[U-Boot] [PATCH 00/93] dm: Move towards completing CONFIG_BLK migration

[Tom Rini]

On Mon, Nov 19, 2018 at 10:32:01PM +0100, Marek Vasut wrote:
> On 11/19/2018 08:45 PM, Adam Ford wrote:
> > On Mon, Nov 19, 2018 at 12:36 PM Tom Rini <trini at konsulko.com> wrote:
> >>
> >> On Mon, Nov 19, 2018 at 10:54 AM Simon Glass <sjg at chromium.org> wrote:
> >>>
> >>> All boards should now be migrated to use CONFIG_BLK. This series removes
> >>> those with build problems using this option.
> >>>
> >>> If maintainers want to keep these boards in they should send a patch in
> >>> the next week or two. Otherwise the board will be removed in the next
> >>> release, and will need to be added and re-reviewed later.
> >>>
> >>> The goal is to have all boards use driver model. But so far, we do allow
> >>> CONFIG_DM to not be defined.
> >>>
> >>> PLEASE NOTE: This is not an easy process. It is possible that your board
> >>> does work, or works with only minor changes. Please try to understand that
> >>> the removal of a board is not done because people don't like your board.
> >>> In fact the board might have been the first one I used when trying out
> >>> U-Boot! It's just that we expect maintainers to keep up with the migration
> >>> to driver model which has been running now for 4 years. It just isn't
> >>> possible for a few people to migrate and test hundreds of boards.
> >>>
> >>> So, send a patch!
> >>
> >> OK, so with the intention of "need to light a fire", consider the fire
> >> lit!  But, I think v2 of this series needs to:
> >> - Address the bug that's been noted of you checking on "DM_BLK" when
> >>   it's really just "BLK".
> >> - Do a test build with BLK just being unconditional now.  For example,
> >>   you're deleting the am335x_evm family but it builds fine with BLK
> >>   being enabled now.  I even gave it a run time test via test.py and
> >>   we're fine.  So, I think a new run where you see what fails to build
> >>   with BLK enabled by default now is in order to come up with a new
> >>   delete list.
> >>
> > 
> > When we were migrating toward GCC 6, we introduced a warning message
> > that was displayed at build indicating older versions of GCC would be
> > unsupported, and GCC 6 would become a requirement.  The
> > CONFIG_DM_I2C_COMPAT generates a build warning and suggests that it be
> > removed.  I would like to propose that in the future, when setting
> > deadlines, we insert something into the build mechanism that generates
> > a warning to tell people that something is going to happen.
> 
> I agree, that sounds good.
> 
> I am extremely unhappy by how Simon decided, unilaterally, some
> arbitrary deadline, told pretty much no one about that deadline and then
> put a knife on many peoples' throats by sending out this series which
> removes boards that are actively used and maintained, demanding they be
> converted right this instant.

OK, lets step back for a moment.  Part of the problem is that yes, we
(I) never found a good way to make a big scary build warning happen.
But, lets look at https://patchwork.ozlabs.org/patch/798309/ for a
moment, which is when we set this deadline, and we had a good bit of
discussion about related issues to make it happen.

I also know that around the v2018.05 release I said, in public, but no I
can't find a link right this moment, that we were pushing off a little
bit on dropping _everything_ right then as there was basically some
fairly important / widely used USB stuff that hadn't been converted yet
(which has since been, I think, otherwise am335x_evm & co wouldn't have
been happy?).  I know I did since I can see in the archives a number of
series where maintainers did a bunch of changes to various platforms /
SoCs to turn on BLK right then.

So, no, I don't want to drop a bunch of platforms _right_now_.  But we
really need to see what doesn't link anymore with BLK forced on, and
plan from there.

-- 
Tom
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