Introduction

The build system is built on GNU Makefile with helper scripts that provide the following functionality:

• Perform dependency analysis that enables discovery and compilation of dependent files from a top level file
• Generate simulation scripts, synthesis projects, as well as QSYS systems and megafunction IP cores
• Execute simulation and synthesis target programs after completing all preparatory steps.

Run make help for a list of targets, and make helpall for descriptions.

To get started

• clone or copy the hdl_build repository
• to choose global default tools, create defaults.mk, or locally set SIM_TOOL and/or SYNTH_TOOL in your makefile
  • defaults.mk is placed in the root of the hdl_build repo. See examples/example-defaults.mk for a template
• copy the examples/example.mk file to your project build directory and rename it to Makefile
  • example.mk has the minimum for both sim and synth targets, with a QSF_EXTRA setting that will allow synthesis without worrying about pin assignments.
  • See examples/example-full-sim.mk and examples/example-full-synth.mk for examples of more options
• edit Makefile
  • add the correct simulation top module name as TOP_SIM and/or correct synthesis top module name as TOP_SYNTH
  • set correct path to the hdl_build repository. For flexibility, the examples use an environment variable $HDL_BUILD_PATH to help committed build files work in multiple environments, but a fixed path would work too.
• run make sim or make synth
  • synthesis projects require setting FAMILY and DEVICE

See the full makefile examples for adding other features to your project Makefile.

Software Requirements

This build system depends on Intel Quartus, Siemens Questa or Modelsim, and Vivado xsim for synthesis and simulation. Other tools could be added.

The tool commands (vsim, quartus, etc.) need to be in the path already.

Quartus synthesis requires two variables in the use Makefile to create a project:

• FAMILY, for example FAMILY := "Arria 10"
• DEVICE, for example DEVICE := 10AS123N2F40I2SG

Quartus install path must have the string "pro" in it if using Quartus Pro, and must not have "pro" in it if using Quartus Standard. The default path name of intelFPGA_pro meets this requirement.

Python 3.6 or higher is required, with the PyYAML yaml package installed for substitution files. If Python 3.6 is not available, replace all the 'f' strings with .format strings.

The build system is designed to run within a git repository. To work outside of a repo see section "Outside of git".

Extending hdl_build

To add new makefiles that are not upstreamed, create *_addon.mk or *_custom.mk makefiles in the base directory. These files will be included by build.mk, but keeping them as separate files reduces merge/rebase conflicts. The _custom.mk suffix is ignored by git and is intended to be used for files you do not want committed at all.

Verilog Coding Requirements and Naming Conventions

Module, package, and include dependencies are automatically determined for verilog sources.

• Modules can only be implemented in files with .v or .sv extensions. Non-HDL modules like vendor IP are not discovered automatically and must be specified as a subtitution.
• The module name must be the same as the "base" of the filename. For example, module fifo could be implemented as fifo.sv.
  • Megafunction IP cores should be saved using the _qmw.v suffix. This is the only exception where the filename can be different than the module name. For example, a PLL called clkgen should be stored as clkgen_qmw.v (this is the file that has the megawizard settings embedded as comments). The module name in the code should still be clkgen without the _qmw extension. The build system will automatically handle building the megafunction for synthesis.
• Only a single module definition is allowed per file.
• Header files included by preprocessor `include must use .svh or .vh extension.
• In cases where a module needs to be replaced with a sim-only or synth-only module, use SIM_SUBSTITUTIONS or SYNTH_SUBSTITUTIONS. Modules used as substitutions do not need follow any naming conventions because they will be found by direct path rather than the built-in search capability, but the module name used in the substitution must match the module being substituted.

Usage

Including the build system

The build system can be included in a local Makefile with the following include line in the makefile:

include $(HDL_BUILD_PATH)/build.mk

or

include /path/to/hdl_build/build.mk

• As a general guide:
  • variables used under build.mk need to be set before the include.
  • hooks are rules defined under build.mk need to be tied into after the include.
• The tool chain needs an entry point defined, such as TOP_SIM for simulation and TOP_SYNTH for synthesis.

Build parameters and targets

build.mk

The build.mk file provides the entry point and the basic structure for the build system. Use make help for an up-to-date list of targets provided.

