ARM: dts: rockchip: reserve unusable memory region on rk3288

[deliverable/linux.git] / arch / arm / boot / dts / rk3288.dtsi

diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index 2db91c9ccac2e694b70d2235ddd723ac0a373209..906e938fb6bfc70d9ec7948171ad425f34ae11f3 100644 (file)
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -169,6 +169,26 @@
                };
        };
 
+       reserved-memory {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               /*
+                * The rk3288 cannot use the memory area above 0xfe000000
+                * for dma operations for some reason. While there is
+                * probably a better solution available somewhere, we
+                * haven't found it yet and while devices with 2GB of ram
+                * are not affected, this issue prevents 4GB from booting.
+                * So to make these devices at least bootable, block
+                * this area for the time being until the real solution
+                * is found.
+                */
+               dma-unusable@fe000000 {
+                       reg = <0xfe000000 0x1000000>;
+               };
+       };
+
        xin24m: oscillator {
                compatible = "fixed-clock";
                clock-frequency = <24000000>;