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        /*
         * much of this is inspired by the freebsd driver,
         * but is hard to understand due to lack of documentation.
         *
         * only pci irqs 0-2 are valid.
         * 0 seems to yield INTR6.
         * pci irqs 1-2 yield spurious ether intrs.
         */
        i = 0;
        *Pciintrsts = 0;
        *Pciintrmask = 1 << i;
        junk = *Pciintrmask;            /* flush the write */