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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: James Hilliard <james.hilliard1@gmail.com>
Cc: Richard Weinberger <richard@nod.at>,
	 Vignesh Raghavendra <vigneshr@ti.com>,
	 Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>,
	 Chen-Yu Tsai <wens@kernel.org>,
	 Jernej Skrabec <jernej.skrabec@gmail.com>,
	 Samuel Holland <samuel@sholland.org>,
	 Maxime Ripard <mripard@kernel.org>,
	linux-mtd@lists.infradead.org,  devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	 linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] mtd: rawnand: sunxi: support randomized OOB formats
Date: Fri, 04 Sep 2026 16:42:09 +0200	[thread overview]
Message-ID: <87se3p13jy.fsf@bootlin.com> (raw)
In-Reply-To: <20260810-submit-sunxi-nand-vendor-oob-layout-v1-v1-2-463853a14ad9@gmail.com> (James Hilliard's message of "Mon, 10 Aug 2026 17:04:50 -0600")

On 10/08/2026 at 17:04:50 -06, James Hilliard <james.hilliard1@gmail.com> wrote:

> The controller randomizer covers the bad block marker along with the
> rest of the OOB data. The driver currently compensates the marker bytes
> before writes and after reads so that they remain plain on flash.
>
> Allwinner NAND firmware instead stores the marker through the
> randomizer. Media using that format appears to contain bad blocks unless
> the randomizer is enabled while reading the marker.
>
> Honor the allwinner,randomized-oob property by unconditionally enabling
> page scrambling and leaving the marker in the randomizer data stream.
> Keep the existing plain marker behavior when the property is absent.
> This changes marker handling on all supported controllers; the H6/H616
> protected user-data placement is handled separately.

But I think the reason why this has never been done is because it just
breaks raw accesses, including the BBT reads. I don't think this is
handled, is it?

Thanks,
Miquèl

WARNING: multiple messages have this Message-ID (diff)
From: Miquel Raynal <miquel.raynal@bootlin.com>
To: James Hilliard <james.hilliard1@gmail.com>
Cc: Richard Weinberger <richard@nod.at>,
	 Vignesh Raghavendra <vigneshr@ti.com>,
	 Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>,
	 Chen-Yu Tsai <wens@kernel.org>,
	 Jernej Skrabec <jernej.skrabec@gmail.com>,
	 Samuel Holland <samuel@sholland.org>,
	 Maxime Ripard <mripard@kernel.org>,
	linux-mtd@lists.infradead.org,  devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	 linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] mtd: rawnand: sunxi: support randomized OOB formats
Date: Fri, 04 Sep 2026 16:42:09 +0200	[thread overview]
Message-ID: <87se3p13jy.fsf@bootlin.com> (raw)
In-Reply-To: <20260810-submit-sunxi-nand-vendor-oob-layout-v1-v1-2-463853a14ad9@gmail.com> (James Hilliard's message of "Mon, 10 Aug 2026 17:04:50 -0600")

On 10/08/2026 at 17:04:50 -06, James Hilliard <james.hilliard1@gmail.com> wrote:

> The controller randomizer covers the bad block marker along with the
> rest of the OOB data. The driver currently compensates the marker bytes
> before writes and after reads so that they remain plain on flash.
>
> Allwinner NAND firmware instead stores the marker through the
> randomizer. Media using that format appears to contain bad blocks unless
> the randomizer is enabled while reading the marker.
>
> Honor the allwinner,randomized-oob property by unconditionally enabling
> page scrambling and leaving the marker in the randomizer data stream.
> Keep the existing plain marker behavior when the property is absent.
> This changes marker handling on all supported controllers; the H6/H616
> protected user-data placement is handled separately.

But I think the reason why this has never been done is because it just
breaks raw accesses, including the BBT reads. I don't think this is
handled, is it?

Thanks,
Miquèl

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

  reply	other threads:[~2026-09-04 14:42 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-10 23:04 [PATCH 0/3] mtd: rawnand: sunxi: support the Allwinner randomized OOB format James Hilliard
2026-08-10 23:04 ` James Hilliard
2026-08-10 23:04 ` [PATCH 1/3] dt-bindings: mtd: sunxi: Add randomized OOB flag James Hilliard
2026-08-10 23:04   ` James Hilliard
2026-08-10 23:04 ` [PATCH 2/3] mtd: rawnand: sunxi: support randomized OOB formats James Hilliard
2026-08-10 23:04   ` James Hilliard
2026-09-04 14:42   ` Miquel Raynal [this message]
2026-09-04 14:42     ` Miquel Raynal
2026-09-04 15:17     ` James Hilliard
2026-09-04 15:17       ` James Hilliard
2026-09-04 15:27       ` Miquel Raynal
2026-09-04 15:27         ` Miquel Raynal
2026-09-04 16:31         ` James Hilliard
2026-09-04 16:31           ` James Hilliard
2026-08-10 23:04 ` [PATCH 3/3] mtd: rawnand: sunxi: select the packed H6/H616 OOB layout James Hilliard
2026-08-10 23:04   ` James Hilliard

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