first version of working cmake

env/iss/CMakeLists.txt

@@ -1,3 +1,7 @@
+#cmake_minimum_required(VERSION 3.12)
+project(iss)
+message(STATUS " here in iss")
+
 # Create library for ISS board support
 add_library(board_iss STATIC
     init.c

env/iss/write.c

@@ -0,0 +1,38 @@
+/* See LICENSE of license details. */
+
+#include <errno.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "platform.h"
+#include "stub.h"
+#include "weak_under_alias.h"
+#if defined(SEMIHOSTING)
+#include "semihosting.h"
+#endif
+
+ssize_t __wrap_write(int fd, const void *ptr, size_t len) {
+  const uint8_t *current = (const uint8_t *)ptr;
+#if defined(SEMIHOSTING)
+  if (isatty(fd)) {
+    for (size_t jj = 0; jj < len; jj++) {
+      sh_writec(current[jj]);
+    }
+    return len;
+  } else {
+    sh_write(current, fd);
+    return len;
+  }
+  // return len;
+#endif
+  if (isatty(fd)) {
+    for (size_t jj = 0; jj < len; jj++) {
+      *((uint32_t *)0xFFFF0000) = current[jj];
+    }
+    return len;
+  }
+
+  return _stub(EBADF);
+}
+weak_under_alias(write);