The best way to understand how the wii u works is to know the format of their partitions. I'm not sure about this but i see "Checks CPU status register WPAR, which indicates if partial contents are present" in cafe sdk.
a link about this:
http://www.ibm.com/developerworks/aix/library/au-wpar61aix/index.html
sorry for my poor english....
a link about this:
http://www.ibm.com/developerworks/aix/library/au-wpar61aix/index.html
sorry for my poor english....