fix base adresses in sam3 devices with multiple sram blocks, add nfc section

ld/linker.ld.S

@@ -59,6 +59,9 @@ MEMORY
 #if defined(_XDRAM)
 	xdram (rw) : ORIGIN = _XDRAM_OFF, LENGTH = _XDRAM
 #endif
+#if defined(_NFCRAM)
+	nfcram (rw) : ORIGIN _NFCRAM_OFF, LENGTH = _NFCRAM
+#endif
 }
 
 /* Define sections. */
@@ -169,6 +172,13 @@ SECTIONS
 	} >xdram
 #endif
 
+#if defined(_NFCRAM)
+	.nfcram : {
+		*(.nfcram*)
+		. = ALIGN(4);
+	} >nfcram
+#endif
+
 	/*
 	 * The .eh_frame section appears to be used for C++ exception handling.
 	 * You may need to fix this if you're using C++.