Changes since U-Boot 1.1.4:
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+* Prevent USB commands from working when USB is stopped.
+
+* Add rudimentary handling of alternate settings of USB interfaces.
+ This is in order to fix issues with some USB sticks timing out
+ during initialization. Some code readability improvements.
+
* PPC440 DDR setup: Set SDRAM0_CFG0[PMU]=0 for best performance
AMCC suggested to set the PMU bit to 0 for best performace on
the PPC440 DDR controller.