imx8mn SPL serial output does not work after powerup

[Heiko Thiery]

Hi Peng,

Am Di., 14. Juni 2022 um 03:46 Uhr schrieb Peng Fan (OSS)
<peng.fan at oss.nxp.com>:
>
>
>
> 在 2022/6/14 3:49, Heiko Thiery 写道:
> > Am Mo., 13. Juni 2022 um 21:43 Uhr schrieb Heiko Thiery
> > <heiko.thiery at gmail.com>:
> >> Hi,
> >>
> >> Am Mo., 13. Juni 2022 um 21:28 Uhr schrieb Fabio Estevam <festevam at gmail.com>:
> >>> Hi Heiko,
> >>>
> >>> On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery at gmail.com> wrote:
> >>>
> >>>> Can anyone confirm the behavior?
> >>> imx8mn ddr4 evk prints the SPL part just fine.
> >>>
> >>> Take a look at arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi .
> >>>
> >>> It passes:
> >>>
> >>> &uart2 {
> >>>        u-boot,dm-spl;
> >>> };
> >>>
> >>> &pinctrl_uart2 {
> >>>       u-boot,dm-spl;
> >>> };
> >>>
> >>> Are you doing the same for the imx8mn ddr3 u-boot dtsi?
> >> Indeed these are missing. Now I see the whole output from U-Boot but
> >> the output from SPL is still missing. When enabloing SPL_DM_SERIAL the
> >> board does not start.
> >
> > I now did include the whole "imx8mn-ddr4-evk-u-boot.dtsi" like it is
> > done in "imx8mn-evk-u-boot.dtsi". Then it works.
>
> make sure preload_console_init is called after spl_early_init or
> spl_init, not before.

The board init code is used from imx8mn_evk [1]. So the init sequence
seems to be correct.

[1] https://source.denx.de/u-boot/u-boot/-/blob/master/board/freescale/imx8mn_evk/spl.c#L137

--
Heiko