imx8mn SPL serial output does not work after powerup

imx8mn SPL serial output does not work after powerup

[Heiko Thiery]

Hi,

After a powerup the SPL output is not seen.

[Powerup]
Core:  140 devices, 19 uclasses, devicetree: separate
WDT:   Started watchdog@30280000 with servicing (60s timeout)
MMC:   FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... *** Warning - bad CRC, using default environment

In:    serial@30890000
Out:   serial@30890000
Err:   serial@30890000
Net:   eth0: ethernet@30be0000
Hit any key to stop autoboot:  0
u-boot=>

Only after a softreset the output from SPL can be seen.

u-boot=> reset
resetting ...

U-Boot SPL 2022.07-rc4-00012-g4b48844ba4 (Jun 13 2022 - 21:06:16 +0200)
Normal Boot
Failed to find clock node. Check device tree
Trying to boot from BOOTROM
image offset 0x8000, pagesize 0x200, ivt offset 0x0
NOTICE:  BL31: v2.6(release):v2.6-5-g9b1a4d832
NOTICE:  BL31: Built : 14:03:53, May 10 2022


U-Boot 2022.07-rc4-00012-g4b48844ba4 (Jun 13 2022 - 21:06:16 +0200)

CPU:   Freescale i.MX8MNano UltraLite Quad rev1.0 at 1200 MHz
Reset cause: WDOG
Model: NXP i.MX8MNano DDR3L EVK board
DRAM:  1 GiB
Core:  140 devices, 19 uclasses, devicetree: separate
WDT:   Started watchdog@30280000 with servicing (60s timeout)
MMC:   FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... *** Warning - bad CRC, using default environment

In:    serial@30890000
Out:   serial@30890000
Err:   serial@30890000
Net:   eth0: ethernet@30be0000
Hit any key to stop autoboot:  0
u-boot=>


Can anyone confirm the behavior?

--
Heiko

Re: imx8mn SPL serial output does not work after powerup

[Fabio Estevam]

Hi Heiko,

On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery@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?

Re: imx8mn SPL serial output does not work after powerup

[Heiko Thiery]

Hi,

Am Mo., 13. Juni 2022 um 21:28 Uhr schrieb Fabio Estevam <festevam@gmail.com>:
>
> Hi Heiko,
>
> On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery@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.

-- 
Heiko

Re: imx8mn SPL serial output does not work after powerup

[Michael Nazzareno Trimarchi]

Hi

Il lun 13 giu 2022, 21:43 Heiko Thiery <heiko.thiery@gmail.com> ha scritto:

> Hi,
>
> Am Mo., 13. Juni 2022 um 21:28 Uhr schrieb Fabio Estevam <
> festevam@gmail.com>:
> >
> > Hi Heiko,
> >
> > On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery@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.
>

Check if you have UART clock enabled in sol

Michael

>
> --
> Heiko
>

Re: imx8mn SPL serial output does not work after powerup

[Heiko Thiery]

Am Mo., 13. Juni 2022 um 21:43 Uhr schrieb Heiko Thiery
<heiko.thiery@gmail.com>:
>
> Hi,
>
> Am Mo., 13. Juni 2022 um 21:28 Uhr schrieb Fabio Estevam <festevam@gmail.com>:
> >
> > Hi Heiko,
> >
> > On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery@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.

> --
> Heiko

Re: imx8mn SPL serial output does not work after powerup

[Peng Fan (OSS)]

在 2022/6/14 3:49, Heiko Thiery 写道:
> Am Mo., 13. Juni 2022 um 21:43 Uhr schrieb Heiko Thiery
> <heiko.thiery@gmail.com>:
>> Hi,
>>
>> Am Mo., 13. Juni 2022 um 21:28 Uhr schrieb Fabio Estevam <festevam@gmail.com>:
>>> Hi Heiko,
>>>
>>> On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery@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.

Regards,
Peng.

>
>> --
>> Heiko

Re: 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@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@gmail.com>:
> >> Hi,
> >>
> >> Am Mo., 13. Juni 2022 um 21:28 Uhr schrieb Fabio Estevam <festevam@gmail.com>:
> >>> Hi Heiko,
> >>>
> >>> On Mon, Jun 13, 2022 at 4:16 PM Heiko Thiery <heiko.thiery@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