SHARED_DATA_ADDR
ahd_outl(ahd, SHARED_DATA_ADDR, busaddr);
ahc_outb(ahc, SHARED_DATA_ADDR, physaddr & 0xFF);
ahc_outb(ahc, SHARED_DATA_ADDR + 1, (physaddr >> 8) & 0xFF);
ahc_outb(ahc, SHARED_DATA_ADDR + 2, (physaddr >> 16) & 0xFF);
ahc_outb(ahc, SHARED_DATA_ADDR + 3, (physaddr >> 24) & 0xFF);