From b37698a06485f92e7200a8c0d613cb1f05f3562f Mon Sep 17 00:00:00 2001
From: Ian Martin <ian@locicontrols.com>
Date: Mon, 3 Nov 2014 14:15:52 -0500
Subject: [PATCH] cpu/cc2538: Enable the CC2538's more compact alternate
 interrupt mapping.

---
 cpu/cc2538/cpu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cpu/cc2538/cpu.c b/cpu/cc2538/cpu.c
index 87092a1df1..5e22d8af05 100644
--- a/cpu/cc2538/cpu.c
+++ b/cpu/cc2538/cpu.c
@@ -42,6 +42,9 @@ void cpu_init(void)
     /* configure the vector table location to internal flash */
     SCB->VTOR = FLASH_BASE;
 
+    /* Enable the CC2538's more compact alternate interrupt mapping */
+    SYS_CTRL->I_MAP = 1;
+
     /* initialize the clock system */
     cpu_clock_init();