add fix for CPU hangs.

target/config/Config.in

@@ -371,7 +371,7 @@ config ADK_TARGET_CFLAGS
 	default "-march=amdfam10" if ADK_CPU_AMDFAM10
 	default "-mcpu=v8" if ADK_CPU_SPARC_V8
 	default "-m64 -mcpu=v9" if ADK_CPU_SPARC_V9
-	default "-march=loongson2f" if ADK_CPU_LOONGSON2F
+	default "-march=loongson2f -Wa,-mfix-loongson2f-nop" if ADK_CPU_LOONGSON2F
 	default "-march=mips32" if ADK_CPU_MIPS32
 	default "-march=mips64" if ADK_CPU_MIPS64
 	default "-march=armv5te -mtune=arm926ej-s" if ADK_CPU_ARMV5