Requiring SPL_DM for new boards?

[Simon Glass]

Hi Tom,

On Fri, 21 Oct 2022 at 10:26, Tom Rini <trini at konsulko.com> wrote:
>
> On Fri, Oct 14, 2022 at 09:56:44AM -0600, Simon Glass wrote:
>
> > Hi,
> >
> > What do people think about requiring SPL_DM for new boards? Would that
> > cause any problems?
> >
> > There is not much use of of-platdata (compiling the DT into C to save
> > space) - is that because it doesn't work for people?
> >
> > I am particularly keen to drop the old block interface from SPL. It
> > seems to me that boards that can use that might have enough space to
> > enable SPL_DM and SPL_DM_BLK? What do people think?
>
> I don't think this works. The problem is we aren't seeing new SoCs that
> have a large initial amount of memory but rather many continuing to have
> 32KiB or similar tiny sizes. So, I'd rather continue to go with saying
> it's optional, but that we won't introduce new SPL functionality that
> can be DM or not DM, but only new functionality that needs SPL_DM and
> if platforms want it, but have limited memory, we need to go TPL->SPL in
> that case.

OK I see.

What do you think of a migration method for boards which don't use
SPL_DM, so they migrate to TPL? Would that cause a lot of problems?

Regards,
Simon