[U-Boot] [PATCH] kbuild,tegra124: add dummy obj- for Kbuild

[Masahiro Yamada <yamada.m@jp.panasonic.com>]

Hello Tom,
(ccing Simon and Stephan)



> > Tom,
> > Please apply this along with the Kbuild series.
> 
> So with this, I then get:
> Configuring for venice2 board...
> make[2]: *** [arch/arm/dts/tegra124-venice2.dtb] Error 1
> make[1]: *** [dts/dt.dtb] Error 2
> make: *** [sub-make] Error 2
>    text    data     bss     dec     hex filename
>  260562   15030  309960  585552   8ef50 venice2/u-boot
>   18527     421      72   19020    4a4c venice2/spl/u-boot-spl
> 
> Device Tree Source is not correctly specified.
> Please define 'CONFIG_DEFAULT_DEVICE_TREE'
> or build with 'DEVICE_TREE=<device_tree>' argument
> 
> make[2]: *** [arch/arm/dts/tegra124-venice2.dtb] Error 1
> make[1]: *** [dts/dt.dtb] Error 2
> make: *** [sub-make] Error 2
> 
> --------------------- SUMMARY ----------------------------
> Boards compiled: 1
> Boards with errors: 1 ( venice2 )
> ----------------------------------------------------------
> 
> What's going on as the config file sets CONFIG_DEFAULT_DEVICE_TREE
> 



Commit 5ab502cb89 has been applied and the build system
now expects device tree sources should reside under arch/$(ARCH)/dts/.

But the device tree of venice2 board is still remaining
in board/nvidia/dts/.
This is the cause of the build error.
(Commit 5ab502cb89 had been posted before venice2 board
support was merged. So there happened an unvisible conflict.)

Actually I did not expect dts  series was applied so soon
because Simon and I was still discussing that series.
And I guess Simon is not happy about Commit 5ab502cb89.

Anyway, we need to do something with venice2's build error
immediately.

I think we have two options.

[1] Move also venice2 device tree to arch/arm/dts directory.
I have posted a patch:
http://patchwork.ozlabs.org/patch/322082/

[2] revert the following commits in this order
3284c8b8ca (dts: generate multiple device tree blobs)
5ab502cb89 (dts: move device tree sources to arch/$(ARCH)/dts/)


If we like to gather all device trees to arch/$(ARCH)/dts,
the choice will be [1].

On the other hand, if we like to put *.dtsi to arch/$(ARCH)/dts
whilst *.dts to board/$(VENDOR)/dts, the choice will be [2].



Best Regards
Masahiro Yamada