linux-kernel - [PATCH 4.19 58/99] arm64: dts: marvell: armada-ap806: reserve PSCI area

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Date:   Mon, 21 Jan 2019 14:48:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Heinrich Schuchardt <xypron.glpk@....de>,
        Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: [PATCH 4.19 58/99] arm64: dts: marvell: armada-ap806: reserve PSCI area

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heinrich Schuchardt <xypron.glpk@....de>

commit 132ac39cffbcfed80ada38ef0fc6d34d95da7be6 upstream.

The memory area [0x4000000-0x4200000[ is occupied by the PSCI firmware. Any
attempt to access it from Linux leads to an immediate crash.

So let's make the same memory reservation as the vendor kernel.

[gregory: added as comment that this region matches the mainline U-boot]
Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/boot/dts/marvell/armada-ap806.dtsi |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
@@ -27,6 +27,23 @@
 		method = "smc";
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/*
+		 * This area matches the mapping done with a
+		 * mainline U-Boot, and should be updated by the
+		 * bootloader.
+		 */
+
+		psci-area@...0000 {
+			reg = <0x0 0x4000000 0x0 0x200000>;
+			no-map;
+		};
+	};
+
 	ap806 {
 		#address-cells = <2>;
 		#size-cells = <2>;