[U-Boot] [PATCH 1/2] kbuild: make arch-dtbs target PHONY

[Stephen Warren]

On 2/26/19 7:36 PM, Masahiro Yamada wrote:
> On Wed, Feb 27, 2019 at 11:17 AM Masahiro Yamada
> <yamada.masahiro at socionext.com> wrote:
>>
>> On Wed, Feb 27, 2019 at 4:21 AM Stephen Warren <swarren at wwwdotorg.org> wrote:
>>>
>>> From: Stephen Warren <swarren at nvidia.com>
>>>
>>> Without this, the arch-dtbs target only gets evaluated when building
>>> U-Boot the first time, not when re-building (incrementally building)
>>> U-Boot. Thus incremental builds ignore changes to DTB files.
>>
>>
>> Really?
>>
>> I tested "touch DT, then incremental build",
>> and it correctly re-compiled device tree.
>>
>>
>> I attached the log of the following build sequence:
>>
>> [1] make jetson-tk1_defconfig
>> [2] make CROSS_COMPILE=arm-linux-gnueabihf-
>> [3] touch  arch/arm/dts/tegra124-jetson-tk1.dts
>> [4] make CROSS_COMPILE=arm-linux-gnueabihf-
> 
> Hmm, OK. Understood.
> 
> The jetson DT was recompiled,
> but the other tegra DT files were not.

Yes, perhaps I should have mentioned that I found this issue when 
building sandbox. Sandbox's default DTB of sandbox.dtb does get 
recompiled as expected, but test.dtb (used by the test/py/ test system) 
does not, for incremental builds.