pkgsrc/sysutils/ipw-firmware/files
..
README

Firmware binary images for use with the ipw(4) driver.

Original archive is available from Intel at:
http://ipw2100.sourceforge.net/firmware.php?fid=3

There are three different images:
ipw2100-1.2.fw      BSS mode (connection to an access point) firmware
ipw2100-1.2-i.fw    IBSS mode (point-to-point connection) firmware
ipw2100-1.2-p.fw    Monitor mode firmware

To download one of those images to your adapter, use the ipwctl(8) command.