Hi Rob, Maybe you could help me here as I am trying to understand where is the error (cross compiling on ARM): $ make exynos_defconfig $ make dtbs_check arch/arm/boot/dts/exynos5410-smdk5410.dt.yaml: soc: memory-controller@12250000:ranges: [[0, 0, 67108864, 131072, 1, 0, 83886080, 131072, 2, 0, 100663296, 131072, 3, 0, 117440512, 131072]] is not valid under any of the given schemas (Possible causes of the failure): arch/arm/boot/dts/exynos5410-smdk5410.dt.yaml: soc: memory-controller@12250000:ranges: [[0, 0, 67108864, 131072, 1, 0, 83886080, 131072, 2, 0, 100663296, 131072, 3, 0, 117440512, 131072]] is not of type 'boolean' arch/arm/boot/dts/exynos5410-smdk5410.dt.yaml: soc: memory-controller@12250000:ranges:0: [0, 0, 67108864, 131072, 1, 0, 83886080, 131072, 2, 0, 100663296, 131072, 3, 0, 117440512, 131072] is too long From schema: local/lib/python3.6/site-packages/dtschema/schemas/simple-bus.yaml This is a Exynos SROM memory controller with four banks like this: arch/arm/boot/dts/exynos5410.dtsi 376 &sromc { 377 #address-cells = <2>; 378 #size-cells = <1>; 379 ranges = <0 0 0x04000000 0x20000 380 1 0 0x05000000 0x20000 381 2 0 0x06000000 0x20000 382 3 0 0x07000000 0x20000>; 383 }; Converting it to: 376 &sromc { 377 #address-cells = <2>; 378 #size-cells = <1>; 379 ranges = <0 0 0x04000000 0x20000>, 380 <1 0 0x05000000 0x20000>, 381 <2 0 0x06000000 0x20000>, 382 <3 0 0x07000000 0x20000>; 383 }; silences the error although I cannot check whether this even works (I don't have this HW). Is it because of simple-bus schema which expects an array of arrays of 3 to 7 size? Best regards, Krzysztof