[Bug 253494] the uart driver does not recognize HSUARTs on a FitPC Fitlet2 computer

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253494

            Bug ID: 253494
           Summary: the uart driver does not recognize HSUARTs on a FitPC
                    Fitlet2 computer
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: bsd at bobdbob.com

Overview:

A Fitlet2 computer has an onboard serial port which is a PCI attached HSUART. 
The uart driver does not recognize the port, no /dev/cua* is created.  

To Reproduce:

Attempt to use a serial port on a fitlet2 computer, or perhaps more generally,
a Celeron N3350/Pentium N4200/Atom E3900.  Note that there is no /dev/cua* for
the serial port.

The hardware appears in pciconf as:

none2 at pci0:0:24:2:      class=0x118000 card=0x72708086 chip=0x5ac08086 rev=0x0b
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Celeron N3350/Pentium N4200/Atom E3900 Series HSUART
Controller'
    class      = dasp

I cargo-culted the fix in PR 207910, and added the PCI id to the list in
src/sys/dev/uart/uart_bus_pci.c.

Adding the following at line 168:

{ 0x8086, 0x5abc, 0xffff, 0, "Celeron N3350/Pentium N4200/Atom E3900 Series
HSUART#0", 0x10,
        24 * DEFAULT_RCLK, 2 },
{ 0x8086, 0x5abe, 0xffff, 0, "Celeron N3350/Pentium N4200/Atom E3900 Series
HSUART#1", 0x10,
        24 * DEFAULT_RCLK, 2 },
{ 0x8086, 0x5ac0, 0xffff, 0, "Celeron N3350/Pentium N4200/Atom E3900 Series
HSUART#2", 0x10,
        24 * DEFAULT_RCLK, 2 },
{ 0x8086, 0x5aee, 0xffff, 0, "Celeron N3350/Pentium N4200/Atom E3900 Series
HSUART#3", 0x10,
        24 * DEFAULT_RCLK, 2 },

I can only verify that HSUART#2 works correctly, since the Fitlet hardware has
only a single exposed RS-232 port (tested by connecting TX to RX, and observing
the echo using kermit.).  There is a second physical port on an internal
connector which is more difficult to get to.

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