Assign start to the value we were able to allocate and use that to write out the BAR.  Otherwise, we were trying to shift a 32-bit quantity on 32-bit platforms.  Also, 'start' check sanity to where it is known.
Assign start to the value we were able to allocate and use that to
write out the BAR.  Otherwise, we were trying to shift a 32-bit
quantity on 32-bit platforms.  Also, 'start' check sanity to where it
is known.

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