linux-kernel - Re: [PATCH] ARM: BCM5301X: Fix NAND ECC parameters for Linksys Panamera

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Message-ID: <CACna6rzxXt-v=kwMHsBSmALDEJrN27OTRN9WAyPoc1FkjwxAhg@mail.gmail.com>
Date:   Sat, 28 Apr 2018 08:44:04 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Vivek Unune <npcomplete13@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Jon Mason <jonmason@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: BCM5301X: Fix NAND ECC parameters for Linksys Panamera

On 28 April 2018 at 06:19, Vivek Unune <npcomplete13@...il.com> wrote:
> On Fri, Apr 27, 2018 at 10:05 AM, Vivek Unune <npcomplete13@...il.com> wrote:
>> On Wed, Apr 25, 2018 at 11:02:04AM +0200, Rafał Miłecki wrote:
>>>
>>> The easiest solution: ignore all these "error -74 (ECC error) while
>>> reading" errors (they may last for few minutes!). I believe UBI should
>>> simply recreate all pages it couldn't access and once you wait long
>>> enough, all your NAND flash will be using BCH8.
>>
>> Let me build the firmware with BCH-8 and wait it out. I'll report back my
>> results.
>
> I can confirm that BCH-8 indeed works after letting it run through those
> ECC errors.
>
> Thanks!

Great, thanks! That controller behavior (reading BCH8 fine while
working in BCH4 mode) is really confusing.

-- 
Rafał