Delay enabling UART1 until after LPC bus is enabled.

BUG=none
TEST=manual

Try it on a bds with no LPC bus. It gets a BusFault without this patch.

Change-Id: If3f38df5f7bebaf4c7045a9f48fbe3ac66e8bdbf

chip/lm4/uart.c

@@ -179,8 +179,20 @@ int uart_init(void)
 		LM4_UART_CTL(ch) |= 0x0001;
 	}
 
-	/* Enable interrupts */
+	/* Enable interrupts for UART0 only. UART1 will have to wait until the
+	 * LPC bus is initialized.
+	 */
 	task_enable_irq(LM4_IRQ_UART0);
+
+	return EC_SUCCESS;
+}
+
+
+/*****************************************************************************/
+/* COMx functions */
+
+void uart_comx_enable(void)
+{
 	task_enable_irq(LM4_IRQ_UART1);
 
 	/* Print hello on UART1 for debugging */
@@ -190,12 +202,8 @@ int uart_init(void)
 		while (*c)
 			uart_comx_putc(*c++);
 	}
-
-	return EC_SUCCESS;
 }
 
-/*****************************************************************************/
-/* COMx functions */
 
 int uart_comx_putc_ok(void)
 {

common/main.c

@@ -74,6 +74,7 @@ int main(void)
 #ifdef CONFIG_LPC
 	port_80_init();
 	lpc_init();
+	uart_comx_enable();
 #endif
 #ifdef CONFIG_PWM
 	pwm_init();

include/uart.h

@@ -173,6 +173,9 @@ void uart_process(void);
 /*****************************************************************************/
 /* COMx functions */
 
+/* Enables comx interrupts */
+void uart_comx_enable(void);
+
 /* Returns non-zero if ok to put a character via uart_comx_putc(). */
 int uart_comx_putc_ok(void);