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Use the ARM64 kernel booting register settings, defined in Linux documentation Documentation/arch/arm64/booting.rst: x0 = physical address of device tree blob (dtb) in system RAM. so kernel can replace U-Boot in FIP without modification of BL31. Use x0 for future TF-A version and keep x2 as fallback to be compatible with previous version of TF-A BL31. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>