dear andy, i have same error (boot stop on "using 16384 buffer headers and 4096 cluster IO buffer headers") after i do fresh install my hack, and using this kernel.

i can boot with "cpus=1" boot arg.

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MacOS X 10.5.8
Biostar TA770 A2+ [AMD770/SB600]
Athlon64 X2 6000+
4096 MB Corsair DDRII 800MHz
Biostar 9600GT [EFI]
Weastern Digital 320 GB SATA II
Seagate 80 GB SATA II
ASUS 1814BLT SATA
VIA PCI USB Add-on