usb issues on OLD USB 1.0 machine...

So, I'm trying to get USB functional on an old i386 machine that only
supports USB 1.0...  It works, but when I try to plug in a hub I get
the following:
uhub0: 2 ports with 2 removable, self powered
Root mount waiting for: usbus0
usb_alloc_device: set address 2 failed (USB_ERR_IOERROR, ignored)
Root mount waiting for: usbus0
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
Root mount waiting for: usbus0
usbd_req_re_enumerate: addr=2, set address failed! (USB_ERR_IOERROR, ignored)
Root mount waiting for: usbus0
Root mount waiting for: usbus0
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
Root mount waiting for: usbus0
usbd_req_re_enumerate: addr=2, set address failed! (USB_ERR_IOERROR, ignored)
Root mount waiting for: usbus0
Root mount waiting for: usbus0
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
usbd_req_re_enumerate: addr=2, set address failed! (USB_ERR_IOERROR, ignored)
Root mount waiting for: usbus0
Root mount waiting for: usbus0
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
Root mount waiting for: usbus0
usbd_req_re_enumerate: addr=2, set address failed! (USB_ERR_IOERROR, ignored)
Root mount waiting for: usbus0
Root mount waiting for: usbus0
usbd_setup_device_desc: getting device descriptor at addr 2 failed, USB_ERR_IOERROR
ugen0.2: <Unknown> at usbus0 (disconnected)
uhub_reattach_port: could not allocate new device

This was working w/ code from around a month ago, but I don't remeber
which rev it was, and I forgot to save the old kernel..  This is from:
FreeBSD serbox.funkthat.com 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r266964:267061M: Wed Jun 11 15:35:27 PDT 2014     jmg_at_carbon.funkthat.com:/usr/obj/i386.i386/usr/src/sys/serbox  i386

Interesting parts of dmesg:
FreeBSD 11.0-CURRENT #0 r266964:267061M: Wed Jun 11 15:35:27 PDT 2014
    jmg_at_carbon.funkthat.com:/usr/obj/i386.i386/usr/src/sys/serbox i386
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
CPU: AMD-K6tm w/ multimedia extensions (200.46-MHz 586-class CPU)
  Origin="AuthenticAMD"  Id=0x562  Family=0x5  Model=0x6  Stepping=2
  Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
  AMD Features=0x400<<b10>>
real memory  = 134217728 (128 MB)
avail memory = 120770560 (115 MB)
[...]
uhci0: <VIA 83C572 USB controller> port 0x6400-0x641f irq 10 at device 7.2 on pci0
usbus0 on uhci0
[...]
usbus0: 12Mbps Full Speed USB v1.0
ugen0.1: <VIA> at usbus0
uhub0: <VIA UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0

usbconfig:
ugen0.1: <UHCI root HUB VIA> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=SAVE (0mA)
ugen0.2: <USB-Serial Controller Prolific Technology Inc.> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (100mA)

The ugen0.2 is plugged directly into the one of the ports, and works..

Let me know if there is anything more info I can provide.

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."