boot images tp400

I need to build a boot image for the tp400 from Dspdesign. There is a board
support package from QNX including a
/usr/src/DSPDESIGN/LP400QNX/bootfilestp400-32m.bld. This is for 32M CF
cards, the image supplied tp400-32m.img does not work on my new 128M flash.

How can I re-build the .img for a different sized card ?

Thanks in advance