>What do I need to put in the config file to get this card working with the HW
>flow control and larger FIFO?

options		COM_HAYESP

Then just make sure you have a standard com port config line for it.
For example:

com2	at isa? port 0x3e8 irq 5

One important note: the ESP can be used at more IRQs than a "standard
com port".  Specifically, it can use the "upper" IRQ lines, in the
8-15 range, as well as the traditional ones.  You'll probably want to
re-run that software config program to make sure you have everything
set right.  The "com port" that you set it for determines its I/O
address range.  The IRQ is set separately.

If you need more help, let me know.

-----------------------------------------------------------------------------
  Michael L. VanLoon                                 michaelv@HeadCandy.com
        --<  Free your mind and your machine -- NetBSD free un*x  >--
    NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
        Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
    NetBSD ports in progress: PICA, others...

   Roll your own Internet access -- Seattle People's Internet cooperative.
                  If you're in the Seattle area, ask me how.
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