diff --git a/board/taskit/stamp9g20/stamp9g20.c b/board/taskit/stamp9g20/stamp9g20.c
index 5e07bf8d4e..06df0af06f 100644
--- a/board/taskit/stamp9g20/stamp9g20.c
+++ b/board/taskit/stamp9g20/stamp9g20.c
@@ -159,15 +159,28 @@ int board_early_init_f(void)
 	return 0;
 }
 
+int board_postclk_init(void)
+{
+	/*
+	 * Initialize the serial interface here, because be need a running
+	 * timer to set PC9 to high and wait for some time to enable the
+	 * level converter of the RS232 interface on the PortuxG20 board.
+	 */
+
+#ifdef CONFIG_PORTUXG20
+	at91_set_gpio_output(AT91_PIN_PC9, 1);
+	mdelay(1);
+#endif
+	at91_seriald_hw_init();
+
+	return 0;
+}
+
 int board_init(void)
 {
 	/* Adress of boot parameters */
 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
 
-	/* Enable the serial interface */
-	at91_set_gpio_output(AT91_PIN_PC9, 1);
-	at91_seriald_hw_init();
-
 	stamp9G20_nand_hw_init();
 #ifdef CONFIG_MACB
 	stamp9G20_macb_hw_init();
diff --git a/include/configs/stamp9g20.h b/include/configs/stamp9g20.h
index a2a0156a65..a881eef300 100644
--- a/include/configs/stamp9g20.h
+++ b/include/configs/stamp9g20.h
@@ -59,6 +59,7 @@
 #define CONFIG_INITRD_TAG		/* pass initrd param to kernel */
 #define CONFIG_SKIP_LOWLEVEL_INIT	/* U-Boot is loaded by a bootloader */
 #define CONFIG_BOARD_EARLY_INIT_f	/* call board_early_init_f() */
+#define CONFIG_BOARD_POSTCLK_INIT	/* call board_postclk_init() */
 #define CONFIG_DISPLAY_CPUINFO		/* display CPU Info at startup */
 
 /* setting board specific options */