Re: [ptxdist] dts target: How do I pass a device tree include directory?

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

On Mon, Feb 27, 2017 at 01:46:09PM +0000, Dörfler Florian wrote:
> I try to compile a device tree from sources that are lying in the barebox
> tree. The device tree uses #includes and #defines that should be processed by
> the CPP. When I run the dtc.targetinstall step, I get the following error:
> 
> --------------------
> target: imx6-foo.dtb
> --------------------
> 
> CPP ptxdist_project/platform-foo/state/imx6-foo.dts.tmp
> /bar/ptxdist_project/platform-foo/build-target/barebox/arch/arm/dts/imx6-foo.dts:14:26: fatal error: arm/imx6q.dtsi: No such file or directory
>  #include <arm/imx6q.dtsi>
>                           ^
> compilation terminated.
> 
> The path arm/imx6q.dtsi is under a different include directory: /bar/ptxdist_project/platform-foo/build-target/barebox/dts/src
> 
> I added the include path both like so:
> PTXCONF_DTC_OFTREE_DTS_PATH=${BAREBOX_DIR}/arch/arm/dts:${BAREBOX_DIR}/dts/src
> And so:
> DTC_EXTRA_ARGS=-i ${BAREBOX_DIR}/dts/src
> 
> But the former only seems to be used to search for the .dts file and the latter is only passed to dtc, not the preprocessor that runs before it. I looked at the cpp command invocation that causes the problem:
>     cpp \
> 	-Wp,-MD,${tmp_deps} \
> 	-Wp,-MT,${tmp_dts} \
> 	-nostdinc \
> 	${no_linemarker} \
> 	-I$(dirname "${dts}") \
> 	-I${dts_kernel_dir}/arch/${dts_kernel_arch}/boot/dts \
> 	-I${dts_kernel_dir}/arch/${dts_kernel_arch}/boot/dts/include \
> 	-I${dts_kernel_dir}/drivers/of/testcase-data \
> 	-I${dts_kernel_dir}/include \
> 	-undef -D__DTS__ -x assembler-with-cpp \
> 	-o ${tmp_dts} \
> 	${dts} &&
> 
> Which only seems really work for device trees that are stored in the kernel
> source tree (or need no include directories). So is it currently not possible
> to use custom include directories for the device tree or do I go about it the
> wrong way?

This is not supported. You could change the commandline with a custom
version of scripts/lib/ptxd_make_dts_dtc.sh in your BSP but then you may
run into dependency problems. This is only intended to work with the
kernel.

Michael

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