Document that boundaries cannot be smaller than the max segment size.
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@ -322,7 +322,8 @@ Boundary constraint, in bytes, of the target DMA memory region.
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The boundary indicates the set of addresses, all multiples of the
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boundary argument, that cannot be crossed by a single
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.Vt bus_dma_segment_t .
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The boundary must be a power of 2.
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The boundary must be a power of 2 and must be no smaller that the
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maximum segment size.
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.Ql 0
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indicates that there are no boundary restrictions.
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.It Fa lowaddr
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