On Wed, Sep 5, 2018 at 6:27 PM Scott Branden <scott.bran...@broadcom.com> wrote: > > > > On 18-09-05 02:40 AM, Ard Biesheuvel wrote: > > On 4 September 2018 at 19:19, Scott Branden <scott.bran...@broadcom.com> > > wrote: > >> Rather than introduce EFI_ARMSTUB_DTB_LOADER, why not have > >> the efistub use CONFIG_OF to determine whether it supports dtb= or not? > >> > >> That way ACPI-only distros disable devicetree support entirely. > >> > > Unfortunately, CONFIG_OF cannot be disabled on arm64 even on ACPI-only > > builds. > OF shouldn't be automatically selected in the arm64/Kconfig. It should > have a config > parmaeter like other archs as mips and arm. I can submit a patch so it > functions the > same way as other archs so it is not always selected. It will be good > to add a USE_OF > config options like the other archs (or simply remove the select from > the Kconfig and choose OF directly in the defconfig. > This will have the added benefit of doing away with OF support when its > not needed on an ARM64 platform. ACPI is already not automatically > selected for all ARM64 platforms, nor should devicetree.
We don't do that on Arm because a devicetree is always required at boot time. Even on ACPI systems a tiny DTB is used containing just a /chosen node for passing the kernel command line and the initrd location. g. g.
