| commit | 82a3cbb751717b10c9da59e59ae6f3a696d971f2 | [log] [tgz] |
|---|---|---|
| author | hamzashabbir517 <shabbirhamza517@gmail.com> | Wed Jun 09 01:13:19 2021 +0500 |
| committer | hamzashabbir517 <shabbirhamza517@gmail.com> | Wed Jun 09 01:13:19 2021 +0500 |
| tree | a6fe5cf373d28a6a93dfd64d40e35eff07462992 | |
| parent | 366126155261c9b536c1fb61711e311a8610c3dd [diff] |
BrqRV EB1 integrated into user project example
This repository contains the brqrv eb1 Core design RTL. Brqrv Eb1 Is A Machine-Mode (M-Mode) Only, 32-Bit Cpu Small Core Which Supports Risc-V’s Integer (I), Compressed Instruction (C), Multiplication And Division (M), And Instruction-Fetch Fence, And Csr Extensions. The Core Contains A 4-Stage, Scalar, In-Order Pipeline
├── configs # Configurations Dir │ └── snapshots # Where generated configuration files are created ├── design # Design root dir │ ├── dbg # Debugger │ ├── dec # Decode, Registers and Exceptions │ ├── dmi # DMI block │ ├── exu # EXU (ALU/MUL/DIV) │ ├── ifu # Fetch & Branch Prediction │ ├── include │ ├── lib │ └── lsu # Load/Store ├── docs ├── tools # Scripts/Makefiles └── testbench # (Very) simple testbench ├── asm # Example assembly files ├── hex # Canned demo hex files └── tests # Example tests
BrqRV can be configured by running the $RV_ROOT/configs/brqrv.config script:
% $RV_ROOT/configs/brqrv.config -h for detailed help options
For example to build with a DCCM of size 64 Kb:
% $RV_ROOT/configs/brqrv.config -dccm_size=64
This will update the default snapshot in $RV_ROOT/configs/snapshots/default/ with parameters for a 64K DCCM.
Add -snapshot=dccm64, for example, if you wish to name your build snapshot dccm64 and refer to it during the build.
This script derives the following consistent set of include files :
$RV_ROOT/configs/snapshots/default ├── common_defines.vh # `defines for testbench or design ├── defines.h # #defines for C/assembly headers ├── eb1_param.vh # Design parameters ├── eb1_pdef.vh # Parameter structure ├── pd_defines.vh # `defines for physical design ├── perl_configs.pl # Perl %configs hash for scripting ├── pic_map_auto.h # PIC memory map based on configure size └── whisper.json # JSON file for brqrv-iss └── link.ld # default linker control file
while in a work directory:
Set the RV_ROOT environment variable to the root of the brqrv directory structure. Example for bash shell:export RV_ROOT=/path/to/brqrv
Example for csh or its derivatives:setenv RV_ROOT /path/to/brqrv
Create your specific configuration
(Skip if default is sufficient)
(Name your snapshot to distinguish it from the default. Without an explicit name, it will update/override the default snapshot) For example if mybuild is the name for the snapshot:
set BUILD_PATH environment variable:
setenv BUILD_PATH snapshots/mybuild
$RV_ROOT/configs/brqrv.config [configuration options..] -snapshot=mybuild
Snapshots are placed in $BUILD_PATH directory
Running a simple Hello World program (verilator)
make -f $RV_ROOT/tools/Makefile
This command will build a verilator model of brqrv eb1 with AXI bus, and execute a short sequence of instructions that writes out “HELLO WORLD” to the bus.
The simulation produces output on the screen like:
VerilatorTB: Start of sim ---------------------------------- Hello World from brqrv eb1 @WDC !! ---------------------------------- TEST_PASSED Finished : minstret = 437, mcycle = 922 See "exec.log" for execution trace with register updates..
The simulation generates following files:
console.log contains what the cpu writes to the console address of 0xd0580000.exec.log shows instruction trace with GPR updates.trace_port.csv contains a log of the trace port.
When debug=1 is provided, a vcd file sim.vcd is created and can be browsed by gtkwave or similar waveform viewers.
You can re-execute simulation using:make -f $RV_ROOT/tools/Makefile verilator
The simulation run/build command has following generic form:
make -f $RV_ROOT/tools/Makefile [<simulator>] [debug=1] [snapshot=mybuild] [target=<target>] [TEST=<test>] [TEST_DIR=<path_to_test_dir>]
where:
<simulator> - can be 'verilator' (by default) 'irun' - Cadence xrun, 'vcs' - Synopsys VCS, 'vlog' Mentor Questa
'riviera'- Aldec Riviera-PRO. if not provided, 'make' cleans work directory, builds verilator executable and runs a test.
debug=1 - allows VCD generation for verilator and VCS and SHM waves for irun option.
<target> - predefined CPU configurations 'default' ( by default), 'default_ahb', 'typical_pd', 'high_perf'
TEST - allows to run a C (<test>.c) or assembly (<test>.s) test, hello_world is run by default
TEST_DIR - alternative to test source directory testbench/asm or testbench/tests
<snapshot> - run and build executable model of custom CPU configuration, remember to provide 'snapshot' argument
for runs on custom configurations.
CONF_PARAMS - allows to provide -set options to brqrv.conf script to alter predefined eb1 targets parameters
Example:
make -f $RV_ROOT/tools/Makefile verilator TEST=cmark
will build and simulate testbench/asm/cmark.c program with verilator
If you want to compile a test only, you can run:
make -f $RV_ROOT/tools/Makefile program.hex TEST=<test> [TEST_DIR=/path/to/dir]