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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree/reserved-memory.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/device-tree/reserved-memory.txt b/doc/device-tree/reserved-memory.txt new file mode 100644 index 0000000..0f6002d --- /dev/null +++ b/doc/device-tree/reserved-memory.txt @@ -0,0 +1,27 @@ +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 + |