Unable to reboot on Olimex ARM lime2

[stepfr]

Hello,
Using Lime2 revG2 hardware, i tested nearly all reboot commands (reboot, poweroff --reboot, systemctl start reboot.target...). I also tried to change RebootWatchdogSec to 8s to use watchdog to help rebooting. But no luck, the system just hang (red led is on near power, but everything else is switch off).

Any way to reboot this arm device (when away) ? I can not remove the power cord remotely !
It seems linked to archlinux arm because using armbian, i can reboot.
Thanks

Step

[stepfr]

just a bit more information from Lime2 builder:
"Most problem are due to driver handling power management unit, in this case AXP209"
Comparing to rebooting device (using armbian): i have :
axp20x_battery 16384 0
axp20x_adc 16384 0

in common.

industrialio 57344 3 axp20x_battery,sun4i_gpadc_iio,axp20x_adc
pinctrl_axp209 16384 0
are added in the armbian

in the archlinux i have this PM modules :
axp20x_adc 16384 0
axp20x_battery 16384 0
axp20x_pek 16384 0
axp20x_ac_power 16384 0

may be a start to solve the problem.