Using write() for output for better portability

bsp_z7/newlib/write.c

@@ -0,0 +1,15 @@
+#include "xil_printf.h"
+#include "xparameters.h"
+
+int write(int file, char *ptr, int len) {
+  if (ptr == NULL) {
+    return 0;
+  }
+  // TODO file descriptors
+  int todo;
+
+  for (todo = 0; todo < len; todo++) {
+    outbyte(*ptr++);
+  }
+  return len;
+}