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AM335x 8bit NAND and SDK 06 UBIFS boot problem

Dimitrije Dinic
Prodigy 100 points

Hi everyone..

First of all i have to point out, my knowledge about UBI file systems and kernel booting internlas, is very limited. I also spent significant time searching this forum.

I have custom AM335X board with 8bit NAND MT29F2G08ABAEAH4-IT:E device. Also i ported SPL/U-Boot and Linux kernel  form SDK 06.00.00.00/board-support/board-port-labs source trees. After few startup problems now i have SPL, U-Boot and kernel booting from NAND flash. Of course kernel will crash upon unsuccessful root file system probe...

In order to save some development time, i tried to use already pre-built UBI file system image, used for am335X-evm boards, and found in SDK 06.00.00.00/filesystem/arago-base-tisdk-image-am335x-evm.ubi.

The idea was simple, as supplied in here:

  •  bootargs=console=ttyO0,115200n8 noinitrd ip=off mem=128M rootdelay=5 rw ubi.mtd=7,2048 rootfstype=ubifs root=ubi0:am335x-evm-rootfs
But kernel crashes and spits this message:

13.953002] Waiting 5sec before mounting root device...
[ 25.074035] UBIFS: recovery needed
[ 25.506988] UBIFS: recovery completed
[ 25.531127] UBIFS: mounted UBI device 0, volume 0, name "am335x-evm-rootfs"
[ 25.576812] UBIFS: file system size: 30347264 bytes (29636 KiB, 28 MiB, 239 LEBs)
[ 25.626922] UBIFS: journal size: 9023488 bytes (8812 KiB, 8 MiB, 72 LEBs)
[ 25.674713] UBIFS: media format: w4/r0 (latest is w4/r0)
[ 25.712860] UBIFS: default compressor: lzo
[ 25.739715] UBIFS: reserved for root: 0 bytes (0 KiB)
[ 25.807769] VFS: Mounted root (ubifs filesystem) on device 0:12.
[ 25.853485] Freeing init memory: 236K
[ 27.124603] UBIFS error (pid 1): ubifs_read_node: bad node type (255 but expected 1)
[ 27.175537] UBIFS error (pid 1): ubifs_read_node: bad node at LEB 22:29952, LEB mapping status 1
[ 27.233001] UBIFS error (pid 1): do_readpage: cannot read page 87 of inode 716, error -22
[ 27.319305] UBIFS error (pid 1): ubifs_read_node: bad node type (255 but expected 1)
[ 27.370117] UBIFS error (pid 1): ubifs_read_node: bad node at LEB 22:29952, LEB mapping status 1
[ 27.427551] UBIFS error (pid 1): do_readpage: cannot read page 87 of inode 716, error -22
[ 27.486145] Kernel panic - not syncing: Attempted to kill init!
[ 27.525115] Backtrace:

Now i have few simple questions:

Can I expect this pre-built file system to work 'out of the box' or with some small intervention?

Or do i need to create custom one, having in mind this tutorial, to adjust NAND flash parameters.?

Can i use arago-base-tisdk-image-am335x-evm.tar.gz as base file system, to compile my custom one, regarding the fact that i can not find any init folder or scripts, and i guess init script should be supplied with bootargs? 

Thanks in advance

  • 0
    TI__Mastermind 25235 points

    Hi,

    I believe the provided pre-built UBI file system in the SDK is prepared for the NAND chips used in the official TI evaluation boards. Since you are using a different NAND flash device, you will have to build a UBIFS image taking into account the NAND chip characteristics like PEB size, LEB size, etc.

    Turorials and examples can be found here:

    http://processors.wiki.ti.com/index.php/UBIFS_Support
    http://www.linux-mtd.infradead.org/faq/ubifs.html#L_mkfubifs

    You can also take a look at this step-by-step example I have provided here: http://e2e.ti.com/support/arm/sitara_arm/f/791/p/268305/941327.aspx#941327

    Please not that the parameters in my example vary since it is an attempt for a dual boot system.

    Best regards,
    Miroslav

  • 0 in reply to Miroslav Kiradzhiyski XID
    Prodigy 100 points

    Thanks for assistance Miroslav,

    now the situation is like this:

    1) my NAND device is MT29F2G08ABAEAH4-IT:E, 2048 page size, 128KB block size

    2) I followed links you provided, and used base file system form SDK, arago-base-tisdk-image-am335x-evm.tar.gz. Commands for UBIFS file creation (of course mtd-utils were present on my host):

    • mkfs.ubifs -r rootfs/ -F -o ubifs.img -m 2048 -e 126976 -c 242
    • ubinize -o hM01-CPUXX-ubi.img -m 2048 -p 128KiB -O 2048 ubinize.cfg

    (followed by the calculations required, and by kernel mtd partition structure, i decided to use 32MB size, (256 PEBS) and 14 PEBS as UBIFS overhead. This leads to 242.)

    ubunize.cfg contents:

    [ubifs]
    mode=ubi
    image=ubifs.img
    vol_id=0
    vol_size=30MiB
    vol_type=dynamic
    vol_name=rootfs

    Now finally, kernel can recognize file system, and i got following error log, which seems a bit unexpected for me:

     

    [ 13.772583] Waiting 5sec before mounting root device...
    [ 21.098663] UBIFS: recovery needed
    [ 22.153076] UBIFS: recovery completed
    [ 22.177246] UBIFS: mounted UBI device 0, volume 0, name "rootfs"
    [ 22.216796] UBIFS: file system size: 29458432 bytes (28768 KiB, 28 MiB, 232 LEBs)
    [ 22.267028] UBIFS: journal size: 4190208 bytes (4092 KiB, 3 MiB, 33 LEBs)
    [ 22.314849] UBIFS: media format: w4/r0 (latest is w4/r0)
    [ 22.352905] UBIFS: default compressor: lzo
    [ 22.379791] UBIFS: reserved for root: 0 bytes (0 KiB)
    [ 22.447784] VFS: Mounted root (ubifs filesystem) on device 0:12.
    [ 22.492919] Freeing init memory: 212K
    INIT: version 2.88 booting
    [ 25.289520] UBIFS error (pid 812): ubifs_decompress: cannot decompress 3156 bytes, compressor lzo, error -22
    [ 25.354095] UBIFS error (pid 812): read_block: bad data node (block 179, inode 3241)
    [ 25.404815] UBIFS error (pid 812): do_readpage: cannot read page 179 of inode 3241, error -22
    [ 25.477416] UBIFS error (pid 812): ubifs_decompress: cannot decompress 3156 bytes, compressor lzo, error -22
    [ 25.541839] UBIFS error (pid 812): read_block: bad data node (block 179, inode 3241)
    [ 25.592437] UBIFS error (pid 812): do_readpage: cannot read page 179 of inode 3241, error -22
    [ 25.688262] UBIFS error (pid 1): ubifs_decompress: cannot decompress 3156 bytes, compressor lzo, error -22
    [ 25.751800] UBIFS error (pid 1): read_block: bad data node (block 179, inode 3241)
    [ 25.801330] UBIFS error (pid 1): do_readpage: cannot read page 179 of inode 3241, error -22
    [ 25.859008] Kernel panic - not syncing: Attempted to kill init!
    [ 25.897979] Backtrace:

    So far, seem like Linux have tried to start some etc/rcS.d init scripts, but UBI layer failed to manage underlying mtd structure. 

    Any ideas for this behavior?

    Thanks in advance