OPAL_GET_DEVICE_TREE

#define OPAL_GET_DEVICE_TREE                 118

int64_t opal_get_device_tree(uint32_t phandle, uint64_t buf, uint64_t len);

Get device sub-tree.

uint32_t phandle

root device node phandle of the device sub-tree

uint64_t buf

FDT blob buffer or NULL

uint64_t len

length of the FDT blob buffer

Retrieve device sub-tree. The root node’s phandle is identified by @phandle. The typical use is for the kernel to update its device tree following a change in hardware (e.g. PCI hotplug).

Return Codes

FDT blob size

returned FDT blob buffer size when buf is NULL

OPAL_SUCCESS

FDT blob is created successfully

OPAL_PARAMETER

invalid argument @phandle or @len

OPAL_INTERNAL_ERROR

failure creating FDT blob when calculating its size

OPAL_NO_MEM

not enough room in buffer for device sub-tree

OPAL_EMPTY

failure creating FDT blob