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#!/usr/bin/env python3
# This script enables easy, cross-platform building without the need
# to install third-party Python modules.
import sys
import os
import subprocess
import argparse
DEPS_DIR = "deps"
'migen': '',
'litex': '',
'litescope': '',
'pyserial': '',
'liteeth': '',
'liteusb': '',
'litedram': '',
'litepcie': '',
'litesdcard': '',
'liteiclink': '',
'litevideo': '',
# Obtain the path to this script, plus a trailing separator. This will
# be used later on to construct various environment variables for paths
# to a variety of support directories.
script_path = os.path.dirname(os.path.realpath(__file__)) + os.path.sep
# Look through the specified file for known variables to get the dependency list
def get_required_dependencies(filename):
import ast
# Always check the Python version
dependencies = {
'python': 1
main_src = ""
with open(sys.argv[0], 'r') as f:
main_src =
main_ast = ast.parse(main_src, filename=filename)
return list(dependencies.keys())
# Iterate through the top-level nodes looking for variables named
# LX_DEPENDENCIES or LX_DEPENDENCY and get the values that are
# assigned to them.
for node in ast.iter_child_nodes(main_ast):
if isinstance(node, ast.Assign):
value = node.value
for target in node.targets:
if isinstance(target, ast.Name):
if isinstance(value, (ast.List, ast.Tuple)):
for elt in value.elts:
if isinstance(elt, ast.Str):
dependencies[elt.s] = 1
elif isinstance(value, ast.Str):
dependencies[value.s] = 1
# Set up sub-dependencies
if 'riscv' in dependencies:
dependencies['make'] = 1
return list(dependencies.keys())
def get_python_path(script_path, args):
# Python has no concept of a local dependency path, such as the C `-I``
# switch, or the nodejs `node_modules` path, or the rust cargo registry.
# Instead, it relies on an environment variable to append to the search
# path.
# Construct this variable by adding each subdirectory under the `deps/`
# directory to the PYTHONPATH environment variable.
python_path = []
if os.path.isdir(script_path + DEPS_DIR):
for dep in os.listdir(script_path + DEPS_DIR):
dep = script_path + DEPS_DIR + os.path.sep + dep
if os.path.isdir(dep):
return python_path
def fixup_env(script_path, args):
os.environ["PYTHONPATH"] = os.pathsep.join(get_python_path(script_path, 0))
# Set the "LXBUILDENV_REEXEC" variable to prevent the script from continuously
# reinvoking itself.
os.environ["LXBUILDENV_REEXEC"] = "1"
# Python randomizes the order in which it traverses hashes, and Migen uses
# hashes an awful lot when bringing together modules. As such, the order
# in which Migen generates its output Verilog will change with every run,
# and the addresses for various modules will change.
# Make builds deterministic so that the generated Verilog code won't change
# across runs.
os.environ["PYTHONHASHSEED"] = "1"
# Some Makefiles are invoked as part of the build process, and those Makefiles
# occasionally have calls to Python. Ensure those Makefiles use the same
# interpreter that this script is using.
os.environ["PYTHON"] = sys.executable
# Set the environment variable "V" to 1. This causes Makefiles to print
# the commands they run, which makes them easier to debug.
if "lx_verbose" in args and args.lx_verbose:
os.environ["V"] = "1"
# If the user just wanted to print the environment variables, do that and quit.
if args.lx_print_env:
# Equivalent to the powershell Get-Command, and kinda like `which`
def get_command(cmd):
if == 'nt':
path_ext = os.environ["PATHEXT"].split(os.pathsep)
path_ext = [""]
for ext in path_ext:
for path in os.environ["PATH"].split(os.pathsep):
if os.path.exists(path + os.path.sep + cmd + ext):
return path + os.path.sep + cmd + ext
return None
def check_python_version(args):
import platform
# Litex / Migen require Python 3.5 or newer. Ensure we're running
# under a compatible version of Python.
if sys.version_info[:3] < (3, 5):
return (False,
"python: You need Python 3.5+ (version {} found)".format(sys.version_info[:3]))
return (True, "python 3.5+: ok (Python {} found)".format(platform.python_version()))
def check_vivado(args):
vivado_path = get_command("vivado")
if vivado_path == None:
# Look for the default Vivado install directory
if == 'nt':
base_dir = r"C:\Xilinx\Vivado"
base_dir = "/opt/Xilinx/Vivado"
if os.path.exists(base_dir):
for file in os.listdir(base_dir):
bin_dir = base_dir + os.path.sep + file + os.path.sep + "bin"
if os.path.exists(bin_dir + os.path.sep + "vivado"):
os.environ["PATH"] += os.pathsep + bin_dir
vivado_path = bin_dir
if vivado_path == None:
return (False, "toolchain not found in your PATH", "download it from")
return (True, "found at {}".format(vivado_path))
def check_cmd(args, cmd, name=None, fix=None):
if name is None:
name = cmd
path = get_command(cmd)
if path == None:
return (False, name + " not found in your PATH", fix)
return (True, "found at {}".format(path))
def check_make(args):
return check_cmd(args, "make", "GNU Make")
def check_riscv(args):
riscv64 = check_cmd(args, "riscv64-unknown-elf-gcc", "riscv toolchain", "download it from")
if riscv64[0] == True:
return riscv64
riscv32 = check_cmd(args, "riscv32-unknown-elf-gcc", "riscv toolchain", "download it from")
if riscv32[0] == True:
return riscv32
return riscv64
def check_yosys(args):
return check_cmd(args, "yosys")
def check_arachne(args):
return check_cmd(args, "arachne-pnr")
def check_icestorm(args):
return check_cmd(args, "icepack") and check_cmd(args, "nextpnr-ice40")
