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

[Marek Vasut]

On 5/25/20 6:59 PM, Simon Glass wrote:
> 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.

Y-RCAR-E2-SILK-A is probably the one you want then. I got it from Mouser
iirc.