Add logic to avoid spurious interrupts

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1857 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/str71x/str71x_irq.c

@@ -87,6 +87,14 @@ void up_irqinitialize(void)
 
   putreg32(STR71X_EICICR_IRQEN, STR71X_EIC_ICR);
 
+  /* This shouldn't be necessary, but it appears that something is needed
+   * here to prevent spurious interrupts when the ARM interrupts are enabled
+   * (Needs more investigation).
+   */
+
+  putreg32(0, STR71X_EIC_IER);          /* Make sure that all interrupts are disabled */
+  putreg32(0xffffffff, STR71X_EIC_IPR); /* And that no interrupts are pending */
+
   /* Enable global ARM interrupts */
 
 #ifndef CONFIG_SUPPRESS_INTERRUPTS