boards/msba2: configure remaining UARTs

All UARTs on the MSBA2 are exposed through pin headers on the board.
Configure them according to the data sheet.

boards/msba2/include/periph_conf.h

@@ -87,10 +87,34 @@ static const uart_conf_t uart_config[] = {
         .pinsel_tx   = 0,
         .pinsel_msk_rx = BIT4,
         .pinsel_msk_tx = BIT6,
-    }
+    },
+    {
+        .dev = UART1,
+        .irq_prio_rx = 6,
+        .pinsel_rx   = 4,
+        .pinsel_tx   = 4,
+        .pinsel_msk_rx = BIT3,
+        .pinsel_msk_tx = BIT1,
+    },
+    {
+        .dev = UART2,
+        .irq_prio_rx = 6,
+        .pinsel_rx   = 0,
+        .pinsel_tx   = 0,
+        .pinsel_msk_rx = BIT22,
+        .pinsel_msk_tx = BIT20,
+    },
+    {
+        .dev = UART3,
+        .irq_prio_rx = 6,
+        .pinsel_rx   = 9,
+        .pinsel_tx   = 9,
+        .pinsel_msk_rx = BIT26 | BIT27,
+        .pinsel_msk_tx = BIT24 | BIT25,
+    },
 };
 
-#define UART_NUMOF          (1)
+#define UART_NUMOF          (4)
 /** @} */
 
 /**

cpu/lpc2387/periph/uart.c

@@ -100,7 +100,7 @@ static irq_fun_t _uart_isr[UART_NUMOF] = {
  * bits 0…3: DIVADDVAL
  * bits 4…7: MULVAL
  */
-#define DIV_MUL(m, d) ((d << 4) | m)
+#define DIV_MUL(d, m) ((m << 4) | d)
 static const uint8_t div_table[] = {
     DIV_MUL(0,  1),  /* 1       */
     DIV_MUL(0,  1),  /* 1.03125 */