Integrate flaterm terminal

kernel/std/string.c

@@ -0,0 +1,10 @@
+#include <stddef.h>
+#include "hal/hal.h"
+
+void *memset(void *p, int c, size_t n) {
+  return hal_memset(p,c,n);
+}
+
+void *memcpy(void *dst, const void *src, size_t n) {
+  return hal_memcpy(dst,src,n);
+}