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Generating the Linux Device Tree How to generate the device tree source and how to compile it to a device tree blob file that Linux needs
Configuration
Board(s):
Altera Arria 10 SoC BoardTools Version(s):
17.1, 18.0, 18.1, 19.1, 19.3Tags:
Linux Device Tree- Select a different Task
Recent Changes
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Information abut latest bootloaders for Cortex A9 based SoC FPGA devices
Overview
Important Note: This page refers to the Linux Device Tree, that is required by Linux in order to boot. On Arria 10 there are two different Device Trees: one required by Bootloader (U-Boot) and this one, required by the Linux kernel.
Reference Information
For detailed information about the Device Tree Generator see Device Tree Generator User Guide.Prerequisites
The following items are required:- Host PC running Linux (CentOS 6.8 was used for testing)
- Intel SoC EDS based on Release Tags
Procedure
1. Compile the GHRD as described in Compiling the Hardware Design to obtain the .sopcinfo file. Or simply use the pre-compiled GHRD. 2. Start an Embedded Command Shell and go to GHRD folder (assumed here to be saved in the home folder):$ ~/intelFPGA/19.3/embedded/embedded_command_shell.sh $ cd ~/a10_soc_devkit_ghrd3. Run the Device Tree Generator
$ sopc2dts --input ghrd_10as066n2/ghrd_10as066n2.sopcinfo --output ghrd_10as066n2.dts --board hps_a10_common_board_info.xml --board hps_ a10_devkit_board_info.xml --board ghrd_10as066n2_board_info.xml --bridge-removal all --clocksin 18.0 Pro version and above
$sopc2dts --input qsys_top/qsys_top.sopcinfo --output ghrd_10as066n2.dts --board hps_a10_common_board_info.xml --board hps_ a10_devkit_board_info.xml --board qsys_top_board_info.xml --bridge-removal all --clocksThis will generate the file ~/a10_soc_devkit_ghrd/ghrd_10as066n2.dts which a text representation of the Device Tree. 5. Use the Device Tree Compiler (dtc) to convert the device tree source to the binary format required to build Linux
$ dtc -I dts -O dtb -o socfpga_arria10_socdk_sdmmc.dtb ghrd_10as066n2.dtsThis will generate the file ~/a10_soc_devkit_ghrd/socfpga_arria10_socdk_sdmmc.dtb required by Linux to boot.
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