Re: [PATCH] ARM: dts: imx6ull: fix ubi mount failed on MYS-6ULX-IOT board

[Sascha Hauer]

On Tue, Mar 09, 2021 at 02:15:19PM +0800, dillon.minfei@xxxxxxxxx wrote:
> From: dillon min <dillon.minfei@xxxxxxxxx>
> 
> This patch intend to fix ubi filesystem mount failed on MYS-6ULX-IOT board,
> from Micron MT29F2G08ABAEAWP's datasheets, we need to choose 4-bit ECC.
> 
> Table 18: Error Management Details
> 
> Description					Requirement
> 
> Minimum number of valid blocks (NVB) per LUN	2008
> Total available blocks per LUN			2048
> First spare area location			x8: byte 2048 x16: word 1024
> Bad-block mark					x8: 00h x16: 0000h
> Minimum required ECC				4-bit ECC per 528 bytes
> Minimum ECC with internal ECC enabled		4-bit ECC per 516 bytes (user data) + 8
> 						bytes (parity data)
> Minimum required ECC for block 0 if PROGRAM/
> ERASE cycles are less than 1000			1-bit ECC per 528 bytes

4-bit ECC is the minimum this chip requires. There's nothing wrong with
choosing a better ECC like the GPMI driver does by default.

It looks like you are papering over some other problem.

Sascha

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