Creating UBIFS

Hi,

Can you try the same command using "sudo" in front of it?

Best regards,
Miroslav

hi... i tried yours but then also same error..

now iam getting the new error like "failed to open the file /......../sbin/mount.nfs

Did you get both errors with the sudo command or did you do something different to get the second error?

What command caused the second error?

Best regards,
Miroslav

Hi.. i tried different command and i got that error.  Actually i was creating the ubifs.img in the same direcory where i have installed the rootfs. Now i created a new directory and i gave the path to the new directory.

I am able to create the ubifs.img in the destnation, but with the error saying " 

"failed to open the file /srikanta/ezsdk/ti-ezsdk_dm816x-evm_5_05_02_00/filesystem/target_fs_ubifs/sbin/mount.nfs"

Please check if this file exists and also check it's permissions and owner.

Best regards,
Miroslav

hi..

i checked that file exists,  and in the permissions it t is like   Owner: root   access: read only.   

                                                                                                            Owner: group  access:no access

                                                                                                            Owner:others  access:no access

you tell me one more thing, what is the volume size i need to give in ubifs.cfg file

 -m 4096 -e 512KiB -c 2048  and also   

image=ubifs.img       <== Source image
vol_id=0 <== Volume ID in UBI image
vol_size=----( <== Volume size????????????????????????????
vol_type=dynamic <== Allow for dynamic resize
vol_name=rootfs <== Volume name
vol_flags=autoresize

Hi..  Miroslav

thank you verry much for the reply,  i followed that link and i got what to write in the ubifs.cfg.

I need one more clarification from you can you please verify, what i have calculated is right or not???

I am using MT29F16G08ABACAWP  NAND flash chip, with the following parameter in the datasheet.

SLC NAND flash

Page size x8: 4320 bytes (4096 + 224 bytes)
– Block size: 128 pages (512K + 28K bytes)
– Plane size: 2 planes x 2048 blocks per plane
– Device size: 16Gb: 4096 blocks;
32Gb: 8192 blocks; 64Gb: 16,384 block

-m 4096

-e 512KiB

-c 4075

i.e.... SP   PEB SIZE   =  512KiB

         SL  LEB SIZE    = SP- 2*2KiB =512-4= 508kiB

         P  Total number of PEBs on the MTD device  = 2GiB / 512 kiB = 4096

         B Number of PEBs reserved for bad PEB handling       1% of P   41

        O  The overhead related to storing EC and VID headers in bytes  =SP -SL =4KiB

UBI overhead  =  (B+4)*SP+O*(P-B-4)  =  (41+4)*512KiB+4kiB(4096-41-4) = 53

 this leaves withP-53=4096-53= 4043  PEB's or 2070016KiB

2070016/ SL = 4075   ( -c)

volume size 2070016kiB (2021MiB)

please let me know if i have done any mistake or if i have taken any wrong value from the flash datasheet.

i will be waiting for your reply.

Regards

Srikanta

Hi,

The LEB size (SL) is the PEB size minus 2 min. I/O units for overhead = 512K - 2*4K = 504KB

-e should be the LEB size in bytes, so 504*1024 = 516096

Then the overhead (O = SP-SL) becomes 8KB

And once you have these you can recalculate the UBI overhead.

Best regards,
Miroslav