DFON             6409 dev/ic/aic79xx.c 	ahd_outb(ahd, SXFRCTL0, DFON);
DFON             4531 dev/ic/aic7xxx.c 		ahc_outb(ahc, SXFRCTL0, DFON|SPIOEN);
DFON             4548 dev/ic/aic7xxx.c 	ahc_outb(ahc, SXFRCTL0, DFON|SPIOEN);