/* * pcie-32bit-dma-overlay.dts */ /dts-v1/; /plugin/; / { compatible = "brcm,bcm2711"; fragment@0 { target-path = "/aliases"; __overlay__ { /* * Removing this alias stops the firmware patching the * PCIE DT dma-ranges based on the detected chip * revision. */ pcie0 = ""; }; }; fragment@1 { target = <&pcie0>; __overlay__ { /* * The size of the range is rounded up to a power of 2, * so the range ends up being 0-4GB, and the MSI vector * gets pushed beyond 4GB. */ #address-cells = <3>; #size-cells = <2>; dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>; }; }; };