From e59530ab50e10ec53a9d6d27e084541867ec0b21 Mon Sep 17 00:00:00 2001
From: Tim Callahan <tcal@google.com>
Date: Tue, 15 Jun 2021 14:49:28 -0700
Subject: [PATCH] Force SymbiFlow 'make' to be non-parallel.

Signed-off-by: Tim Callahan <tcal@google.com>
---
 litex/build/xilinx/symbiflow.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litex/build/xilinx/symbiflow.py b/litex/build/xilinx/symbiflow.py
index bbf7e5013..06124248d 100644
--- a/litex/build/xilinx/symbiflow.py
+++ b/litex/build/xilinx/symbiflow.py
@@ -73,7 +73,7 @@ class _MakefileGenerator:
 
 
 def _run_make():
-    make_cmd = ["make"]
+    make_cmd = ["make", "-j1"]
 
     if which("symbiflow_synth") is None:
         msg = "Unable to find Symbiflow toolchain, please:\n"