@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.

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https://bugs.launchpad.net/bugs/1769610

Title:
  Support Intel Atom (Baytrail-I) HS-UART serdev slaves over tty

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