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Signed-off-by: Sean Cross <sean@xobs.io>
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Sean Cross 2018-09-27 15:34:24 +08:00
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
Copyright 2018 Sean Cross
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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"You" (or "Your") shall mean an individual or Legal Entity
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:toc:
:toc-placement!:
ifdef::env-github[]
:tip-caption: :bulb:
:note-caption: :information_source:
:important-caption: :heavy_exclamation_mark:
:caution-caption: :fire:
:warning-caption: :warning:
endif::[]
# lxbuildenv - Simple LiteX Build Environment
lxbuildenv is a Python module that takes care of setting up your build environment for LiteX. It is simple to use, cross-platform, and self-contained.
## Usage - Initial Setup
NOTE: The initial setup process is, admittedly, a little rough. Patches are welcome.
You can execute `lxbuildenv.py` directly. Run `python lxbuildenv.py --init` to create a new project. This will perform the following steps:
1. Ask you for a main entrypoint name, if `--main` was not set
1. Create a git repository, if one does not already exist
1. Create a `bin` directory and populate it, if `--no-bin` was not set
1. Create an initial template program
From this point onwards, you do not need to invoke `lxbuildenv.py`. However, it must still be present in order for your program to run.
## Usage - Running your Program
The purpose of `lxbuildenv.py` is to make it easier to get started on a project. It's also designed to help you work on support libraries. It tries to use system dependencies whenever possible, including using system Python and system compilers.
As such, `lxbuildenv.py` does some tricky things with `PYTHONPATH`. It also re-executes itself to ensure `PYTHONHASHSEED` is set. Additionally, it ensures you have any dependencies installed already.
It does not download dependencies for you -- for certain software that's not even legally allowed. Instead it makes sure the software exists and is usable, and where to obtain it if it's not available.
The `lxbuildenv.py` script adds several command line arguments to your program. These all begin with `--lx-`. To list all parameters provided by `lxbuildenv.py`, run `--lx-help`.
WARNING: Because it adjusts the import path, you must `import lxbuildenv` before you import any other packages.
### Specifying Dependencies
Dependencies are specified by adding a variable in your main file called `LX_DEPENDENCIES`. The fact that this is a variable rather than some other method should set off alarm bells and tell you something funny is going on in `lxbuildenv.py`. This is true.
As part of its initialization, `lxbuildenv.py` will read in your program and look for this variable. It will then check any dependencies you've specified to ensure they are met, and may patch up the environment if necessary. For example, if you specify `vivado` as a dependency, `lxbuildenv` will make sure it can run the `vivado` program, and will add `/opt/Xilinx/.../` or `C:\\Xilinx\\...` to the `PATH` as necessary.
To list all possible dependencies, run `python lxbuildenv.py --lx-print-deps`. If you want to try building something without having all the necessary dependencies, add `--lx-ignore-deps` to your build.
## Usage - Tools
As part of its setup, `lxbuildenv.py` creates a `bin/` directory. These are all very thin wrappers around existing tools. You can run these tools using `python`. For example, `python bin/litex_server`.

