Hopefully the following should contain the missing detail you need...
As a starting point - Make sure that you can successfully get through Steps 1-3 of http://www.php.net/~rasmus/
ie: Make sure that you can get the IA-1 to boot a DOS formatted CF
Download the Midori3 buildkit from the linux file section of http://www.ia1hacking.com install the buildkit and build the image for hdc:
Note: - I am using Redhat 6.2 to build Midori - newer versions of Linux should also work
The following are the commands I used (all text from the '#' on are comments - do not type these)
su root # Yes - you must be root to unzip and build the midori image
bzcat build_kit_3.tar.bz2 | tar xvf -
xxd cramfsboot.bin > cramfsboot.bin.hex
emacs cramfsboot.bin.hex # Change byte at address 0x1fd from 0x03 to 0x16 with you preferred text editor
xxd -r cramfsboot.bin.hex > cramfsboot.bin
# Change all the "hda" references to "hdc" in the following scripts:
copy the image to the CF:
Note: - I use dolly under W98se with the CF loaded in a PCMCIA adapter seen as the 3rd drive (YSMV). I have my linux drive with the midori .img file mounted to my W98 machine using samba. Note that for dolly to work under all circumstances, W98 should be booted with the PCMCIA adapter+CF inserted. The DOS command line I use is:
dolly mid3hdc.img hd130:
Set the IA-1 Bios boot order to be A: first, C: second and D: Third, it will boot off of the CF if it is inserted and the internal Sandisk flash if there is no CF in the slot
Load the CF into the IA-1 and turn on the power.
You should see the familiar penguin logo and scrolling text of Midori booting - from hdc.
Please post if you need more detail on any of these steps or run into any roadblocks.