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.

[gregory: added as comment that this region matches the mainline U-boot]
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
index 7d94c1fa592a..7f799cb5668e 100644
--- a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
@@ -28,6 +28,23 @@
                 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@4000000 {
+                        reg = <0x0 0x4000000 0x0 0x200000>;
+                        no-map;
+                };
+        };
+
         ap806 {
                 #address-cells = <2>;
                 #size-cells = <2>;