anchor.diff:  Chapter 6 describes device bindings for certain classes of devices and
   specific device types.
   
  -Chapter 7 describes ePAPR virtualization extensions-- hypercall ABI,
  +Chapter 7 describes {spec} virtualization extensions-- hypercall ABI,
   hypercall APIs, and device tree conventions related to virtualization.
   
   Chapter 8 specifies the physical structure of device trees.
  
positive.code: |R4 |0
  |R5 |0
  |R6 a|
  ePAPR magic value—to distinguish from non-ePAPR compliant firmware
  
  * For Book III-E CPUs shall be 0x45504150
  * For non-Book III-E CPUs shall be 0x65504150
  
negative.code: the client program to have hard-coded descriptions of system hardware.
  
  ==== 32-bit and 64-bit Support
  The {spec} supports CPUs with both 32-bit and 64-bit addressing
  capabilities. Where applicable, sections of the {spec} describe any
  requirements or considerations for 32-bit and 64-bit addressing.
  
  === References
  