Jacek Anaszewski <j.anaszewsk...@gmail.com> writes: >> These device tree comes from out firmware ... which is immutable . > > How the firmware is related to kernel? These bindings are for kernel, > not for the firmware. > > DT bindings are compiled to *.dtb file which is concatenated with > zImage. During system boot device drivers are matched with DT bindings > through 'compatible' property. A driver should have single matching DT > node, i.e. no other driver can probe with the same DT node. > This implies that the node should contain only the properties required > for configuring the related device.
For OPAL firmware on POWER, firmware hands kernel a flattened device tree of the machine it's booting on. It's not added to kernel as the kernels aren't board specific - they're generic. https://github.com/open-power/skiboot/ is the firmware that generates the device tree for booting under OPAL. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
