linux-kernel - Re: [PATCH v3 0/2] nvmem: brcm_nvram: use buffered nvram data for cell values

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Message-ID: <dca5d799-a562-4494-bbf4-79b7e9420cac@arinc9.com>
Date:   Tue, 7 Feb 2023 11:50:23 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Willem-Jan de Hoog <wdehoog@...londelft.nl>,
        Rafał Miłecki <zajec5@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     Rafał Miłecki <rafal@...ecki.pl>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] nvmem: brcm_nvram: use buffered nvram data for
 cell values

On 7.02.2023 11:42, Willem-Jan de Hoog wrote:
> On OpenWrt 22.03.3, Asus RT-AC88U does not boot anymore:
> 
>    UBI: auto-attach mtd4
>    ubi0: attaching mtd4
>    ubi0 error: 0xc04f0b3c: PEB 0 contains corrupted VID header, and the
>       data does not contain all 0xFF
>    ubi0 error: 0xc04f0b4c: this may be a non-UBI PEB or a severe VID
>       header corruption which requires manual inspection
> 
> The problem seems to be that brcm_nvram_read accesses its (mapped) io
> memory. When doing so the correct data is read but after that the
> mtd/ubi process fails to work.
> 
> The bcm47xx_nvram.c code has buffered the nvram data so the cells value
> can be read from there.
> 
> v3:
> - Export symbol for modules.
> - No dependency on Kconfig.
> 
> v2:
> - Fix the wrong author information.
> 
> v1:
> - arinc.unal: Improved patch subject and log
> 
> Willem-Jan de Hoog (2):
>    The bcm47xx code makes a copy of the NVRAM data in ram. Allow access
>      to this data so property values can be read using nvmem cell api.
>    The bcm47xx module has a copy of the NVRAM data in ram. When available
>      use this one instead of reading from io memory since it causes
>      mtd/ubi to fail.

I believe you're supposed to put the subject of the patches here, keep 
that in mind for future contributions. No need to resubmit as this is 
just composition.

Arınç