FR_AB_XX_SD_CTL
ef4_reado(efx, ®, FR_AB_XX_SD_CTL);
ef4_reado(efx, ®, FR_AB_XX_SD_CTL);
ef4_writeo(efx, ®, FR_AB_XX_SD_CTL);
{ FR_AB_XX_SD_CTL,
ef4_reado(efx, &sdctl, FR_AB_XX_SD_CTL);
ef4_writeo(efx, &sdctl, FR_AB_XX_SD_CTL);