Rev,
I don't see ICS9LPRS18BKL on the setfsb clock gen pulldown, I'm using setfsb_2_1_100_0. I see something close, ICS9LPRS918BKL, which semi works. That is, it finds current fsb correctly, but any adjustment up or down results immediately in bclk=210. From there, I can go down only to 209, or up as high as I want. So it does work, but you're limited to Bclk=209 or greater.
Is ICS9LPRS18BKL the correct part number? If so, how did you get it?