set dram_clk_freq to None

diff --git a/src/ls2.py b/src/ls2.py
index 87f6963102dd6f75dc0d7f7d3a20346c50b6258c..0e72d473740a531f529bfc4e4313fda446f79ff5 100644 (file)
--- a/src/ls2.py
+++ b/src/ls2.py
@@ -876,7 +876,6 @@ def build_platform(fpga, firmware):
         clk_freq = 40.0e6
     if fpga == 'orangecrab':
         clk_freq = 50e6
-        dram_clk_freq = 50e6
 
     # merge dram_clk_freq with clk_freq if the same
     if clk_freq == dram_clk_freq: