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Merge pull request #338 from DurandA/master 

Add optional 'ignore-loops' flag to nextpnr
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enjoy-digital 2020-01-12 21:18:23 +01:00 committed by GitHub
parent 26fe45fce1 d24a4b5428
commit ff066a5e09
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 3 deletions
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11
litex/build/lattice/trellis.py
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@ -113,11 +113,11 @@ nextpnr_ecp5_architectures = {
_build_template = [
"yosys -q -l {build_name}.rpt {build_name}.ys",
"nextpnr-ecp5 --json {build_name}.json --lpf {build_name}.lpf --textcfg {build_name}.config \
--{architecture} --package {package} --speed {speed_grade} {timefailarg}",
--{architecture} --package {package} --speed {speed_grade} {timefailarg} {ignoreloops}",
"ecppack {build_name}.config --svf {build_name}.svf --bit {build_name}.bit"
]
def _build_script(source, build_template, build_name, architecture, package, speed_grade, timingstrict):
def _build_script(source, build_template, build_name, architecture, package, speed_grade, timingstrict, ignoreloops):
if sys.platform in ("win32", "cygwin"):
script_ext = ".bat"
script_contents = "@echo off\nrem Autogenerated by LiteX / git: " + tools.get_litex_git_revision() + "\n\n"
@ -135,6 +135,7 @@ def _build_script(source, build_template, build_name, architecture, package, spe
package = package,
speed_grade = speed_grade,
timefailarg = "--timing-allow-fail" if not timingstrict else "",
ignoreloops = "--ignore-loops" if ignoreloops else "",
fail_stmt = fail_stmt)
script_file = "build_" + build_name + script_ext
@ -180,6 +181,7 @@ class LatticeTrellisToolchain:
run = True,
nowidelut = False,
timingstrict = False,
ignoreloops = False,
**kwargs):
# Get default toolchain path (if not specified)
@ -215,7 +217,7 @@ class LatticeTrellisToolchain:
# Generate build script
script = _build_script(False, self.build_template, build_name, architecture, package,
speed_grade, timingstrict)
speed_grade, timingstrict, ignoreloops)
# Run
if run:
@ -234,9 +236,12 @@ def trellis_args(parser):
help="pass '-nowidelut' to yosys synth_ecp5")
parser.add_argument("--nextpnr-timingstrict", action="store_true",
help="fail if timing not met, i.e., do NOT pass '--timing-allow-fail' to nextpnr")
parser.add_argument("--nextpnr-ignoreloops", action="store_true",
help="ignore combinational loops in timing analysis, i.e. pass '--ignore-loops' to nextpnr")
def trellis_argdict(args):
return {
"nowidelut": args.yosys_nowidelut,
"timingstrict": args.nextpnr_timingstrict,
"ignoreloops": args.nextpnr_ignoreloops,
}