use __SAMD51__ macro for io.h

hathach · hathach · commit 2568b782137e · 2019-07-17T14:26:48.000+07:00
diff --git a/cores/arduino/avr/io.h b/cores/arduino/avr/io.h
@@ -25,7 +25,7 @@
 #ifndef _IO_H_
 #define _IO_H_
 
-#ifdef HSRAM_ADDR
+#ifdef __SAMD51__
   #define RAMSTART (HSRAM_ADDR)
   #define RAMSIZE  (HSRAM_SIZE)
 #else
