Hi Tim, > Greetings, > > I'm looking to understand what methods are available for > reading/writing ubi/ubifs from an existing NAND flash in order to > duplicate the contents onto another device in U-Boot, Linux, and with > JTAG flashing for production.
You may want to check if nanddump / nandwrite will work for you (but those are Linux utils, not available in u-boot). http://git.infradead.org/mtd-utils.git/tree/HEAD:/nand-utils > > Typically I create ubi's using ubinize then I can use U-Boot 'nand > erase' and 'nand write' or JTAG to write the ubi without issues. > However if I use U-Boot 'nand read' to read a ubi then write it back > using the same method I get 'ubi0 warning: ubi_io_read: error -74 (ECC > error)' and 'ubi0 error: ubi_io_read: error -74 (ECC error)' messages > from Linux when its mounted. I find I run into the same problem when > JTAG programming ubi's: no issues when using a ubi created via ubinize > but when flashing one that came from a U-Boot 'nand read' I see ubi > errors when mounting it. > > Some testing shows me that I can't use U-Boot nand read/erase/write > once U-Boot has 'attached' the UBI (via the U-Boot 'ubi part' command) > which scans and re-sizes the volume. > > If I on the other hand take a ubi from U-Boot 'nand read' and use > Linux ubiformat to flash that onto a new device I get no ubi > warnings/errors when its mounted. My understanding is that ubiformat > is simply preserving erase counters but there must be something else > its doing. > > What's going on here and what can I do in U-Boot/JTAG to properly > write ubi that's been read from an existing system? I'm hoping there > is a method that doesn't require iterating over the individual volumes > within the ubi. > > Best Regards, > > Tim > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > https://lists.denx.de/listinfo/u-boot Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
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