imx8m(n): garbage on serial line

[Fabio Estevam]

Hi Heiko,

On Mon, Jun 13, 2022 at 10:54 AM Heiko Thiery <heiko.thiery at gmail.com> wrote:

> This is the output on the kontron bl-imx8m board:
>
> U-Boot SPL 2022.07-rc4-00007-g8c3f838be2 (Jun 13 2022 - 15:36:08 +0200)
> Kontron SL i.MX8MM (N801X) module, 1 GB RAM detected
> Touch controller detected, assuming LVDS panel...
> Normal Boot
> WDT:   Not starting watchdog at 30280000
> Trying to boot from MMC2
> NOTICE:  BL31: v2.4(release):v2.4

Just tried with the same v2.4 TF-A version:

U-Boot SPL 2022.07-rc4-00007-g57bd363de7 (Jun 13 2022 - 11:18:10 -0300)
Kontron SL i.MX8MM (N801X) module, 4 GB RAM detected
Normal Boot
WDT:   Not starting watchdog at 30280000
Trying to boot from MMC1
NOTICE:  BL31: v2.4(release):v2.4
NOTICE:  BL31: Built : 11:17:34, Jun 13 2022


U-Boot 2022.07-rc4-00007-g57bd363de7 (Jun 13 2022 - 11:18:10 -0300)

CPU:   Freescale i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 60C
Reset cause: POR
Model: Kontron i.MX8MM N801X S
DRAM:  4 GiB
Core:  175 devices, 25 uclasses, devicetree: separate
WDT:   Not starting watchdog at 30280000
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from SPIFlash... SF: Detected mx25r1635f with page
size 256 Bytes, erase size 64 KiB, total 2 MiB
OK
In:    serial
Out:   serial
Err:   serial
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'

and the serial garbage is seen.

My version has 4GiB of RAM, yours has only 1GiB.

Could this make a difference?

Thanks