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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"
# 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 = ""
try:
with open(sys.argv[0], 'r') as f:
main_src = f.read()
main_ast = ast.parse(main_src, filename=filename)
except:
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 target.id == "LX_DEPENDENCIES" or target.id == "LX_DEPENDENCY":
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):
python_path.append(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 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:
print("PYTHONPATH={}".format(os.environ["PYTHONPATH"]))
print("PYTHONHASHSEED={}".format(os.environ["PYTHONHASHSEED"]))
print("PYTHON={}".format(sys.executable))
print("LXBUILDENV_REEXEC={}".format(os.environ["LXBUILDENV_REEXEC"]))
sys.exit(0)
# Equivalent to the powershell Get-Command, and kinda like `which`
def get_command(cmd):
if os.name == 'nt':
path_ext = os.environ["PATHEXT"].split(os.pathsep)
else:
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 os.name == 'nt':
base_dir = r"C:\Xilinx\Vivado"
else:
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
break
if vivado_path == None:
return (False, "toolchain not found in your PATH", "download it from https://www.xilinx.com/support/download.html")
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):
return check_cmd(args, "riscv64-unknown-elf-gcc", "riscv toolchain", "download it from https://www.sifive.com/products/tools/")
def check_yosys(args):
return check_cmd(args, "yosys")
def check_arachne(args):
return check_cmd(args, "arachne-pnr")
dependency_checkers = {
'python': check_python_version,
'vivado': check_vivado,
'make': check_make,
'riscv': check_riscv,
'yosys': check_yosys,
'arachne-pnr': check_arachne,
}
# 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))
continue
result = dependency_checkers[dependency_name](args)
if result[0] == False:
if len(result) > 2:
print('{}: {} -- {}'.format(dependency_name, result[1], result[2]))
else:
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))
else:
raise SystemExit(str(dependency_errors) +
" missing dependencies were found")
if args.lx_check_deps:
sys.exit(0)
# 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 main(args):
if args.init:
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
print("Initializing git repository")
if not os.path.exists(DEPS_DIR):
os.mkdir(DEPS_DIR)
os.system("git init")
os.system("git add " + str(__file__))
os.system("git submodule add https://github.com/m-labs/migen.git deps/migen")
os.system("git add deps/migen")
os.system("git submodule add https://github.com/enjoy-digital/litex.git deps/litex")
os.system("git add deps/litex")
os.system("git submodule add https://github.com/enjoy-digital/litescope deps/litescope")
os.system("git add deps/litescope")
os.system("git submodule add https://github.com/pyserial/pyserial.git deps/pyserial")
os.system("git add deps/pyserial")
os.system("git submodule update --init --recursive")
bin_tools = {
'litex_server': 'litex.soc.tools.remote.litex_server',
'litex_term': 'litex.soc.tools.litex_term',
'mkmscimg': 'litex.soc.tools.mkmscimg',
'mkmscimg': 'litex.soc.tools.mkmscimg',
'litex_sim': 'litex.boards.targets.sim',
'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
"""
# Create binary programs under bin/
if not os.path.exists("bin"):
print("Creating binaries")
os.mkdir("bin")
for bin_name, python_module in bin_tools.items():
with open('bin' + os.path.sep + bin_name, 'w') as new_bin:
new_bin.write(bin_template)
new_bin.write('from ' + python_module + ' import main\n')
new_bin.write('main()\n')
os.system('git add --chmod=+x bin' + os.path.sep + bin_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
#pylint:disable=E1101
from migen import *
from litex.build.generic_platform import *
_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")
else:
raise ValueError("{} programmer is not supported"
.format(self.programmer))
def do_finalize(self, fragment):
XilinxPlatform.do_finalize(self, fragment)
class BaseSoC(SoCSDRAM):
csr_peripherals = [
"ddrphy",
# "dna",
"xadc",
"cpu_or_bridge",
]
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 = builder.build()
soc.do_exit(vns)
if __name__ == "__main__":
main()
"""
m.write(program_template)
return
# 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",
add_help=False)
parser.add_argument(
"-h", "--help", help="show this help message and exit", action="help"
)
parser.add_argument(
'-i', '--init', help='initialize a new project', action="store_true"
)
args = parser.parse_args()
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",
add_help=False)
parser.add_argument(
"--lx-verbose", help="increase verboseness of some processes", action="store_true"
)
parser.add_argument(
"--lx-print-env", help="print environment variable listing for pycharm, vscode, or bash", action="store_true"
)
parser.add_argument(
"--lx-check-deps", help="check build environment for dependencies such as compiler and fpga tools and then exit", action="store_true"
)
parser.add_argument(
"--lx-print-deps", help="print all possible dependencies and then exit", action="store_true"
)
parser.add_argument(
"--lx-help", action="help"
)
parser.add_argument(
"--lx-ignore-deps", help="try building even if dependencies are missing", action="store_true"
)
(args, rest) = parser.parse_known_args()
if args.lx_all_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")')
sys.exit(0)
deps = get_required_dependencies(sys.argv[0])
fixup_env(script_path, args)
check_dependencies(args, deps)
check_submodules(script_path, args)
try:
sys.exit(subprocess.Popen(
[sys.executable] + [sys.argv[0]] + rest).wait())
except:
sys.exit(1)
else:
# 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)