the midway driver.. has the folowing comment.

            855: #ifdef NBURST
            856:   /* be careful. kernel stack is only 8K */
            857:   u_int8_t buffer[BOUNDARY * 2 + 64 * (NBURSTS + ....

well, that may have been true on NetBSD where this came from, but not in
FreeBSD.. Sure Upages is 2 but the U-area in it takes up 4.5 KB
leaving 3.5KB for the stack..

No matter, this is still probably not a good idea, even with 8K.
(they are allocating 2.3KB here.)

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