Public bug reported:
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.
Please don't triage, this bug is for tracking purposes only.
** Affects: linux-oem (Ubuntu)
Importance: Critical
Status: Confirmed
** Description changed:
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.
Please don't triage, this bug is for tracking purposes only.
** Changed in: linux-oem (Ubuntu)
Status: New => Confirmed
** Changed in: linux-oem (Ubuntu)
Importance: Undecided => Critical
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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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