diff --git a/arm.ld b/arm.ld
index d052d805..ad3ab1ad 100644
--- a/arm.ld
+++ b/arm.ld
@@ -2,7 +2,7 @@
 MEMORY
 {
     FLASH_TEXT (rw) : ORIGIN = 0x00000000, LENGTH = 256K /* .text */
-    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 16K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 64K
 }
 
 _stack_size = 2K;
diff --git a/src/examples/hello/hello.go b/src/examples/hello/hello.go
index 489aff22..592b239e 100644
--- a/src/examples/hello/hello.go
+++ b/src/examples/hello/hello.go
@@ -1,5 +1,7 @@
 package main
 
+import "unicode"
+
 type Thing struct {
 	name string
 }
@@ -46,6 +48,9 @@ func main() {
 	println("Stringer.String():", s.String())
 
 	runFunc(hello, 5) // must be indirect to avoid obvious inlining
+
+	// test library functions
+	println("lower to upper char:", 'h', "->", unicode.ToUpper('h'))
 }
 
 func runFunc(f func(int), arg int) {