I have a few projects that are using high density Hynix NAND chips that are returning many errors when read..
I'm trying to figure out how to implement read retry on them but I can't find any datasheet that mentions it..

I did find this uncommitted patch but I don't understand the process..
https://lkml.org/lkml/2014/2/24/431

I don't understand the significance to setting NAND_CMD_NONE w/ a column value.
or why they're reading a data structure from the NAND chip and writing specific bytes from that structure back to it depending on the retry_mode.
Seems like Micron's method is much easier..

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I can't help much, but if you wanna do this make sure you are running in sudo otherwise you will get .ioperm error.

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