Joe, look in linux/arch/arm/include/asm/delay.h. The macro udelay
cannot handle large values because of lost-of-precision.

IMHO udelay on ARM is broken, because it also cannot work with fast
ARM processors (where bogomips >= 3355, which is in sight now). It's
just not broken enought that someone did something against it ...   so
the current kludge is good enought.
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