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

[Peng Fan]

Hi Marek,

> 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+

Regards,
Peng.