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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):
15.0.1- Select a different Task
Recent Changes
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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 6.6 was used for testing)
- Altera SoC EDS 15.0.1 (for GHRD, Device Tree Generator and Device Tree Compiler)
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):$ ~/altera/15.0/embedded/embedded_command_shell.sh $ cd ~/a10_soc_devkit_ghrd3. Run the Device Tree Generator
$ sopc2dts --input 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 --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 ghrd_10as066n2.dtb ghrd_10as066n2.dtsThis will generate the file ~/a10_soc_devkit_ghrd/ghrd_10as066n2.dtb required by Linux to boot.
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