linux-kernel - Re: [PATCH v3 1/3] spi: airoha-snfi: en7523: workaround flash damaging if UART

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Message-ID: <15bf444c-0eff-4856-93a4-764668666c3c@collabora.com>
Date: Thu, 20 Nov 2025 11:18:11 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>,
 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>,
 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
Cc: Andreas Gnau <andreas.gnau@...sys.eu>
Subject: Re: [PATCH v3 1/3] spi: airoha-snfi: en7523: workaround flash
 damaging if UART_TXD was short to GND

Il 20/11/25 05:27, Mikhail Kshevetskiy ha scritto:
> We found that some serial console may pull TX line to GROUND during board
> boot time. Airoha uses TX line as one of it's BOOT pins. This will 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. Usage of UBI make things even
> worse. Any attempt to access UBI leads to ubi damaging. As result OS loading
> becomes impossible.
> 
> Non-DMA reading is OK.
> 
> This patch detects booting in reserved mode, turn off DMA and print big
> fat warning.
> 
> Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>

This is important enough to get a Fixes tag.

Please resend with the appropriate one, after which:

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>