arch/powerpc/booting.rst

1 .. SPDX-License-Identifier: GPL-2.0
4 ------------------
9 bootloader <-> kernel interfaces, in order to avoid the degeneration that had
14 merged architecture for ppc32 and ppc64, new 32-bit platforms and 32-bit
19 of a device-tree whose format is defined after Open Firmware specification.
21 doesn't require the device-tree to represent every device in the system and only
41         a) Boot from Open Firmware. If your firmware is compatible
42         with Open Firmware (IEEE 1275) or provides an OF compatible
47               bindings to powerpc. Only the 32-bit client interface
54               extract the device-tree and other information from open
55               firmware and build a flattened device-tree as described
56               in b). prom_init() will then re-enter the kernel using
58               context of the firmware, which is supposed to handle all
61         b) Direct entry with a flattened device-tree block. This entry
63         called directly by a bootloader that does not support the Open
64         Firmware client interface. It is also used by "kexec" to
67         details in this document, as method a) is simply standard Open
68         Firmware, and thus should be implemented according to the
72                 r3 : physical pointer to the device-tree block
78                 and a non-1:1 mapping.
82 Note about SMP entry: Either your firmware puts your other
92 given platform based on the content of the device-tree. Thus, you