with that address (if any).
The default include/asm-ppc64/io.h macros readb(), inb(), insb(),
-etc. include a check to see if the the i/o read returned all-0xff's.
+etc. include a check to see if the i/o read returned all-0xff's.
If so, these make a call to eeh_dn_check_failure(), which in turn
asks the firmware if the all-ff's value is the sign of a true EEH
error. If it is not, processing continues as normal. The grand