linux-kernel - [PATCH v2 1/1] arm64: dts: marvell: armada-ap806: reserve PSCI area

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Date:   Fri, 21 Dec 2018 17:45:03 +0100
From:   Heinrich Schuchardt <xypron.glpk@....de>
To:     Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>
Cc:     Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Heinrich Schuchardt <xypron.glpk@....de>
Subject: [PATCH v2 1/1] arm64: dts: marvell: armada-ap806: reserve PSCI area

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.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
---
v2
	Move the change from armada-8040-mcbin.dts to armada-ap806.dtsi.
	I only have a MACCHIATObin for testing but
	https://github.com/MarvellEmbeddedProcessors/linux-marvell
	has the reservation in that file.
---
 arch/arm64/boot/dts/marvell/armada-ap806.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
index 7d94c1fa592a..f8dafef83db0 100644
--- a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
@@ -28,6 +28,17 @@
 		method = "smc";
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		psci-area@...0000 {
+			reg = <0x0 0x4000000 0x0 0x200000>;
+			no-map;
+		};
+	};
+
 	ap806 {
 		#address-cells = <2>;
 		#size-cells = <2>;
-- 
2.19.2