[U-Boot] Makefile: Update minimum dtc version to 1.4.3

[Tom Rini]

On Sun, Sep 24, 2017 at 08:41:32AM +0200, Heinrich Schuchardt wrote:
> On 09/23/2017 07:53 PM, Tom Rini wrote:
> > On Sat, Sep 23, 2017 at 07:43:09PM +0200, Marek Vasut wrote:
> >> On 09/23/2017 07:37 PM, Tom Rini wrote:
> >>> On Sat, Sep 23, 2017 at 07:33:44PM +0200, Marek Vasut wrote:
> >>>> On 09/23/2017 07:05 PM, Tom Rini wrote:
> >>>>> On Sat, Sep 23, 2017 at 08:56:08AM -0400, Tom Rini wrote:
> >>>>>> On Sat, Sep 23, 2017 at 12:39:44PM +0200, Marek Vasut wrote:
> >>>>>>> On 09/22/2017 04:20 PM, Tom Rini wrote:
> >>>>>>>> On Fri, Sep 15, 2017 at 01:15:25PM -0400, Tom Rini wrote:
> >>>>>>>>
> >>>>>>>>> With support for overlays and calling the -@ flag to dtc we need to have
> >>>>>>>>> at least 1.4.3 available now.
> >>>>>>>>>
> >>>>>>>>> Cc: Simon Glass <sjg at chromium.org>
> >>>>>>>>> Reported-by: Stephen Warren <swarren at wwwdotorg.org>
> >>>>>>>>> Signed-off-by: Tom Rini <trini at konsulko.com>
> >>>>>>>>
> >>>>>>>> Applied to u-boot/master, thanks!
> >>>>>>>
> >>>>>>> Debian still only has 1.4.2 even in unstable, so u-boot/master no longer
> >>>>>>> builds on any debian system.
> >>>>>>
> >>>>>> Then perhaps we need to mirror the kernel and provide / build dtc, but
> >>>>>> allow for people to override it.
> >>>>>
> >>>>> This isn't too hard and I'm pushing that through Jenkins now to confirm
> >>>>> I've got all the logic correct.  I think this will be the least error
> >>>>> prone method long term.
> >>>>
> >>>> NAK, this is the same thing which chromium does and what Debian is
> >>>> trying to stop -- vendoring. We will end up with patched custom DTC out
> >>>> of sync with upstream.
> >>>
> >>> Shrug, it's what Linux does, and what QEMU does, and probably what other
> >>> projects do as well since apparently even Debian/Unstable is 2 releases
> >>> and nearly a year behind (or, 9 months if you don't want to exaggerate).
> >>
> >> And it will likely stay that way for debian stable. I am really
> >> disappointed in the "Shrug" reaction to such massive breakage.
> > 
> > Nope and nor will it catch old-stable breaking in January when gcc-6.x
> > or newer is required.
> > 
> 
> Above you have been discussing code duplication. This is not the right
> way to work with git.
> 
> The git way is to add
> https://git.kernel.org/pub/scm/utils/dtc/dtc.git
> as git submodule (https://git-scm.com/docs/git-submodule).
> 
> In our make file we can then use git submodule init, git submodule
> update, git verify-tag before we build a dtc with the appropriate version.
> 
> This way we can build dtc from sources but stay in sync with the upstream.

I'm not wading into the submodules vs repo debate.  Happily the Linux
Kernel already came up with a small script to just sync in what we need
of the tool sources and to keep said sources in sync.  The only
divergence there between strict upstream is cherry-picking (essentially)
of a few changes, rather than just doing a re-sync of the tool).

-- 
Tom
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