diff --git a/configs/z16f2800100zcog/ostest/defconfig b/configs/z16f2800100zcog/ostest/defconfig
index bba24c16ec..20a1799df5 100644
--- a/configs/z16f2800100zcog/ostest/defconfig
+++ b/configs/z16f2800100zcog/ostest/defconfig
@@ -70,10 +70,9 @@ CONFIG_DRAM_SIZE=65536
 #   This specific the size of the receive buffer
 # CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
 #   being sent.  This specific the size of the transmit buffer
-# CONFIG_UARTn_BAUD - The configure BAUD of the UART.  Must be
-# CONFIG_UARTn_BITS - The number of bits.  Must be either 7 or 8.
+# CONFIG_UARTn_BAUD - The configure BAUD of the UART.
 # CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
-# CONFIG_UARTn_2STOP - Two stop bits
+# CONFIG_UARTn_2STOP - 0=1 stop bit; 1=Two stop bits
 #
 CONFIG_UART0_SERIAL_CONSOLE=y
 CONFIG_UART1_SERIAL_CONSOLE=n
@@ -83,8 +82,6 @@ CONFIG_UART0_RXBUFSIZE=256
 CONFIG_UART1_RXBUFSIZE=256
 CONFIG_UART0_BAUD=115200
 CONFIG_UART1_BAUD=115200
-CONFIG_UART0_BITS=8
-CONFIG_UART1_BITS=8
 CONFIG_UART0_PARITY=0
 CONFIG_UART1_PARITY=0
 CONFIG_UART0_2STOP=0
diff --git a/configs/z16f2800100zcog/src/z16f_lowinit.c b/configs/z16f2800100zcog/src/z16f_lowinit.c
index 02ee9daf61..439e9069e5 100644
--- a/configs/z16f2800100zcog/src/z16f_lowinit.c
+++ b/configs/z16f2800100zcog/src/z16f_lowinit.c
@@ -73,6 +73,11 @@ static void z16f_gpioinit(void)
   /* Configure Direction switch port */
 
   putreg8(getreg8(Z16F_GPIOC_DD) | 0x01, Z16F_GPIOC_DD);
+
+  /* Configure to use both UART0 and 1 */
+
+  putreg8(getreg8(Z16F_GPIOA_AFL) | 0x30, Z16F_GPIOA_AFL);
+  putreg8(getreg8(Z16F_GPIOD_AFL) | 0x30, Z16F_GPIOD_AFL);
 }
 
 /***************************************************************************