diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 80b4f9a..2f5352c 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -767,12 +767,31 @@
 
 	  If unsure, say N.
 
-config CMDLINE_BOOL
-	bool "Default bootloader kernel arguments"
+choice
+	prompt "Kernel command line"
+	optional
+	default CMDLINE_OVERWRITE
+	help
+	  Setting this option allows the kernel command line arguments
+	  to be set.
+
+config CMDLINE_OVERWRITE
+	bool "Overwrite bootloader kernel arguments"
+	help
+	  Given string will overwrite any arguments passed in by
+	  a bootloader.
+
+config CMDLINE_EXTEND
+	bool "Extend bootloader kernel arguments"
+	help
+	  Given string will be concatenated with arguments passed in
+	  by a bootloader.
+
+endchoice
 
 config CMDLINE
-	string "Initial kernel command string"
-	depends on CMDLINE_BOOL
+	string "Kernel command line arguments string"
+	depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND
 	default "console=ttySC1,115200"
 
 endmenu