linux-kernel - Re: [PATCH v5 1/3] spi: airoha-snfi: en7523: workaround flash damaging if UART

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Message-ID: <aSYPLWKEz0lzBtjf@smile.fi.intel.com>
Date: Tue, 25 Nov 2025 22:18:53 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>, Ray Liu <ray.liu@...oha.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	Andreas Gnau <andreas.gnau@...sys.eu>
Subject: Re: [PATCH v5 1/3] spi: airoha-snfi: en7523: workaround flash
 damaging if UART_TXD was short to GND

On Tue, Nov 25, 2025 at 10:16:33PM +0300, Mikhail Kshevetskiy wrote:
> Airoha EN7523 specific bug
> --------------------------
> We found that some serial console may pull TX line to GROUND during board
> boot time. Airoha uses TX line as one of its bootstrap pins. On the EN7523
> SoC this may lead to booting in RESERVED boot mode.
> 
> It was found that some flashes operates incorrectly in RESERVED mode.
> Micron and Skyhigh flashes are definitely affected by the issue,
> Winbond flashes are not affected.
> 
> Details:
> --------
> DMA reading of odd pages on affected flashes operates incorrectly. Page
> reading offset (start of the page) on hardware level is replaced by 0x10.
> Thus results in incorrect data reading. As result OS loading becomes
> impossible.
> 
> Usage of UBI make things even worse. On attaching, UBI will detects
> corruptions (because of wrong reading of odd pages) and will try to
> recover. For recovering UBI will erase and write 'damaged' blocks with
> a valid information. This will destroy all UBI data.
> 
> Non-DMA reading is OK.
> 
> This patch detects booting in reserved mode, turn off DMA and print big
> fat warning.

LGTM now, thanks!
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>

-- 
With Best Regards,
Andy Shevchenko