Merge pull request #339 from yosinski/master

Add .ramfunc attribute to flash_with_bootloader.ld to enable keeping functions in RAM

variants/feather_m4/linker_scripts/gcc/flash_with_bootloader.ld

@@ -170,6 +170,10 @@ SECTIONS
 		KEEP(*(.fini_array))
 		PROVIDE_HIDDEN (__fini_array_end = .);
 
+		. = ALIGN(4);
+		/* Keep .ramfunc functions in RAM */
+		KEEP(*(.ramfunc))
+
 		KEEP(*(.jcr*))
 		. = ALIGN(16);
 		/* All data end */