** Also affects: linux-oem (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1769610
Title:
Support Intel Atom (Baytrail-I) HS-UART serdev slaves over tty
Status in linux-oem package in Ubuntu:
Confirmed
Status in linux-oem source package in Bionic:
New
Bug description:
Support Intel Atom (Baytrail-I) HS-UART serdev slaves over tty
On systems using Intel Atom (Baytrail-I) SoC's, slave devices connected on
HSUART1/2 ports are described by the ACPI BIOS as virtual hardware using
HID's INT3511/INT3512 [1].
As a consequence, HW manufacturers have complete freedom to install any
devices on-board as long as they can be accessed over serial tty
interface. Once such device is Dell Edge 3002 IoT Gateway which sports
ZigBee & GPS devices on the HS-UART ports 1 & 2 respectively.
Post 4.15, with CONFIG_SERIAL_DEV_BUS=y, serdev port controller driver
handles the enumeration for the slaves connected on these ports. Also,
/dev/ttySx device nodes for these ports are no longer exposed to the
userspace.
This driver has been submitted upstream and is under review. This issue has
been identified as a regression in 4.15 and multiple solutions are being
explored. Meanwhile, to support customer and maintain release schedule,
this driver needs to be in Ubuntu 4.15 based kernels.
The impact is limited to systems based on Intel Atom E38XX (Baytrail-I)
SoC's.
More info:
https://marc.info/?t=152455871600007&r=1&w=2
Please don't triage, this bug is for tracking purposes only.
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