• VERBOSE: Set VERBOSE=1 for a call to make to run fully verbose commands
• NOUPDATE: Set NOUPDATE=1 for a call to make to print every line instead of updating
• SLOW: Set SLOW=1 for a call to make to disable parallel building
• GIT_REPO: this variable is only defined if the Makefile is in a git repository (test if git repo with make's ifdef)
• SRC_BASE_DIR: directory that holds all relevant source code. Will be determined automatically if in a git repository.
• IGNORE_FILE: touch .ignore_build_system in a directory that should be ignored by the build system
• BLD_DIR: directory where build results are stored
• $(predependency_hook): target hook to run something before dependency analysis
• SIM_TOOL: select which simulation tool should be used: modelsim, questa or qverify, vivado
• SYNTH_TOOL: select which synthesis tool should be used: quartuspro, quartus or vivado
• IGNORE_DIRS: a list of space delineated directory names to ignore during dependency search
• EXTRA_DIRS: a list of space delineated directory names to add during dependency search. This is only useful for directories normally ignored by the build system or a directory outside the SRC_BASE_DIR directory.
• clean: target to force redo of build steps and remove previous logs
• cleanall: target to remove all build results
• nuke: target to alias for cleanall
• list_targets: target to list all available Makefile targets
• print-%: target to use make print-VARIABLE_NAME to examine VARIABLE_NAME's value.
  • make print-BLD_DIR
• print-Makefiles: target to print a list of all included makefiles
• help: target to show brief help.
• helpall: target to show this help.

modelsim.mk or questa.mk

The modelsim.mk or questa.mk file provides simulator related targets and consumes the dependency analysis results of build.mk.

• TOP_SIM: identify the top module to be simulated with TOP_SIM. If not set, TOP will be used.
• SIM_SUBSTITUTIONS: a space delineated list of either module:filename mappings, or paths to a yaml file defining mappings. If a mapping is blank, dependency matching for the module is blocked. See examples/example-subs.yml.
  • SIM_SUBSTITUTIONS = $(shell git_root_path sim_models/sim_all_ipcores.yml) eth_1g:$(shell git_root_path sim_models/1g_sim_model.sv ignorememodule:
• SIM_LIB_APPEND: library string to appned to the library list, like -L $(SIM_LIB_DIR)/customlib
• deps: target to figure out sim dependencies only
• comp: target to compile simulation files
• vopt: target to perform vopt after compile
• filelist_sim: target to print list of files used in sim
• modules_sim: target to print list of modules used in sim
• AC_DIRECTIVES: Autocheck directives filename, default is ac_directives.tcl
• printquesta-%: use make printquesta-VAR_NAME to print variable after questa processing
• $(presimlib_hook): target hook to run before sim libraries
• $(precomp_hook): target hook to run before compilation
• $(presim_hook): target hook to run before starting sim
• RESTART_SCRIPT: bld/restart.do can be used in the simulator to recompile source and restart the simulation using restart -f. The current session and waveform is backed up first. The first optional parameter is log which will log all signals and memories after restart. Following parameters will be executed after restart.
  • do bld/restart.do log run 100 ns will log things and then run for 100 ns. It can be helpful to tie the command to a keyboard shortcut.
• RESIM_SCRIPT: bld/resim.do can be used in the simulator to recompile source and restart the simulation using quit -sim. The current session and waveform is backed up first and the transcript is archived and cleared. The first optional parameter is log which will log all signals and memories after restart. Following parameters will be executed after restart.
  • do bld/resim.do log run 100 ns will log things and then run for 100 ns. It can be helpful to tie the command to a keyboard shortcut.
• VLOG_OPTIONS: extra options for vlog command
• VOPT_OPTIONS: extra options for vopt command
• VSIM_OPTIONS: extra options for vsim command
• PARAM_*: monitors variables prefixed with PARAM_ and passes them to simulator. PARAM_NUM_PACKETS := 20 passes a parameter named NUM_PACKETS with value of 20.
• sim: target to run simulation in GUI
• elab_sim: target to run elaboration batch
• batch: target to run simulation batch
• autocheck_batch: (or ac_batch) Run autocheck in console only
• autocheck: (or ac) Run autocheck GUI
• COV_COVER_OPT: Coverage options for vopt command
• COV_MERGED_UCDB: Location to store result of accumulated coverage report
• COV_VSIM_OPT: Coverage options for vsim command
• COVERAGE_COMMANDS: commands to add to batch for coverage
• vopt_coverage: target to perform vopt for coverage after compile
• sim_coverage: target to run simulation in GUI with coverage
• elab_coverage: target to run elaboration batch for coverage
• batch_coverage: target to run simulation batch with coverage
• batch_accumulate_coverage: target to run simulation batch with coverage that accumulates
• coverage_view: target to view coverage
• coverage_view_all: target to view accumulated coverage
• clean_cover_db: target to remove accumulated coverage ucdb file

vivado xsim.mk

The xsim.mk file provides Vivado simulator targets and consumes the dependency analysis results of build.mk.

