FC5test3 installer hangs "running /sbin/loader"

[John Reiser]

The installer hangs "running /sbin/loader" on i686 using the FC5test3 DVD.
Almost certianly, this is the same as the long-running bug:
  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=179601
which is hardware-specific to SiS 730 chipset.
Old kernel-2.6.15-1.1826.2.10_FC5 runs properly.

I have some time to debug this, but I'd like a pointer or two
to help me get started on the right path from the top.
The leading suspect is USB probing and/or related stuff.
Does gitbisect work here?  Please suggest; thanks.

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