[U-Boot] [U-boot] Is there generic code to detect nand chip's ecc bits?

[Scott Wood]

On Thu, 2014-04-17 at 18:19 +0800, TigerLiu at via-alliance.com wrote:
> Hi, Scott:
> 
> I have a question about nand chip’s ecc bits:
> 
> Nand chip usually declared its ecc bits for each 512 bytes in its data
> sheet.
> 
> Such as:
> 
> Some nand chips required 4bit ECC for each 512 bytes.
> 
> Some nand chips required 2bit ECC for each 512 bytes.
> 
>  
> 
> So, my question is:
> 
> Could ecc bits be got from nand chip’s flash id?
> 
> Or other generic method to retrieve ECC bits required for every nand
> chip?

I believe the ONFI data has this information.  For chips/controllers
that don't support ONFI, you'd have to deal with vendor specific
extended ID encoding (if the information is there at all).

-Scott