diff --git a/[refs] b/[refs]
index 77d25af82524..701bc37d75d3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 17916b284e6afea210484e4c2688debb8c9641c2
+refs/heads/master: 4f5ef9226afab7c9920f1e6c560f046f6aaba89c
diff --git a/trunk/arch/arm/Kconfig.debug b/trunk/arch/arm/Kconfig.debug
index 11604c9e55e0..60d184677955 100644
--- a/trunk/arch/arm/Kconfig.debug
+++ b/trunk/arch/arm/Kconfig.debug
@@ -65,13 +65,18 @@ config DEBUG_USER
 
 # These options are only for real kernel hackers who want to get their hands dirty.
 config DEBUG_LL
-	bool "Kernel low-level debugging functions"
+	bool "Kernel low-level debugging functions (read help!)"
 	depends on DEBUG_KERNEL
 	help
 	  Say Y here to include definitions of printascii, printch, printhex
 	  in the kernel.  This is helpful if you are debugging code that
 	  executes before the console is initialized.
 
+	  Note that selecting this option will limit the kernel to a single
+	  UART definition, as specified below. Attempting to boot the kernel
+	  image on a different platform *will not work*, so this option should
+	  not be enabled for kernels that are intended to be portable.
+
 choice
 	prompt "Kernel low-level debugging port"
 	depends on DEBUG_LL