dependency_checkers = {
'python': check_python_version,
'vivado': check_vivado,
'make': check_make,
'riscv': check_riscv,
'yosys': check_yosys,
'arachne-pnr': check_arachne,
'icestorm': check_icestorm,
# Validate that the required dependencies (Vivado, compilers, etc.)
# have been installed.
def check_dependencies(args, dependency_list):
dependency_errors = 0
for dependency_name in dependency_list:
if not dependency_name in dependency_checkers:
print('WARNING: Unrecognized dependency "{}"'.format(dependency_name))
result = dependency_checkers[dependency_name](args)
if result[0] == False:
if len(result) > 2:
print('{}: {} -- {}'.format(dependency_name, result[1], result[2]))
print('{}: {}'.format(dependency_name, result[1]))
dependency_errors = dependency_errors + 1
elif args.lx_check_deps or args.lx_verbose:
print('dependency: {}: {}'.format(dependency_name, result[1]))
if dependency_errors > 0:
if args.lx_ignore_deps:
print('{} missing dependencies were found but continuing anyway'.format(dependency_errors))
raise SystemExit(str(dependency_errors) +
" missing dependencies were found")
if args.lx_check_deps:
# Return True if the given tree needs to be initialized
def check_module_recursive(root_path, depth, verbose=False):
if verbose:
print('git-dep: checking if "{}" requires updating...'.format(root_path))
# If the directory isn't a valid git repo, initialization is required
if not os.path.exists(root_path + os.path.sep + '.git'):
return True
# If there are no submodules, no initialization needs to be done
if not os.path.isfile(root_path + os.path.sep + '.gitmodules'):
return False
# Loop through the gitmodules to check all submodules
gitmodules = open(root_path + os.path.sep + '.gitmodules', 'r')
for line in gitmodules:
parts = line.split("=", 2)
if parts[0].strip() == "path":
path = parts[1].strip()
if check_module_recursive(root_path + os.path.sep + path, depth + 1, verbose=verbose):
return True
return False
# Determine whether we need to invoke "git submodules init --recurse"
def check_submodules(script_path, args):
if check_module_recursive(script_path, 0, verbose=args.lx_verbose):
print("Missing submodules -- updating")
subprocess.Popen(["git", "submodule", "update",
"--init", "--recursive"], cwd=script_path).wait()
elif args.lx_verbose:
print("Submodule check: Submodules found")
def lx_git(cmd, *args):
import subprocess
git_cmd = ["git", cmd]
if args is not None:
for arg in args:
git_cmd = git_cmd + [arg]
def lx_print_deps():
print('Known dependencies:')
for dep in dependency_checkers.keys():
print(' {}'.format(dep))
print('To define a dependency, add a variable inside {} at the top level called LX_DEPENDENCIES and assign it a list or tuple.'.format(sys.argv[0]))
print('For example:')
print('LX_DEPENDENCIES = ("riscv", "vivado")')
def lx_main(args):
if args.lx_print_env:
fixup_env(script_path, args)
elif args.lx_print_deps:
elif args.lx_run is not None:
fixup_env(script_path, args)
check_submodules(script_path, args)
[sys.executable] + [script_name] + args.lx_run[1:]).wait())
elif args.init:
if args.main is None:
main_name = os.getcwd().split(os.path.sep)[-1] + '.py'
new_main_name = input('What would you like your main program to be called? [' + main_name + '] ')
if new_main_name is not None and new_main_name != "":
main_name = new_main_name
main_name = args.main
if not main_name.endswith('.py'):
main_name = main_name + '.py'
if args.no_git:
print("skipping git initialization")
if not os.path.exists(DEPS_DIR):
if not os.path.exists(".git"):
print("initializing git repository")
print("using existing git repository")
lx_git('add', str(__file__))
for dep_name, dep_url in DEFAULT_DEPS.items():
dest_path = '{}{}{}'.format(DEPS_DIR, '/', dep_name)
if not os.path.exists(dest_path):
lx_git('submodule', 'add', dep_url, dest_path)
lx_git('add', dest_path)
lx_git('submodule', 'update', '--init', '--recursive')
if args.no_bin:
print("skipping bin/ initialization")
elif os.path.exists("bin"):
print("bin/ directory exists -- remove bin/ directory to re-initialize")
