@Dorian,
Can you please share the acpidump for IB8000 Atom Braswell board?
Also, please check if Debian 4.16.0-2 has CONFIG_SERIAL_DEV_BUS=y enabled by default. If not, then ttySx ports on this kernel will not be claimed by the Serdev bus sub-system.
@Dorian,
Can you please share the acpidump for IB8000 Atom Braswell board?
Also, please check if Debian 4.16.0-2 has CONFIG_ SERIAL_ DEV_BUS= y enabled by default. If not, then ttySx ports on this kernel will not be claimed by the Serdev bus sub-system.