linux-kernel - Re: [PATCH v2 1/3] spi: airoha-snfi: en7523: workaround flash damaging if UART

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Message-ID: <aRpGidWIakkclJTz@sirena.co.uk>
Date: Sun, 16 Nov 2025 21:47:53 +0000
From: Mark Brown <broonie@...nel.org>
To: Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>, Ray Liu <ray.liu@...oha.com>,
	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>,
	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 v2 1/3] spi: airoha-snfi: en7523: workaround flash
 damaging if UART_TXD was short to GND

On Sun, Nov 16, 2025 at 03:00:36PM +0300, Mikhail Kshevetskiy wrote:

> +				"==================================================================\n"
> +				"Detected booting in RESERVED mode (UART_TXD was short to GND).\n"
> +				"This mode is known for incorrect DMA reading of some flashes.\n"
> +				"Usage of DMA for flash operations will be disabled to prevent data\n"
> +				"damage. Unplug your serial console and power cycle the board\n"
> +				"to boot with full performance.\n"
> +				"==================================================================\n");

Multi-line prints aren't idiomatic for the kernel, we usually have just
one line per print.  If you want multiple lines use multiple prints
(like the trace_printk() warning).

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