Help w/ wlan0 on an sl-6000L running oz354x and 2.6 kernel?

My wlan0 worked with recent (early June?) gpe-image builds, but after
checking out a newer tree it no longer works.  I've been searching
backwards to find an older tree that works, but I haven't hit the
sweetspot yet.

I'm running on an sl-6000l, using the org.openembedded.oz354x branch.
I'm building a 2.6 kernel as part of building a gpe-image
(bootstrap-image doesn't work either).

Based on http:/openzaurus.org/wordpress/installation/sl-6000, I'm
using the following as my /etc/network/interfaces (key0 isn't the real
key):

   # /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
    
   # The loopback interface
   auto lo
   iface lo inet loopback
   
   # Wireless interfaces
   # you may need to:
   #   modprobe ohci-hcd 
   # by hand before this will work.
   iface wlan0 inet dhcp
   	wireless_type wlan-ng
   	wireless_mode Managed
   	wireless_nick Zaurus
   	wireless_enc on
   	wlan_ng_default_key_id 0
   	wlan_ng_key0 00:00:00:00:00
     pre-up modprobe prism2_usb
     post-down rmmod prism2_usb
   
   # Wired or wireless interfaces
   iface eth0 inet dhcp
   iface eth1 inet dhcp
   
   # Zaurus usbnet
   iface usbd0 inet dhcp
   
   # usbnet from the other side
   iface usb0 inet dhcp
   
When I modprobe ohci-hcd the  wireless led turns green.

When I do an /sbin/ifup wlan0, udhcpc starts, then

  SIOCSIFFLAGS: No such device

is printed, then

  Sending discover...
  Sending discover...
  Sending discover...
  No lease, forking to background

/sbin/ifconfig wlan0 shows the device, but it's not up.  Trying to
force it up with "/sbin/ifconfig wlan0 up" says:

  SIOCSIFFLAGS: No such device

and there's no change in the ifconfig output.

/sbin/iwconfig reports:

  wlan0   no wireless extensions.

I'm not sure what changed or what I'm doing wrong.

Does anyone have any helpful advice?

Thanks,

g.