uart0: serial {compatible = "sandbox,serial";u-boot,dm-pre-reloc;Shouldn't that be handled by the driver. It's certainly something that's only relevant to the internals of U-Boot, and hence inappropriate to put into DT.
Hence the u-boot prefix. This is described in the driver model docs. I have found a work-around (which forces a driver to be inited pre-reloc if none is found) but I'm not 100% happy with it.
I'm arguing that the property shouldn't exist in DT at all. DT is supposed to be a pure description of the HW, and not encode details that are specific to the implementation of particular SW. The fact that U-Boot performs relocation of its code during boot is completely irrelevant to a HW description.
As such, the issue isn't whether there is a u-boot, prefix on that property, but whether it's there at all.
Right. And I've arguing that U-Boot should use exactly the same descriptions that are in the Kernel even. Those DTS descriptions should be common, applicable to both or neither, exactly because they do describe the HW and are agnostic WRT the SW that is using them.
HTH, jdl