soc_core: convert cpu_type="None" string to None

diff --git a/litex/soc/integration/soc_core.py b/litex/soc/integration/soc_core.py
index 8e91d31c1b181f05cec980926128330787e4b71e..9cf3ea061d8efc105834f7846ce5ef0000c9110e 100644 (file)
--- a/litex/soc/integration/soc_core.py
+++ b/litex/soc/integration/soc_core.py
@@ -124,6 +124,8 @@ class SoCCore(Module):
         self.platform = platform
         self.clk_freq = clk_freq
 
+        if cpu_type == "None":
+            cpu_type = None
         self.cpu_type = cpu_type
         self.cpu_variant = cpu_variant
         if integrated_rom_size: