SPD_HDD_IO_BASE
wdr->cmd_iohs[i] = SPD_HDD_IO_BASE + i * 2; /* wdc register is 16 bit wide. */
wdr->ctl_ioh = SPD_HDD_IO_BASE + WDC_SPD_HDD_AUXREG_OFFSET;
wdr->data32ioh = SPD_HDD_IO_BASE;