[issue806] boot error on MacBook

[Justin C. Sherrill]

Just to throw another bit of data in there: here's my MacBook Pro (first
gen) attempting to boot 1.10.1 without ACPI on:

http://www.shiningsilence.com/df_on_mbp.jpg (2048x1536 jpeg)

The same last few lines are what show with ACPI enabled.  I don't get the
db> prompt - it just stops on those last few livelock lines, and goes no
further for the minute or so that I've sat and watched it.