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Diffstat (limited to 'doc/opal-api/opal-get-device-tree-118.txt')
| -rw-r--r-- | doc/opal-api/opal-get-device-tree-118.txt | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/doc/opal-api/opal-get-device-tree-118.txt b/doc/opal-api/opal-get-device-tree-118.txt new file mode 100644 index 0000000..235a321 --- /dev/null +++ b/doc/opal-api/opal-get-device-tree-118.txt @@ -0,0 +1,24 @@ +OPAL_GET_DEVICE_TREE +-------------------- + +Get device sub-tree + +Parameters: + 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 + +Calling: + +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 |