[U-Boot] is it mandatory for SPL to support DM

[Simon Glass]

Hi Marek,

On Mon, 25 May 2020 at 09:56, Marek Vasut <marex at denx.de> wrote:
>
> On 5/25/20 5:48 PM, Simon Glass wrote:
> > Hi Marek,
> >
> > On Mon, 25 May 2020 at 09:43, Marek Vasut <marex at denx.de> wrote:
> >>
> >> On 5/25/20 5:36 PM, Simon Glass wrote:
> >>> Hi,
> >>>
> >>> On Mon, 25 May 2020 at 04:35, Marek Vasut <marex at denx.de> wrote:
> >>>>
> >>>> On 5/25/20 10:44 AM, Jagan Teki wrote:
> >>>>> SPL has a foot-print constraint, so fully switching a particular
> >>>>> subsystem like SPI or SPI Flash to DM would increase the size of it.
> >>>>>
> >>>>> Possible areas to look at are (assume SPL_DM supported)
> >>>>> 1) platdata
> >>>>> 2) implement board or platform specific spl device driver which
> >>>>> bypassed the actual framework ex: spl_spi_sunxi.c
> >>>>>
> >>>>> Do we have any other solutions? or any arguments on above step 2?
> >>>>
> >>>> SPL does not need to support DM until the size problem is solved.
> >>>
> >>> I don't think the problem will ever be 'solved'. It is an ongoing battle.
> >>>
> >>> But as it happens I've just sent a proposal for tiny-dm that I think will help.
> >>>
> >>> Jagan, which board are you trying to convert? If you are trying to
> >>> convert SPI flash, I think we need to remove the legacy code first.
> >>
> >> If you want a board which boots from SPI NOR and has some 14k or so
> >> limit on SPL, any of the R-Car Gen2 boards fit the bill.
> >
> > Thanks...do you have a link to one?
>
> https://elinux.org/R-Car/Boards/U-Boot-Gen2

I mean a link to buy one...if not too expensive. The links on those
pages all go nowhere. Digikey lists it as a 'non-stock' item.

>
> > Also was there a 64-bit board that had to run 64-bit SPL? I think I
> > remember you mentioning it.
>
> You can build SPL for R-Car Gen3 boards.

Regards,
Simon