arm64: dts: marvell: armada-ap806: reserve PSCI area

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@gmx.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
index 176e38d..ec0da5b 100644 (file)
--- 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@4000000 {
+                       reg = <0x0 0x4000000 0x0 0x200000>;
+                       no-map;
+               };
+       };
+
        ap806 {
                #address-cells = <2>;
                #size-cells = <2>;