A10: Make sure that interrupts are disabled and cleared

arch/arm/src/a1x/a1x_boot.c

@@ -98,7 +98,7 @@ extern uint32_t _vector_end;   /* End+1 of vector block */
 #ifndef CONFIG_ARCH_ROMPGTABLE
 static const struct section_mapping_s section_mapping[] =
 {
-  { A1X_INTMEM_PSECTION,  A1X_INTMEM_VSECTION,
+  { A1X_INTMEM_PSECTION,  A1X_INTMEM_VSECTION,  /* Includes vectors and page table */
     A1X_INTMEM_MMUFLAGS,  A1X_INTMEM_NSECTIONS
   },
   { A1X_PERIPH_PSECTION,  A1X_PERIPH_VSECTION,

arch/arm/src/a1x/a1x_irq.c

@@ -148,12 +148,22 @@ static void a1x_dumpintc(const char *msg, int irq)
 
 void up_irqinitialize(void)
 {
+  int i;
 
   /* The following operations need to be atomic, but since this function is
    * called early in the initialization sequence, we expect to have exclusive
    * access to the INTC.
    */
 
+  /* Disable, mask, and clear all interrupts */
+
+  for (i = 0; i < A1X_IRQ_NINT; i += 32)
+    {
+      putreg32(0x00000000, A1X_INTC_EN(i));   /* 0 disables corresponding interrupt */
+      putreg32(0xffffffff, A1X_INTC_MASK(i)); /* 1 masks corresponding interrupt */
+      (void)getreg32(A1X_INTC_IRQ_PEND(i));   /* Reading status clears pending interrupts */
+    }
+
   /* Colorize the interrupt stack for debug purposes */
 
 #if defined(CONFIG_DEBUG_STACK) && CONFIG_ARCH_INTERRUPTSTACK > 3