understand what i should put in the -e  and -c parameters, can you help me ?

    regards

  • 0 in reply to Miroslav Kiradzhiyski XID
    Expert 2025 points

    Hello

    when i do the mtdinfo on linux i got the following answer

    mtdinfo -a                                                   
    Count of MTD devices:           0

    is it normal ? can i have a ubifs system however ?

    regards

  • 0 in reply to Miroslav Kiradzhiyski XID
    Expert 2025 points

    Hello

    I still have trouble !!! can you help me please?
    For the MT29F1G08ABAEAW NAND :

    page=2048b
    block erase=128K
    total size=1G

    I did on linux :
    sudo mkfs.ubifs /home/pengwyn/ti-sdk-am335x-evm-05.06.00.00/targetNFS –F –v -m 2048 -e 126976 -c 8406 -o ubifs.img
    sudo ubinize -o ubi.img -m 2048 -p 128KiB -s 2048 ubinize.cfg


     I did on target :

    mw.b 0x84000000 0xFF 0x500000 
    mmc rescan
    fatload mmc 0 0x84000000 ubi.img
    nand erase 0x00600000 0x500000
    nand write 0x84000000 0x00600000 0x200000
     
     setenv bootargs 'console=ttyO0,115200n8 noinitrd ip=off mem=1024M rootwait=1 rw ubi.mtd=7,2048 rootfstype=ubifs root=ubi0:rootfs init=/init'
     boot
    It still can't be mounted : 

        2.623931] VFS: Cannot open root device "ubi0:rootfs" or unknown-block(0,0) 
    [    2.631134] Please append a correct "root=" boot option; here are the availab
    le partitions:                                                                  
    [    2.639709] Kernel panic - not syncing: VFS: Unable to mount root fs on unkno
    wn-block(0,0)                                                                   
    [    2.648132] Backtrace:                                                       
    [    2.650665] [<c0017978>] (dump_backtrace+0x0/0x110) from [<c0421438>] (dump_s


    regards

  • 0 in reply to Miroslav Kiradzhiyski XID
    Expert 2025 points

    Hello

    can my problem be related to this error ?

    root@am335x-evm:~# ubiattach /dev/ubi_ctrl -m 7 -O 2048                         
    ubiattach: error!: cannot attach mtd7                                           
               error 19 (No such device)

    regards

  • 0 in reply to trichet christophe
    TI__Mastermind 25235 points

    Trichet,

    I have provided an answer to some of your questions in your Linux forum threads.

    Regarding the missing mtd devices - Please check if you have enabled MTD support in the linux kernel. Also if you have the appropriate mtd_partitions table inside your board config file.

    Best regards,
    Miroslav

  • 0 in reply to trichet christophe
    Expert 2785 points

    Hi,

    I am also facing the error in my am335x custom board. But i am using 1GB RAM. I got the below error. 

    root@am335x-evm:/media/card# ubiattach /dev/ubi_ctrl -m 7 -O 4096
    ubiattach: error!: cannot attach mtd7
    error 28 (No space left on device)

    Did you solve the issue, Please help me what is the problem?. I am referring ti sdk6 with Linux 3.2.

    Regards,

    Lofna