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reserved-memory device tree nodes
=================================
OPAL exposes reserved memory through a top-level reserved-memory node,
containing subnodes that represent each reserved memory region.
This follows the Linux specification for the /reserved-memory node,
described in the kernel source tree, in:
Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
The top-level /reserved-memory node contains: ::
#size-cells = <2>
#address-cells = <2>
Addresses and sizes are all 64-bits.
``ranges``
the empty ranges node indicates no translation of physical
addresses in the subnodes.
The sub-nodes under the /reserved-memory node contain:
``reg = <address size>``
the address and size of the reserved memory region. The address
and size values are two cells each, as signified by the top-level
``#{address,size}-cells``
``ibm,prd-label = "string"``
a string token for use by the prd system. Specific ranges may be
used by prd - those will be referenced by this label.
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