I'm using a NovPek i.mx6x board and trying to get ethernet working with a Plugable USB2-E1000 USB to Ethernet adapter.  
The behavior is really strange.  I've tried this with the stock devn-asix driver for armle-v7 as well as the driver from
 this thread (http://community.qnx.com/sf/go/topc22380).  I've also tried using a powered hub as mentioned in another 
thread.

Here are the results of various investigation attempts:
** USB finds device **
# usb -v
USB 0 (EHCI) v1.10, v1.01 DDK, v1.01 HCD
    Control, Interrupt, Bulk(SG), Isoch(Stream), Low speed, High speed

USB 1 (EHCI) v1.10, v1.01 DDK, v1.01 HCD
    Control, Interrupt, Bulk(SG), Isoch(Stream), Low speed, High speed

Device Address             : 1
Upstream Host Controller   : 1
Upstream Device Address    : 0
Upstream Port              : 0
Upstream Port Speed        : High
Vendor                     : 0x0409 (NEC)
Product                    : 0x005a
Device Release             : r1.00
Class                      : 0x09 (Hub)
Subclass                   : 0x00
Protocol                   : 0x01
Max PacketSize0            : 64
Hub Number Ports           : 4
Hub Characteristics        : 0x00a9 (Individual power, Individual over-current)
Hub Power On->Good         : 100 ms
Hub Power Requirements     : 100 mA
Configurations             : 1
  Configuration            : 1
    Attributes             : 0xe0 (Self-powered, Remote-wakeup)
    Max Power              : 100 mA

Device Address             : 2
Upstream Host Controller   : 1
Upstream Device Address    : 1
Upstream Port              : 4
Upstream Port Speed        : High
Vendor                     : 0x0b95 (ASIX Elec. Corp.)
Product                    : 0x1780 (AX88178 )
Device Release             : r0.01
Class                      : 0xff (Vendor-specific)
Subclass                   : 0xff
Protocol                   : 0x00
Max PacketSize0            : 64
Configurations             : 1
  Configuration            : 1 (0)
    Attributes             : 0xa0 (Bus-powered, Remote-wakeup)
    Max Power              : 450 mA

** start networking **
# io-pkt-v4 -d asix -ptcpip
# sloginfo
Time             Sev Major Minor Args
Jan 01 00:00:18    5    14     0 tcpip starting
Jan 01 00:00:18    3    14     0 Unable to attach to pci server: No such file or directory
Jan 01 00:00:18    3    14     0 Using pseudo random generator.  See "random" option
Jan 01 00:00:18    6    10     0 Chipset 88178
Jan 01 00:00:18    5    14     0 ax_enable_88178: eeprom index 0x17 is 0x1b
Jan 01 00:00:18    5    14     0 GPIO Setting 0x33133383

** use dhcp.client  - returns immediately only gives 0.0.0.0  **
# ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
        inet 127.0.0.1 netmask 0xff000000
en0: flags=80008802<BROADCAST,SIMPLEX,MULTICAST,SHIM> mtu 1500
        address: 80:3f:d5:08:3d:ba
        media: Ethernet 100baseTX full-duplex
        status: active
# dhcp.client &
[1] 40974
# ifconfig
ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
        inet 127.0.0.1 netmask 0xff000000
en0: flags=80008a43<UP,BROADCAST,RUNNING,ALLMULTI,SIMPLEX,MULTICAST,SHIM> mtu 1500
        address: 80:3f:d5:08:3d:ba
        media: Ethernet 100baseTX full-duplex
        status: active
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
[1] + Done                 dhcp.client

** nicinfo - device seems to send and receive something **
# nicinfo
en0:
  Asix Ethernet Controller

  Physical Node ID ........................... 803FD5 083DBA
  Current Physical Node ID ................... 803FD5 083DBA
  Current Operation Rate ..................... 100.00 Mb/s full-duplex
  Active Interface Type ...................... MII
    Active PHY address ....................... 2
  Maximum Transmittable data Unit ............ 1514
  Maximum Receivable data Unit ............... 1514
  Promiscuous Mode...