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I have NAND flash memory dump, as a separate MTD partitions copied from NAND flash chip use built-in nanddump commands. I need to reflash some corrupted MTD partitions. In order to reflash partitions properly, should I use the partition dump that contain only the actual data, cleaned first from OOB data dummy chunks?

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This depends very much on how exactly you plan to write the data back; some options would accept only "payload", others may need OOB too.

If you use U-Boot's nand write, it seems it accepts data without OOB but you need to erase target pages manually first.

  • I used U-boot built-in commands nand erase and nand write. Before flashing I used python script to process dump and separate the actual data from OOB data. The test was unsuccessful, when I tried write data, an error was shown Attempt to write non page aligned data. 13548080 bytes written: ERROR. Before this I tried also write raw partition dump (with OOB), but linux kernel didn't loaded, not sure what was wrong with my dump. – minto Sep 16 at 19:37
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    @minto maybe this will help e2e.ti.com/support/legacy_forums/embedded/linux/f/354/t/… – Igor Skochinsky Sep 16 at 21:53
  • Cleaned dump is 13548080 bytes in size. NAND device have Block size 16384, page size 512, OOB size 16 bytes. 13548080 bytes is incomplete 26462 pages. A complete 26462 pages is 26462 x 512 = 13548544 bytes. The difference is 464 bytes: so need I append these 464 bytes for the complete page? – minto Sep 18 at 18:36
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It depends. For example Samsung XSR stores information about the blocks in spare area, thus you need to have to dump both data and spare.

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