linux-kernel - [PATCH v1 1/1] ARM: dts: aspeed: yosemite4: allocate ramoops for kernel panic

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Message-Id: <20250905014009.588269-1-Delphine_CC_Chiu@wiwynn.com>
Date: Fri,  5 Sep 2025 09:40:08 +0800
From: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
To: patrick@...cx.xyz, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...econstruct.com.au>,
        Kees Cook <kees@...nel.org>, Tony Luck <tony.luck@...el.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>
Cc: Zane Li <zane_li@...ynn.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH v1 1/1] ARM: dts: aspeed: yosemite4: allocate ramoops for kernel panic

From: Zane Li <zane_li@...ynn.com>

Reserve a ramoops memory region in the Yosemite4 device tree so that
kernel panic logs can be preserved across reboots. This helps with
post-mortem debugging and crash analysis.

Signed-off-by: Zane Li <zane_li@...ynn.com>
---
 .../dts/aspeed/aspeed-bmc-facebook-yosemite4.dts   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
index aae789854c52..4ec1abae1175 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
@@ -49,6 +49,20 @@ memory@...00000 {
 		reg = <0x80000000 0x80000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		ramoops@...fa000 {
+			compatible = "ramoops";
+			reg = <0xb8dfa000 0x6000>;
+			record-size = <0x2000>;
+			console-size = <0x2000>;
+			pmsg-size = <0x2000>;
+			max-reason = <1>;
+		};
+	};
+
 	iio-hwmon {
 		compatible = "iio-hwmon";
 		io-channels = <&adc0 0>, <&adc0 1>, <&adc0 2>, <&adc0 3>,
-- 
2.25.1