diff --git a/docker/boot.ini.template b/docker/boot.ini.template
index 8f8842e..c1cf820 100644
--- a/docker/boot.ini.template
+++ b/docker/boot.ini.template
@@ -35,6 +35,8 @@ show cpu iospace
 
 ; Configure all csr/vector
 set cpu autoconfig
+; Don't spin CPU
+set cpu idle
 ; Change DZ vector
 set dz vector=310
 ; boot it