diff --git a/arch/xtensa/src/common/xtensa_abi.h b/arch/xtensa/src/common/xtensa_abi.h
index 8c740d49db..db5ab5d552 100644
--- a/arch/xtensa/src/common/xtensa_abi.h
+++ b/arch/xtensa/src/common/xtensa_abi.h
@@ -71,13 +71,13 @@
  *   always passed in an even/odd register pair even if that means to omit a
  *   register for alignment. The return values are stored in a2 through a7.
  *
- *             return addr  stack ptr       arg0, arg1, arg2, arg3, arg4, arg5
- *             -----------  ---------       ----------------------------------
- *               a0           a1              a2,   a3,   a4,   a5,   a6,   a7
+ *          return addr  stack ptr  arg0, arg1, arg2, arg3, arg4, arg5
+ *          -----------  ---------  ----------------------------------
+ *            a0           a1         a2,   a3,   a4,   a5,   a6,   a7
  *
- *   call4       a4           a5              a6,   a7,   a8,   a9,  a10,  a11
- *   call8       a8           a9             a10,  a11,  a12,  a13,  a14,  a15
- *   call12     a12          a13             a14,  a15   ---   ---   ---   ---
+ *   call4    a4           a5         a6,   a7,   a8,   a9,  a10,  a11
+ *   call8    a8           a9        a10,  a11,  a12,  a13,  a14,  a15
+ *   call12  a12          a13        a14,  a15   ---   ---   ---   ---
  *
  *   The stack pointer SP should only be modified by ENTRY and MOVSP
  *   instructions (except for initialization and restoration). If some other
diff --git a/arch/xtensa/src/esp32/esp32_serial.c b/arch/xtensa/src/esp32/esp32_serial.c
index 36c66dcc09..415dd102bb 100644
--- a/arch/xtensa/src/esp32/esp32_serial.c
+++ b/arch/xtensa/src/esp32/esp32_serial.c
@@ -1268,7 +1268,7 @@ int up_putc(int ch)
       /* Add CR */
 
       while(!esp32_txready(&CONSOLE_DEV));
-      esp32_send(&CONSOLE_DEV, 'r');
+      esp32_send(&CONSOLE_DEV, '\r');
     }
 
   while(!esp32_txready(&CONSOLE_DEV));