![]() ![]() ![]() partial_overlay_custom_dts "pl-partial-final.dts" command then pl-partial-.dtsi and pl-partial-custom-.dtsi will get created and included in pl-partial-final.dts If user issues %xsct set_property CONFIG.pl-partial-custom-.dtsi: This is a file where we can customize the dfx ip nodes.pl-partial-.dtsi: This is a file where all the memory mapped IP nodes for dynamic function exchange designs(DFX).zynqmp-clk-ccf.dtsi: This file contains all the clock information for the peripheral IPs.zynqmp.dtsi: This file contains all the PS peripheral information and also the cpu info.system-top.dts: This is a file where it contains the memory information, early console and the boot arguments.pcw.dtsi: This is a file where the dynamic properties where the PS peripheral needs.pl.dtsi: This is a file where all the memory mapped peripheral logic(PL) IP nodes will be available.Once we generate there will be different files available in the output directory, say for example pl.dtsi, pcw.dtsi, system-top.dts, zynqmp.dtsi, zynqmp-clk-ccf.dtsi, pl-partial-*.dtsi(the suffix of rprm will be added and this files will get generated only for partial/dfx xsa files). Generally for the SOCs there will be a static dts/dtsi files, but when it comes to the FPGA there can be many complicated designs which the peripheral logic(PL) IPs may vary or might be having different configurations.įor these complicated FPGA designs we require a Device tree generator(DTG) where it can generate the dts/dtsi automatically for those designs. fixed in silicon) while another DTSI can be used to describe dynamic hardware (i.e. For example, as described in more detail below, one DTSI can be used to describe fixed hardware (i.e. Using DTSI files allows information to be organized amongst different files. There will be a single top-level *.dts file with "include" statements to reference separate DTS include (DTSI) files. The DTG generates DTS files with *.dts and *.dtsi file extensions. Xilinx Vitis installation (or previously Xilinx SDK).XSA Hardware hand-off file generated by Xilinx Vivado tool (previously HDF) If you're not using the latest version of Xilinx tools make sure you refer to the appropriate sub-section beyond the first one presented. The "Generate DTS Files" section below provides several sub-sections for each of these different procedures. Additionally, for some tool versions, there may be GUI flows versus CLI flows. The procedure for using the DTG varies for older versions of Xilinx tools. DTG will populate various DTS files with as much information as it can based on a supplied XSA file and then the user will be expected to fill-in the blanks or adjust as needed. This is because a lot of information captured in a DTS can be extracted from information in the hardware hand-off file (XSA). Building a DTS for custom hardware will always be a somewhat manual process but the DTG can help jump-start users to a fairly advanced starting point. The DTG is intended to help users build their hardware-specific DTS file. ![]() There is generally a top-level interrupt-parent definition for the main interrupt controller. Interrupt-parent: Is a phandle that points to the interrupt controller for the current node. #interrupt-cells: Indicates the number of cells in the interrupts property for the interrupts managed by the selected interrupt controller. ![]() Interrupt-controller: Is a boolean property that indicates that the current node is an interrupt controller. #size-cells: The size part of the reg property. #address-cells: Property indicate how many cells (i.e 32 bits values) are needed to form the base address part in the reg property. Values always given with the most-specific first, to least-specific last. } Devicetree Properties compatible: The top-level compatible property typically defines a compatible string for the board, and then for the SoC. Under the root node typically consists ofģ) Chosen can have configuration data like the kernel parameters string and the location of an initrd imageĥ) Nodes which define the buses informationĬompatible = "arm,cortexa53", "arm,armv8" Ĭompatible = "arm,gic-400", "arm,cortex-a15-gic" Root node is the parent for all the nodes. Based on the driver it can have child nodes or parent node.For example a device connected by SPI bus will have SPI bus controller as its parent node and that device will be one of the child node of spi node. Linux uses the DT basically for platform identification, run-time configuration like bootargs and the device node population.Įach driver or a module in the device tree is defined by the node and all its properties are defined under that node. This describes the hardware which is readable by an operating system like Linux so that it doesn't need to hard code details of the machine. Device tree or simply called DT is a data structure that describes the hardware. ![]()
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