[RFC PATCH 3/3] serial: mxc: restore booting for imx8mn_bsh_smm_s2

[Fabio Estevam]

On Sat, May 17, 2025 at 5:15 PM Michael Nazzareno Trimarchi
<michael at amarulasolutions.com> wrote:

> Can you please point me to an example of a tested board?

I have just tested the top-of-tree U-Boot on an imx8mn evk board:

U-Boot SPL 2025.07-rc2-00018-g126a88d49bca (May 17 2025 - 17:21:14 -0300)
WDT:   Started watchdog at 30280000 with servicing every 1000ms (60s timeout)
SEC0:  RNG instantiated
Normal Boot
Trying to boot from BOOTROM
Boot Stage: Primary boot
image offset 0x8000, pagesize 0x200, ivt offset 0x0
NOTICE:  Do not release JR0 to NS as it can be used by HAB
NOTICE:  BL31: v2.12.0(release):v2.12.0
NOTICE:  BL31: Built : 17:16:49, May 17 2025


U-Boot 2025.07-rc2-00018-g126a88d49bca (May 17 2025 - 17:21:14 -0300)

CPU:   NXP i.MX8MNano Quad Rev1.0 A53 at 1200 MHz
CPU:   Consumer temperature grade (0C to 95C) at 32C
Model: NXP i.MX8MNano DDR4 EVK board
DRAM:  2 GiB
Core:  180 devices, 23 uclasses, devicetree: separate
WDT:   Started watchdog at 30280000 with servicing every 1000ms (60s timeout)
MMC:   FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... Reading from MMC(1)... OK
In:    serial at 30890000
Out:   serial at 30890000
Err:   serial at 30890000
SEC0:  RNG instantiated
Net:   eth0: ethernet at 30be0000
Hit any key to stop autoboot:  0
u-boot=>

Make sure you are using the most recent U-Boot. We had some imx8m
clock drive hickups after 2025.04.