* For pSeries or server processors:
* 1. The MMU is off & open firmware is running in real mode.
* 2. The kernel is entered at __start
+ * -or- For OPAL entry:
+ * 1. The MMU is off, processor in HV mode, primary CPU enters at 0
+ * with device-tree in gpr3
+ * 2. Secondary processors enter at 0x60 with PIR in gpr3
*
* For iSeries:
* 1. The MMU is on (as it always is for iSeries)