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The virtual prototype consists of three directories:

• modules: This directory contains the several modules that are contained in the SOC. Add your own modules in this directory. Most modules also contain a doc directory with documentation.
• programms: This directory contains the "hello world" template that can be used as basis for your own programms.
• systems: This directory contains all the required files for the "top level" of the SOC.

To be able to build the Virtual Prototype hardware, there are several files:

• systems/singleCore/scripts/gecko4_or1420.tcl: This file contains the pin-mapping of the top level to the FPGA-pins. For the add-on board they are already contained as remarks, for the one's of the GECKO4Education you can visit the wiki page.
• systems/singleCore/config/project.device.intel: This file contains the definitions of the FPGA used on the GECKO4Education. Do not modify this file.
• systems/singleCore/config/project.files: This file contains a list with all Verilog files that are required to build the Virtual Prototype. If you add modules, you have also to modify this file such that the modules are found.
• systems/singleCore/config/project.intel: This file contains generic commands for the Intel Quartus Lite tool. Do not modify this file.
• systems/singleCore/config/project.qsf: This file is responsible to include the gecko4_or1420.tcl file. Do not modify this file.
• systems/singleCore/config/project.toplevel: This file contains the name of the top-level module. Normally you should not have to modify this file.

bit 27 of busRequests and busGrants reserved for DMA controller

As the tools are quite "heavy" and to provide a automated flow, a makefile system is used. To build the system:

• Goto the directory systems/singleCore/ (e.g. cd systems/singleCore/).
• Type: make intel_bit
• If no errors occurred you'll find in the directory systems/singleCore/sandbox the files or1420SingleCore.cfg and or1420SingleCore.rbf. These files can be used to program your FPGA with the open-source tool openocd of the oss-cad-suite by executing openocd -f or1420SingleCore.cfg on the machine to which the GECKO4Education board is connected. Alternatively you can use the intel quartus programmer, for this you require the file or1420SingleCore.sof, which is also available in the directory systems/singleCore/sandbox

Also the software is based on a makefile system. To build a program follow following steps (with as example the hello world program):

• Goto the directory programms/helloWorld
• Execute make clean mem
• If no error occurred, you will find in the directory programms/helloWorld/build-release/ the files hello.elf, hello.cmem, and hello.mem. The file that you need to upload to your board is the hello.cmem-file.
• Upload the hello.cmem-file with your favorite terminal program to your virtual prototype.

IMPORTANT: As the or1420 does not contain a hardware-divide unit you have to compile your programm with the compile option -msoft-div!