bin_tools = {
'mkmscimg': '',
'litex_term': 'litex.utils.litex_term',
'litex_server': 'litex.utils.litex_server',
'litex_sim': 'litex.utils.litex_sim',
'litex_read_verilog': 'litex.utils.litex_read_verilog',
'litex_simple': 'litex.boards.targets.simple',
bin_template = """#!/usr/bin/env python3
import sys
import os
# This script lives in the "bin" directory, but uses a helper script in the parent
# directory. Obtain the current path so we can get the absolute parent path.
script_path = os.path.dirname(os.path.realpath(
__file__)) + os.path.sep + os.path.pardir + os.path.sep
sys.path.insert(0, script_path)
import lxbuildenv
print("Creating binaries")
for bin_name, python_module in bin_tools.items():
with open('bin' + os.path.sep + bin_name, 'w') as new_bin:
new_bin.write('from ' + python_module + ' import main\n')
import stat
os.chmod('bin' + os.path.sep + bin_name, stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
if not args.no_git:
lx_git('add', '--chmod=+x', 'bin' + os.path.sep + bin_name)
if os.path.exists(main_name):
print("skipping creation of {}: file exists".format(main_name))
print("creating main program {}".format(main_name))
with open(main_name, 'w') as m:
program_template = """#!/usr/bin/env python3
# This variable defines all the external programs that this module
# relies on. lxbuildenv reads this variable in order to ensure
# the build will finish without exiting due to missing third-party
# programs.
LX_DEPENDENCIES = ["riscv", "vivado"]
# Import lxbuildenv to integrate the deps/ directory
import lxbuildenv
# Disable pylint's E1101, which breaks completely on migen
from migen import *
from import VivadoProgrammer, XilinxPlatform
from import Pins, IOStandard
from litex.soc.integration import SoCSDRAM
from litex.soc.integration.builder import Builder
from litex.soc.integration.soc_core import csr_map_update
_io = [
("clk50", 0, Pins("J19"), IOStandard("LVCMOS33")),
class Platform(XilinxPlatform):
def __init__(self, toolchain="vivado", programmer="vivado", part="35"):
part = "xc7a" + part + "t-fgg484-2"
def create_programmer(self):
if self.programmer == "vivado":
return VivadoProgrammer(flash_part="n25q128-3.3v-spi-x1_x2_x4")
raise ValueError("{} programmer is not supported"
def do_finalize(self, fragment):
XilinxPlatform.do_finalize(self, fragment)
class BaseSoC(SoCSDRAM):
csr_peripherals = [
# "dna",
csr_map_update(SoCSDRAM.csr_map, csr_peripherals)
def __init__(self, platform, **kwargs):
clk_freq = int(100e6)
def main():
platform = Platform()
soc = BaseSoC(platform)
builder = Builder(soc, output_dir="build", csr_csv="test/csr.csv")
vns =
if __name__ == "__main__":
if not args.no_git:
lx_git("add", main_name)
return False
return True
# For the main command, parse args and hand it off to main()
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description="Wrap Python code to enable quickstart",
"-h", "--help", '--lx-help', help="show this help message and exit", action="help"
'-i', '--init', '--lx-init', help='initialize a new project', action="store_true"
'-m', '--main', '--lx-main', help='name of main project'
'--no-bin', '--lx-no-bin', help="don't create a bin/ directory"
'--no-git', '--lx-no-git', help="Don't create a git repository"
'-e', '--print-env', '--lx-print-env', dest="lx_print_env", help="print environment variable listing for pycharm, vscode, or bash", action="store_true"
'-d', '--print-deps', '--lx-print-deps', dest="lx_print_deps", help="print all possible dependencies and then exit", action="store_true"
"--lx-verbose", help="increase verboseness of some processes", action="store_true"
'-r', '--run', '--lx-run', dest='lx_run', help="run the given script under lxbuildenv", nargs=argparse.REMAINDER
args = parser.parse_args()
if not lx_main(args):
elif not os.path.isfile(sys.argv[0]):
print("lxbuildenv doesn't operate while in interactive mode")
elif "LXBUILDENV_REEXEC" not in os.environ:
parser = argparse.ArgumentParser(
description="Wrap Python code to enable quickstart",
"--lx-verbose", help="increase verboseness of some processes", action="store_true"
"--lx-print-env", help="print environment variable listing for pycharm, vscode, or bash", action="store_true"
"--lx-check-deps", help="check build environment for dependencies such as compiler and fpga tools and then exit", action="store_true"
"--lx-print-deps", help="print all possible dependencies and then exit", action="store_true"
"--lx-help", action="help"
"--lx-ignore-deps", help="try building even if dependencies are missing", action="store_true"
(args, rest) = parser.parse_known_args()
if args.lx_print_deps:
deps = get_required_dependencies(sys.argv[0])
fixup_env(script_path, args)
check_dependencies(args, deps)
check_submodules(script_path, args)
[sys.executable] + [sys.argv[0]] + rest).wait())
# Overwrite the deps directory.
# Because we're running with a predefined PYTHONPATH, you'd think that
# the DEPS_DIR would be first.
# Unfortunately, setuptools causes the sitewide packages to take precedence
# over the PYTHONPATH variable.
# Work around this bug by inserting paths into the first index.
for path in get_python_path(script_path, None):
sys.path.insert(0, path)