linux-kernel - Re: [PATCH v2 2/9] nios2: build .dtb files in dts directory

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Date:   Wed, 12 Sep 2018 11:18:22 +0800
From:   Ley Foon Tan <ley.foon.tan@...el.com>
To:     Rob Herring <robh@...nel.org>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        nios2-dev@...ts.rocketboards.org
Subject: Re: [PATCH v2 2/9] nios2: build .dtb files in dts directory

On Fri, 2018-09-07 at 13:09 -0500, Rob Herring wrote:
> On Thu, Sep 6, 2018 at 9:21 PM Ley Foon Tan <ley.foon.tan@...el.com>
> wrote:
> > 
> > 
> > On Wed, 2018-09-05 at 18:53 -0500, Rob Herring wrote:
> > > 
> > > Align nios2 with other architectures which build the dtb files in
> > > the
> > > same directory as the dts files. This is also in line with most
> > > other
> > > build targets which are located in the same directory as the
> > > source.
> > > This move will help enable the 'dtbs' target which builds all the
> > > dtbs
> > > regardless of kernel config.
> > > 
> > > This transition could break some scripts if they expect dtb files
> > > in
> > > the old location.
> > > 
> > > Cc: Ley Foon Tan <lftan@...era.com>
> > > Cc: nios2-dev@...ts.rocketboards.org
> > > Signed-off-by: Rob Herring <robh@...nel.org>
> > > ---
> > > Please ack so I can take the whole series via the DT tree.
> > > 
> > >  arch/nios2/Makefile          | 4 ++--
> > >  arch/nios2/boot/Makefile     | 4 ----
> > >  arch/nios2/boot/dts/Makefile | 1 +
> > >  3 files changed, 3 insertions(+), 6 deletions(-)
> > >  create mode 100644 arch/nios2/boot/dts/Makefile
> > > 
> > > diff --git a/arch/nios2/Makefile b/arch/nios2/Makefile
> > > index 8673a79dca9c..50eece1c6adb 100644
> > > --- a/arch/nios2/Makefile
> > > +++ b/arch/nios2/Makefile
> > > @@ -59,10 +59,10 @@ archclean:
> > >         $(Q)$(MAKE) $(clean)=$(nios2-boot)
> > > 
> > >  %.dtb: | scripts
> > > -       $(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
> > > +       $(Q)$(MAKE) $(build)=$(nios2-boot)/dts $(nios2-
> > > boot)/dts/$@
> > > 
> > >  dtbs:
> > > -       $(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
> > > +       $(Q)$(MAKE) $(build)=$(nios2-boot)/dts
> > > 
> > >  $(BOOT_TARGETS): vmlinux
> > >         $(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
> > > diff --git a/arch/nios2/boot/Makefile b/arch/nios2/boot/Makefile
> > > index 2ba23a679732..007586094dde 100644
> > > --- a/arch/nios2/boot/Makefile
> > > +++ b/arch/nios2/boot/Makefile
> > > @@ -47,10 +47,6 @@ obj-$(CONFIG_NIOS2_DTB_SOURCE_BOOL) +=
> > > linked_dtb.o
> > > 
> > >  targets += $(dtb-y)
> > > 
> > > -# Rule to build device tree blobs with make command
> > > -$(obj)/%.dtb: $(src)/dts/%.dts FORCE
> > > -       $(call if_changed_dep,dtc)
> > > -
> > >  $(obj)/dtbs: $(addprefix $(obj)/, $(dtb-y))
> > > 
> > >  install:
> > > diff --git a/arch/nios2/boot/dts/Makefile
> > > b/arch/nios2/boot/dts/Makefile
> > > new file mode 100644
> > > index 000000000000..f66554cd5c45
> > > --- /dev/null
> > > +++ b/arch/nios2/boot/dts/Makefile
> > > @@ -0,0 +1 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > > --
> > > 2.17.1
> > > 
> > Hi Rob
> > 
> > I have synced your all-dtbs branch from here: https://git.kernel.or
> > g/pu
> > b/scm/linux/kernel/git/robh/linux.git/log/?h=all-dtbs
> > 
> > It shows error when compile kernel image and also when "make
> > dtbs_install".
> Can you fetch the branch again and try it. I fixed a few dependency
> issues.
> 
> > 
> > make dtbs_install
> > make[1]: *** No rule to make target
> > 'arch/nios2/boot/dts/arch/nios2/boot/dts/10m50_devboard.dtb',
> > needed by
> > 'arch/nios2/boot/dts/arch/nios2/boot/dts/10m50_devboard.dtb.S'.  St
> > op.
> What is the value of CONFIG_NIOS2_DTB_SOURCE? As patch 3 notes, it
> now
> should not have any path.
> 
> If that's a problem, I could take the basename to strip the path, but
> then sub directories wouldn't work either.
> 
> BTW, next up, I want to consolidate the config variables for built-in 
> dtbs.
> 

Hi Rob

CONFIG_NIOS2_DTB_SOURCE has the relative path to dts file,
arch/nios2/boot/dts/arch/nios2/boot/dts/10m50_devboard.dts

Change CONFIG_NIOS2_DTB_SOURCE=10m50_devboard.dtb.S fix the dtb build
issue.


Regards
Ley Foon