[PATCH v2] BaseTools/Conf: 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 +-
 BaseTools/Conf/tools_def.template  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/BaseTools/Conf/build_rule.template b/BaseTools/Conf/build_rule.template
index 3e6aa8ff0f34..a5e471eb3c10 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)" $(DTC_FLAGS) -I dts -O dtb -o ${dst} ${d_path}(+)${s_base}.i
 
 [Visual-Form-Representation-File]
     <InputFile>
diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index 482ef263c274..99ad271471d9 100755
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -4467,6 +4467,7 @@ NOOPT_DDK3790xASL_IPF_DLINK_FLAGS    = /NOLOGO /NODEFAULTLIB /LTCG /DLL /OPT:REF
 DEBUG_*_*_OBJCOPY_ADDDEBUGFLAG     = --add-gnu-debuglink=$(DEBUG_DIR)/$(MODULE_NAME).debug
 RELEASE_*_*_OBJCOPY_ADDDEBUGFLAG   =
 NOOPT_*_*_OBJCOPY_ADDDEBUGFLAG     = --add-gnu-debuglink=$(DEBUG_DIR)/$(MODULE_NAME).debug
+*_*_*_DTC_FLAGS                    = -H epapr
 
 DEFINE GCC_ALL_CC_FLAGS            = -g -Os -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -include AutoGen.h -fno-common
 DEFINE GCC_IA32_CC_FLAGS           = DEF(GCC_ALL_CC_FLAGS) -m32 -malign-double -freorder-blocks -freorder-blocks-and-partition -O2 -mno-stack-arg-probe
-- 
2.11.0