linux-kernel - [PATCH v2 2/2] arm64: tegra: Add reserved-memory node for P2180

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Message-Id: <20250803-p3450-mts-bug-v2-2-6307125408c3@gmail.com>
Date: Sun, 03 Aug 2025 22:14:31 -0500
From: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: devicetree@...r.kernel.org, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Aaron Kling <webgeek1234@...il.com>
Subject: [PATCH v2 2/2] arm64: tegra: Add reserved-memory node for P2180

From: Aaron Kling <webgeek1234@...il.com>

The Tegra210 L4T bootloader ram training will corrupt the in-ram kernel
dt if no reserved-memory node exists. This prevents said bootloader from
being able to boot a kernel without this node, unless a chainloaded
bootloader loads the dt. Add the node to eliminate the requirement for
extra boot stages.

Signed-off-by: Aaron Kling <webgeek1234@...il.com>
---
 arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
index 9b9d1d15b0c7eafd3895f02db1bc747d7cc8923c..4a3ed10bde4f084477b10bb50be007da263088e9 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
@@ -17,6 +17,12 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+	};
+
 	memory@...00000 {
 		device_type = "memory";
 		reg = <0x0 0x80000000 0x1 0x0>;

-- 
2.50.1