PXCAB is the IBM reference design that
the card was derived from, so that should work perfectly.
Unicamp has a mirror of drivers for the PXCAB, which match some of the bits from the manual's Appendix A;
http://ftp.unicamp.br/pub/linuxpatch/pxcab/Fedora7/ppc64/I believe Appendix A is only necessary if you'd rather run Fedora 7 or another Fedora 7 derivative instead of YDL... which is itself a Fedora/RHEL derived distro. I'd imagine YDL is better supported for the card, as Fixstars bought the Yellow Dog folks, but you never know...
EDIT: It also looks like pxcab-pcie-driver-1.1.0-0.src.rpm from the Unicamp mirror has all the GPLed source code for PCIe drivers mentioned in Section 7 (apnet and axon via triblade), so I guess I was mistaken! There might be a shot at getting all this running.