The problem turned out to be APM BIOS idle calls; IDE initialization
is the first point in the boot sequence when the CPU is idle long
enough to call the APM BIOS idler, which hangs. (This is on a
Chembook 3300T, built by Mitac for Chembook, Umax, and others.)
Building for SMP turns off BIOS idling, accidentally solving (or hiding)
the problem.
Nathan Myers
ncm@nospam.cantrip.org http://www.cantrip.org/
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