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

[Marek Vasut]

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.