diff --git a/firmware/system.c b/firmware/system.c
index bf112b6f6f..f02bbb821d 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -450,3 +450,16 @@ asm (
     "_UIE107:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
     "_UIE108:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
     "_UIE109:\tbsr\t_UIE\n\tmov.l\t@r15+,r4");
+
+void system_init(void)
+{
+    /* Disable all interrupts */
+    IPRA = 0;
+    IPRB = 0;
+    IPRC = 0;
+    IPRD = 0;
+    IPRE = 0;
+
+    /* NMI level low, falling edge on all interrupts */
+    ICR = 0;
+}
diff --git a/firmware/system.h b/firmware/system.h
index 7f7305f737..2947fdc1ab 100644
--- a/firmware/system.h
+++ b/firmware/system.h
@@ -261,5 +261,6 @@ static inline int cas2 (volatile int *pointer1,volatile int *pointer2,int reques
   }
 
 extern void system_reboot (void);
+extern void system_init(void);
 
 #endif