imx8m(n): garbage on serial line

[Fabio Estevam]

Hi Heiko,

On Fri, Jun 10, 2022 at 7:29 AM Heiko Thiery <heiko.thiery at gmail.com> wrote:
>
> Hi,
>
> I just rebased my pending patch for adding support for the NXP imx8mn
> ddr3l evk board. When applying on the current master I see some
> garbage on the serial input.
>
> Can anyone confirm that behavior or is it just here?
>
> U-Boot 2022.07-rc4-00011-gacd4e97ae6 (Jun 10 2022 - 09:46:24 +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, 18 uclasses, devicetree: separate
> WDT:   Started watchdog at 30280000 with servicing (60s timeout)
> MMC:   FSL_SDHC: 1, FSL_SDHC: 2
> Loading Environment from MMC... OK
> In:    serial
> Out:   serial
> Err:   serial
> Net:   eth0: ethernet at 30be0000
> Hit any key to stop autoboot:  0
> u-boot=> [25;88R
> Unknown command '[25' - try 'help'
> Unknown command '88R' - try 'help'
> u-boot=>
> Unknown command '[25' - try 'help'
> Unknown command '88R' - try 'help'
> u-boot=>

Yes,  I see the same on the Kontron i.MX8MM N801X S board:

U-Boot 2022.07-rc3 (Jun 07 2022 - 22:29:02 +0000)

CPU:   Freescale i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 50C
Reset cause: POR
Model: Kontron i.MX8MM N801X S
DRAM:  4 GiB
Core:  177 devices, 27 uclasses, devicetree: separate
WDT:   Not starting watchdog at 30280000
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
SEC0:  RNG instantiated
Net:   Could not get PHY for FEC0: addr 0
No ethernet found.

Hit any key to stop autoboot:  0
=> [55;203R
Unknown command '[55' - try 'help'
Unknown command '203R' - try 'help'

I haven't had a chance to debug/bisect it yet.

Regards,

Fabio Estevam