did more changes to interrupt code, but still crashes in networking

dma/dma.c

@@ -665,6 +665,7 @@ void *dma_memcpy(void *dst, void *src, size_t n)
 
 int dma_init(void)
 {
+    int i;
     int res;
 
     dbg("MCD DMA API initialization: ");
@@ -675,6 +676,15 @@ int dma_init(void)
         return 0;
     }
 
+    /*
+     * make sure dma_channel array is properly initialized
+     */
+    for (i = 0; i < NCHANNELS; i++)
+    {
+        dma_channel[i].req = -1;
+        dma_channel[i].handler = NULL;
+    }
+
     // test
     dma_memcpy((void *) 0x10000, (void *) 0x03e00000, 0x00100000);  /* copy one megabyte of flash to RAM */