linux-kernel - Re: [PATCH] arm64: dts: qcom: x1e: bus is 40-bits (fix 64GB models)

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Message-ID: <20251201001353.9852-1-threeway@gmail.com>
Date: Sun, 30 Nov 2025 18:13:53 -0600
From: Steev Klimaszewski <threeway@...il.com>
To: jonathan@...ek.ca
Cc: abel.vesa@...aro.org,
	andersson@...nel.org,
	christopher.obbard@...aro.org,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	konradybcio@...nel.org,
	krzk+dt@...nel.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	quic_rjendra@...cinc.com,
	robh@...nel.org,
	sibi.sankar@....qualcomm.com,
	stephan.gerhold@...aro.org
Subject: Re: [PATCH] arm64: dts: qcom: x1e: bus is 40-bits (fix 64GB models)

Hi All,

On my Thinkpad T14S OLED with 64GB, with this patch applied, I am unable to boot
the laptop anymore.  It doesn't matter whether I have mem=30GB, nor if I set
CONFIG_ARM64_VA_BITS_39, or not limiting the ram - shortly after loading the
device tree, the laptop just resets.  

I have tried over 20 boots with it applied, as well as trying both booting a
working kernel, and then rebooting as well as cold boots.

-- steev