I have a reboot issue on imx8m Mini

[jack-6602]

Dear NXP Support Team:

I'm working on imx8m mini board, the uboot version is 2023.01, kernel version is 6.6.58. Debian12

1: Plug USB keyboard into USB host of main board.

2: power on and press the shortcut key Ctrl+Alt+Del at the same time. （Keep pressing the release shortcut key, not holding it down and not letting go）

Expect results：

System booting normal even if press the shortcut key Ctrl+Alt+Del

Actual results：

System will be rebooted during press the shortcut key.

Actually, I have alreadly configured in system.

1: CtrlAltDelBurstAction=none

2: HandleRebootKey=ignore

3: HandlePowerKey=ignore

4: HandleSuspendKey=ignore

The following is log:

U-Boot SPL 2023.01+dfsg-2+exp2-00021-gc17db9adfe-dirty (Feb 13 2025 - 06:40:59 +0000)
WDT: Started watchdog@30280000 with servicing every 1000ms (60s timeout)
NOTICE: Do not release JR0 to NS as it can be used by HAB
NOTICE: BL31: v2.8(debug):c433a63
NOTICE: BL31: Built : 16:00:56, Jan 30 2024
INFO: GICv3 with legacy support detected.
INFO: ARM GICv3 driver initialized in EL3
INFO: Maximum SPI INTID supported: 159
INFO: BL31: Initializing runtime services
INFO: BL31: cortex_a53: CPU workaround for 855873 was applied
WARNING: BL31: cortex_a53: CPU workaround for 1530924 was missing!
INFO: BL31: Preparing for EL3 exit to normal world
INFO: Entry point address = 0x40200000
INFO: SPSR = 0x3c9

U-Boot 2023.01+dfsg-2+exp2-00021-gc17db9adfe-dirty (Feb 13 2025 - 06:40:59 +0000)

CPU: Freescale i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz)
CPU: Industrial temperature grade (-40C to 105C) at 51C
Reset cause: POR
DRAM: 2 GiB
Core: 233 devices, 26 uclasses, devicetree: separate
WDT: Started watchdog@30280000 with servicing every 1000ms (60s timeout)
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... OK
[ 0.000000] KASLR disabled due to lack of seed
[ 0.000000] ITS: No ITS available, not enabling LPIs
[ 1.179756] samsung-dsim 32e10000.dsi: supply vddcore not found, using dummy regulator
[ 1.187889] samsung-dsim 32e10000.dsi: supply vddio not found, using dummy regulator
[ 1.219728] spi-nor spi3.0: unrecognized JEDEC id bytes: 00 00 00 00 00 00
[ 1.290995] failed to register cpuidle driver

[ 1.692248] ### ds90ub941_atomic_enable
Loading, please wait...
Starting systemd-udevd version 252.33-1~deb12u1
Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... done.
Warning: fsck not present, so skipping root file system
done.
Begin: Running /scripts/local-bottom ... done.
Begin: Running /scripts/init-bottom ... [ 3.831971] ### ds90ub941_atomic_disable
[ 3.876033] imx2-wdt 30280000.watchdog: Device shutdown.
[ 3.881567] reboot: Restarting system

Could you give some idea or how to debug to check which part trigger the watch dog?

[jack-6602]

CtrlAltDelBurstAction=none This configuration can solve the problem that pressing the shortcut key Ctrl+Alt+Del will not restart the system after the system starts, which is valid.

However, if the shortcut key Ctrl+Alt+Del is pressed during kernel startup, the system will restart, and this configuration will be invalid.