• TOP_SIM: identify the top module to be simulated with TOP_TB. If not set, TOP will be used.
• printxsim-%: use make printxsim-VAR_NAME to print variable after xsim processing
• $(prexsimlib_hook): target hook to run before xsim libraries
• $(prexcomp_hook): target hook to run before compilation
• $(prexsim_hook): target hook to run before starting xsim
• XVLOG_OPTIONS: options for xvlog command
• XELAB_OPTIONS: options for the xelab command
• XSIM_OPTIONS: options for xsim command
• SIM_SUBSTITUTIONS: a space delineated list of either module:filename mappings, or paths to a yaml file defining mappings. If a mapping is blank, dependency matching for the module is blocked. See example-subs.yml
• XSIM_LIB_APPEND: library string to appned to the library list, like -L $(XSIM_LIB_DIR)/customlib
• deps: target to figure out xsim dependencies only
• comp: target to compile simulation files
• filelist_xsim: target to print list of files used in xsim
• modules_xsim: target to print list of modules used in xsim
• PARAM_*: monitors variables prefixed with PARAM_ and passes them to xsimulator. PARAM_NUM_PACKETS := 20 passes a parameter named NUM_PACKETS with value of 20.
• elab_sim: target to run elaboration batch
• sim: target to run simulation in GUI
• batch: target to run simulation batch

quartus.mk

The quartus.mk file provides Quartus related targets and consumes the dependency analysis results of build.mk.

• TOP_SYNTH: identify the top module to be simulated with TOP_SYNTH. If not set, TOP will be used.
• FAMILY: identify the FPGA product family, like "Stratix 10" or "Agilex". Should match Quartus string in project settings
• DEVICE: identify the FPGA device part number, should match Quartus string in project settings
• NUM_TIMING_TRIES: tell synth_timing number of tries before giving up on timing
• $(presynth_hook): target hook to run before any synth work
• $(post_qgen_ip_hook): target hook to run after ip generation is done, before mapping
• printquartus-%: use make printquartus-VAR_NAME to print variable after Quartus processing
• SYNTH_OVERRIDE: synthesis enforces SYNTH_TOOL version match against tool on PATH. Run make with SYNTH_OVERRIDE=1 to ignore the check.
• SYNTH_SUBSTITUTIONS: a space delineated list of either module:filename mappings, or paths to a yaml file defining mappings. If a mapping is blank, dependency matching for the module is blocked. See examples/example-subs.yml.
  • SYNTH_SUBSTITUTIONS = $(shell git_root_path mocks/s10_mocks.yml) eth_100g:$(shell git_root_path mocks/100g_core.ip simonly_check:
• QUARTUS_FILE: file path to a tcl file for Quartus settings that will be included in the QSF
• XCVR_SETTINGS: file path to a tcl file for transciever settings that will be included in the QSF
• SDC_FILE: file path to an SDC timing constraints file that will be used in the QSF
• QSF_EXTRA: a variable string that will be included directly in QSF
• filelist_synth: print list of files used in synth
• modules_synth: print list of modules used in synth
• PRO_RESULT: track whether Quartus Pro or Std is being used. If Std, sets VERILOG_MACRO STD_QUARTUS=1. Always sets VERILOG_MACRO SYNTHESIS=1
• PARAM_*: monitors variables prefixed with PARAM_ and passes them to Quartus. PARAM_NUM_PORTS := 2 passes a parameter named NUM_PORTS with value of 2.
• synth_tcl.mk: all QSF files get the values set in synth_tcl.mk global settings, including jtag.sdc
• project: target to create Quartus project
• quartus: target to open Quartus GUI
• quartus_fast: target to open Quartus GUI without waiting for ip generation
• git_info: target to archive git info in project directory
• ipgen: target to generate Quartus IP
• elab_synth: target to run through Quartus analysis and elaboration
• map: target to run through Quartus synthesis/mapping
• fit: target to run through Quartus fit
• asm: target to run through Quartus assembler (no timing)
• timing: target to run through Quartus timing (no assembler)
• gen_timing_rpt: target to generate TQ_timing_report.txt
• run_timing_rpt: target to generate TQ_timing_report.txt without checking dependencies
• fit_timing: target to run fit until timing is made
• asm_timing: target to Quartus assembler after running fit until timing is made
• synth: target to run full synthesis: map fit asm timing
• synth_timing: target to run full synthesis, running fit until timing is made
• ARCHIVE_DIR: archive base location, default is $(BLD_DIR)/archive
• ARCHIVE_SUB_DIR: archive subdirectory location, default is build_YYYY_MM_DD-HH.MM-gitbranch
• ARCHIVE_FILE_PREFIX: prefix archive files, default is archive_
• ARCHIVE_DEST: path archive files will be copied. Default is $(ARCHIVE_DIR)/$(ARCHIVE_SUB_DIR)
• archive_synth_results: target to archive synthesis results to ARCHIVE_DEST
• synth_archive: target to run full synthesis and archive when done
• synth_archive_timing: target to run full synthesis, running fit until timing is made, and archive when done
• timing_rpt: target to print timing report
• timing_rpt_timing: target to print timing report after repeating fit until timing is met
• timing_check_all: target to report timing problems
• timing_check_all_timing: target to report timing problems after repeating fit until timing is met

Outside of git

If you want to use this outside of a git repository, you will need to set the source path in your Makefile like this:

SRC_BASE_DIR := /path/to/current/src_base_dir
TOP_SIM = test_mod

include $(HDL_BUILD_PATH)/build.mk

If you are in a git repository, the SRC_BASE_DIR defaults to the root of the repository.