Sure. Follow these steps :
a) format an usb stick with fat or fat32 file system
b) put on the usb stick a file called debugchumby,created on a linux box :
#!/bin/sh
ssid="mario"
connect()
{
echo "scanning for access points"
/usr/chumby/scripts/ap_scan
echo "attempting to connect to $ssid"
killall wpa_supplicant
ifconfig wlan0 down
iwconfig wlan0 mode ad-hoc
iwconfig wlan0 essid "$ssid"
ifconfig wlan0 up
sleep 10
}
connect
while [ `iwconfig wlan0|grep ESSID|awk -F: '{print $2}'` != \"$ssid\" ]; do
connect
done
udhcpc -t 5 -n -p /var/run/udhcpc.wlan0.pid -i wlan0
# if you dont have a dhcp server running, comment the udhcpc line above and uncomment the following one
# ifconfig wlan0 10.10.10.2
c) attach the usb stick on the insignia infocast 8 and power it on
d) From the main screen (the screen with a black background and a left nav panel, not the home screen with the green background and a few icons in the middle), touch the Insignia logo, and an About dialog box pops up. Touch the “pi” icon in the top right near the close button, and you’ll get the old “Do you believe in the Users?” dialog box that you may recognize from other chumby devices. There, you can start sshd.
e) get putty from here :
http://www.chiark.greenend.org.uk/~sgtatham/putty/
f) ssh into the Infocast.