--- include/hw/ide/internal.h.orig	2017-11-19 18:54:05.000000000 -0700
+++ include/hw/ide/internal.h	2017-11-20 08:35:44.521365000 -0700
@@ -15,7 +15,7 @@
 #include "qapi/error.h"
 
 /* debug IDE devices */
-#define USE_DMA_CDROM
+// #define USE_DMA_CDROM
 
 typedef struct IDEBus IDEBus;
 typedef struct IDEDevice IDEDevice;