diff --git a/os/hal/boards/ST_EVB_SPC563M/board.h b/os/hal/boards/ST_EVB_SPC563M/board.h
index 4b31cf598..58f718991 100644
--- a/os/hal/boards/ST_EVB_SPC563M/board.h
+++ b/os/hal/boards/ST_EVB_SPC563M/board.h
@@ -37,12 +37,12 @@
 /*
  * I/O definitions.
  */
-#define P5_ESCI_A_TX                9
-#define P5_ESCI_A_RX                10
+#define P5_ESCI_A_TX                3	/* SCI_A_TX==GPIO[83] */
+#define P5_ESCI_A_RX                4	/* SCI_A_RX==GPIO[84] */
 #define P11_BUTTON1                 3
 #define P11_BUTTON2                 5
 #define P11_BUTTON3                 7
-#define P11_BUTTON4                 9
+#define P11_BUTTON4                 11  /* GPIO[187] */
 #define P11_LED1                    12
 #define P11_LED2                    13
 #define P11_LED3                    14
diff --git a/readme.txt b/readme.txt
index 53a10ae03..8a7001242 100644
--- a/readme.txt
+++ b/readme.txt
@@ -95,6 +95,8 @@
        MEMS Accelerometers.
 - NEW: Safer messages mechanism for sandboxes (to be backported to 20.3.1).
 - NEW: Added latency measurement test application.
+- FIX: Fixed wrong definitions in SPC563M board files (bug #1108)
+       (backported to 20.3.2)(backported to 19.1.5).
 - FIX: Fixed cortex-M vectors table alignment problem (bug #1107)
        (backported to 20.3.2)(backported to 19.1.5).
 - FIX: Fixed extra condition in MAC driver macWaitTransmitDescriptor() function