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Thu, 19 Mar 2026 02:34:59 +0000 From: Nick Xie To: neil.armstrong@linaro.org, khilman@baylibre.com, martin.blumenstingl@googlemail.com, jbrunet@baylibre.com Cc: krzk+dt@kernel.org, robh@kernel.org, conor+dt@kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nick Xie , Ronald Claveau Subject: [PATCH v2] arm64: dts: amlogic: t7: khadas-vim4: fix memory layout for 8GB RAM Date: Thu, 19 Mar 2026 10:34:46 +0800 Message-Id: <20260319023446.3422695-1-nick@khadas.com> X-Mailer: git-send-email 2.34.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: TYWPR01CA0010.jpnprd01.prod.outlook.com (2603:1096:400:a9::15) To PS1PPF62EEA9B1D.apcprd03.prod.outlook.com (2603:1096:308::2da) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PS1PPF62EEA9B1D:EE_|SEZPR03MB6490:EE_ X-MS-Office365-Filtering-Correlation-Id: 99246c07-4219-4546-8309-08de85601d64 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|52116014|376014|366016|1800799024|38350700014|56012099003|18002099003; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The Khadas VIM4 features 8GB of LPDDR4X RAM. The previous memory node mapped a single incorrect region. This caused the kernel to map MMIO and secure firmware (ATF/TrustZone) memory holes as standard RAM, leading to an Asynchronous SError Interrupt during early boot (paging_init) when the kernel attempted to clear those pages. Fix this by splitting the 8GB memory layout into three separate regions to properly avoid the memory holes (e.g., 0xe0000000 - 0xffffffff): - 3.5GB @ 0x000000000 - 3.5GB @ 0x100000000 - 1.0GB @ 0x200000000 Signed-off-by: Nick Xie Suggested-by: Ronald Claveau --- Changes in v2: - Removed leading zeroes in the memory node reg property. Link to v1: https://lore.kernel.org/all/20260306031014.2421875-1-nick@khadas.com/ arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts index 25b478e106451..f4c953034be39 100644 --- a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts +++ b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts @@ -17,7 +17,9 @@ aliases { memory@0 { device_type = "memory"; - reg = <0x0 0x0 0x2 0x0>; /* 8 GB */ + reg = <0x0 0x0 0x0 0xE0000000 + 0x1 0x0 0x0 0xE0000000 + 0x2 0x0 0x0 0x40000000>; /* 8 GB */ }; reserved-memory { -- 2.34.1