[Bug 194952] New: uart(4) needs BayTrail support for Minnowboard Max

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194952

            Bug ID: 194952
           Summary: uart(4) needs BayTrail support for Minnowboard Max
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

See PR 192324

Intel's BayTrail SoC has 16550-like UARTs with some extra functionality. They
appear to require some special configuration as well; presumably the firmware
performs this configuration and enables a compatibility mode for CSM booting.
Just adding the PCI device IDs is not sufficient.

none7 at pci0:0:30:3:      class=0x078000 card=0x72708086 chip=0x0f0a8086 rev=0x0c
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'ValleyView LPIO1 HSUART Controller'
    class      = simple comms
    cap 01[80] = powerspec 3  supports D0 D3  current D0
none8 at pci0:0:30:4:      class=0x078000 card=0x72708086 chip=0x0f0c8086 rev=0x0c
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'ValleyView LPIO1 HSUART Controller'
    class      = simple comms
    cap 01[80] = powerspec 3  supports D0 D3  current D0

Related Linux commits are b15e5691 and 29897087

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