[RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset driver for SPL

[Marek Vasut]

On 1/17/20 3:33 AM, Peng Fan wrote:
> Hi Marek,

Hi,

>> Subject: Re: [RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset
>> driver for SPL
>>
>> On 1/16/20 3:21 AM, Peng Fan wrote:
>>
>> Hello Peng,
>>
>>>> Subject: [RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset
>>>> driver for SPL
>>>>
>>>
>>> NAK, this will not work on i.MX8MM/N.
>>>
>>> Currently sysreset psci is enabled, however psci will not work for
>>> SPL, because SPL boots before BL31.
>>
>> Thank you for the constructive feedback.
>>
>> So basically , what we need is a real sysreset driver for iMX8MM , which can
>> work with bare-bones hardware interface, that is, poking some register,
>> correct ?
> 
> Yes.
> 
>>
>> So, either you or Claudius needs to implement a driver in drivers/sysreset,
>> which will bind in SPL and if needed, do some writel() into some registers to
>> reset the board, correct ?
> 
> Yes.
> 
>>
>> Because, I believe we can both agree that dumping such ad-hoc code which
>> implements reset in board code is not the right way, esp. nowadays with all
>> the DM/DT stuff in.
> 
> Alought we still have ocram space, but our SPL is huge now, 100KB+

How so ?

How much does DM sysreset add to that ?