--- /dev/null
+http://lists.denx.de/pipermail/u-boot/2012-April/122594.html
+http://patchwork.ozlabs.org/patch/159129/
+---
+
+diff --git a/include/ide.h b/include/ide.h
+index 8ecc9dd..385e909 100644
+--- a/include/ide.h
++++ b/include/ide.h
+@@ -24,7 +24,7 @@
+ #ifndef _IDE_H
+ #define _IDE_H
+
+-#define IDE_BUS(dev) (dev >> 1)
++#define IDE_BUS(dev) (dev / (CONFIG_SYS_IDE_MAXDEVICE / CONFIG_SYS_IDE_MAXBUS))
+
+ #define ATA_CURR_BASE(dev) (CONFIG_SYS_ATA_BASE_ADDR+ide_bus_offset[IDE_BUS(dev)])
+