Kernel hangs early in boot just after printing "ACPI APIC Table: <APPLE Apple00>", and a few seconds later starts printing something so quickly I can't read it. Boot process does not continue. This sounds similar to bug 151385, but it's hard to tell if it's the same, and that bug is with an older kernel. Fix: Turning off SMP (setting kern.smp.disabled=1 in loader) causes the bug to go away. This is how I was able to test an installed system. Losing use of the second CPU is non-optimal, though. Alternatively, patching sys/amd64/amd64/machdep.c to add MacBook4,1 to the LEGACY_USB_EN blacklist makes the bug go away too. I haven't noticed any negative side effects. However, if I boot using grub2 instead of loader(8), the bug still manifests, even with this patch. Patch attached with submission follows: How-To-Repeat: Start up a MacBook4,1 from the FreeBSD-9.0-RELEASE-amd64-dvd1 DVD, observe that boot hangs and doesn't continue. Booting from an already installed FreeBSD 9.0 system will also produce this bug.
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This fix has already been committed to FreeBSD, and looks to have been in there for some time! Thanks!