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

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Message-ID: <20210309121836.GU4207@pengutronix.de>
Date:   Tue, 9 Mar 2021 13:18:36 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     dillon.minfei@...il.com
Cc:     robh+dt@...nel.org, shawnguo@...nel.org, parthiban@...umiz.com,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: imx6ull: fix ubi mount failed on MYS-6ULX-IOT
 board

On Tue, Mar 09, 2021 at 02:15:19PM +0800, dillon.minfei@...il.com wrote:
> From: dillon min <dillon.minfei@...il.com>
> 
> 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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