linux-kernel - Re: [PATCH] mtd: rawnand: Do not check for bad block if bbt is unavailable

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Date:   Wed, 03 Feb 2021 16:22:42 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Boris Brezillon <boris.brezillon@...labora.com>
CC:     Miquel Raynal <miquel.raynal@...tlin.com>, richard@....at,
        vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org
Subject: Re: [PATCH] mtd: rawnand: Do not check for bad block if bbt is unavailable



On 3 February 2021 3:49:14 PM IST, Boris Brezillon <boris.brezillon@...labora.com> wrote:
>On Wed, 03 Feb 2021 15:42:02 +0530
>Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> wrote:
>
>> >> 
>> >> I got more information from the vendor, Telit. The access to the
>3rd  
>> >partition is protected by Trustzone and any access in non privileged
>> >mode (where Linux kernel runs) causes kernel panic and the device
>> >reboots. 
>
>Out of curiosity, is it a per-CS-line thing or is this section
>protected on all CS?
>

Sorry, I didn't get your question. 

>> >
>> >Ok, so this is not a chip feature but more a host constraint.
>> >
>> >In this case it would be a good idea to add a host DT property which
>> >describes the zone to avoid accessing it. Something like:
>> >
>> >	secure-area/secure-section = <start length>;
>> >
>> >From the core perspective, we should parse this property early
>enough
>> >and return -EIO when trying to access this area.
>
>FWIW, I'm not sure making it part of the core is a good idea, at least
>not until we have a different platform with a same needs. The
>controller driver can parse it and return -EACCESS (or -EIO) when this
>section is accessed.

Fine with me. 

Thanks, 
Mani

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