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:
The top-level /reserved-memory node contains:
#size-cells = <2> #address-cells = <2>
Addresses and sizes are all 64-bits.
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
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.