reading ubi from a NAND for programming to other devices
lukma at denx.de
Fri Jan 26 01:24:13 PST 2018
> 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).
> 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,
> U-Boot mailing list
> U-Boot at lists.denx.de
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