[PATCH] BaseTools/build_rule: disable DTC legacy phandle format

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

By default, the device tree compiler emits phandle properties twice:
one called 'phandle' and another called 'linux,phandle'. Given that
Linux was updated in early 2010 [0] to accept the former (which is
what is specified in the ePAPR and device tree specifications), there
is no point in emitting both when compiling device trees for UEFI
platforms.

[0] 04b954a673dd02f585a2769c4945a43880faa989
    "of/flattree: Make the kernel accept ePAPR style phandle information"

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 BaseTools/Conf/build_rule.template | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/BaseTools/Conf/build_rule.template b/BaseTools/Conf/build_rule.template
index 3e6aa8ff0f34..10a91fe3a6c6 100755
--- a/BaseTools/Conf/build_rule.template
+++ b/BaseTools/Conf/build_rule.template
@@ -250,7 +250,7 @@
 
     <Command.GCC>
         "$(PP)" $(DTCPP_FLAGS) $(INC) ${src} > ${d_path}(+)${s_base}.i
-        "$(DTC)" -I dts -O dtb -o ${dst} ${d_path}(+)${s_base}.i
+        "$(DTC)" -H epapr -I dts -O dtb -o ${dst} ${d_path}(+)${s_base}.i
 
 [Visual-Form-Representation-File]
     <InputFile>
-- 
2.11.0