Create README.md
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Zvonimir Bandic
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# Cores-SweRV
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SweRV EH1 core
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SweRV RISC-V CoreTM from Western Digital
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This repository contains the SweRV CoreTM design RTL
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License
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By contributing to this project, you agree that your contribution is governed by Apache-2.0.
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Files under the tools directory may be available under a different license. Please review individual file for details.
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Directory Structure
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├── configs # Configurations Dir
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│ └── snapshots # Where generated configuration files are created
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├── design # Design root dir
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│ ├── dbg # Debugger
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│ ├── dec # Decode, Registers and Exceptions
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│ ├── dmi # DMI block
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│ ├── exu # EXU (ALU/MUL/DIV)
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│ ├── ifu # Fetch & Branch Prediction
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│ ├── include
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│ ├── lib
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│ └── lsu # Load/Store
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├── docs
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├── tools # Scripts/Makefiles
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└── testbench # (Very) simple testbench
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├── asm # Example assembly files
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└── hex # Canned demo hex files
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Dependencies
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Verilator (3.926 or later) must be installed on the system
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If adding/removing instructions, espresso must be installed (used by tools/coredecode)
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Quickstart guide
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Clone the repository
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Setup RV_ROOT to point to the path in your local filesystem
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Determine your configuration {optional}
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Run make with tools/Makefile
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Configurations
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SweRV can be configured by running the $RV_ROOT/configs/swerv.config script:
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% $RV_ROOT/configs/swerv.config -h for detailed help options
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For example to build with a DCCM of size 64 :
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% $RV_ROOT/configs/swerv.config -dccm_size=64
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This will update the default snapshot in $RV_ROOT/configs/snapshots/default/ with parameters for a 64K DCCM.
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Add -snapshot=dccm64, for example, if you wish to name your build snapshot dccm64 and refer to it during the build.
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This script derives the following consistent set of include files :
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$RV_ROOT/configs/snapshots/default
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├── common_defines.vh # `defines for testbench or design
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├── defines.h # #defines for C/assembly headers
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├── pd_defines.vh # `defines for physical design
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├── perl_configs.pl # Perl %configs hash for scripting
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├── pic_ctrl_verilator_unroll.sv # Unrolled verilog based on PIC size
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├── pic_map_auto.h # PIC memory map based on configure size
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└── whisper.json # JSON file for swerv-iss
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Building a model
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Set the RV_ROOT environment variable to the root of the SweRV directory structure
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RV_ROOT = /path/to/swerv
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export RV_ROOT
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Create your configuration
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(Skip if default is sufficient)
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(Name your snapshot to distinguish it from the default. Without an explicit name, it will update/override the default snapshot)
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$RV_ROOT/configs/swerv.config [configuration options..] -snapshot=mybuild
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Snapshots are placed in $RV_ROOT/configs/snapshots/<snapshot name>/ directory
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Build with verilator:
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make -f $RV_ROOT/tools/Makefile verilator [snapshot=name]
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This will create and populate the verilator obj_dir/ in the current work dir.
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Other targets supported:
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vcs (Synopsys)
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irun (Cadence)
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Running a simple Hello World program (verilator)
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RV_ROOT = /path/to/swerv
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export RV_ROOT
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make -f $RV_ROOT/tools/Makefile verilator-run
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This will build a verilator model of SweRV with AHB-lite bus, and execute a short sequence of instructions that writes out "HELLO WORLD" to the bus.
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You can re-execute using
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./obj_dir/Vtb_top
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Start of sim
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------------------------------
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Hello World from SweRV @WDC !!
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------------------------------
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Finished : minstret = 389, mcycle = 1658
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End of sim
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A vcd file sim.vcd is created which can be browsed by gtkwave or similar waveform viewers. trace_port.csv contains a log of the trace port.
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The Makefile allows you to specify different assembly files from command line
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make -f $RV_ROOT/tools/Makefile verilator-run ASM_TEST=my_hellow_world.s ASM_TEST_DIR=/path/to/dir
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If you change only the assembly files, you do not need to rebuild verilator, just specify the target as program.hex :
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make -f $RV_ROOT/tools/Makefile program.hex ASM_TEST=my_hello_world.s ASM_TEST_DIR=/path/to/dir
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./obj_dir/Vtb_top
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Western Digital, the Western Digital logo, G-Technology, SanDisk, Tegile, Upthere, WD, SweRV Core, SweRV ISS, and OmniXtend are registered trademarks or trademarks of Western Digital Corporation or its affiliates in the US and/or other countries. All other marks are the property of their respective owners.
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