PC873_ECPCLK
if (pcr & PC873_ECPCLK) { /* XXX */
pcr |= (PC873_ECPEN | PC873_ECPCLK); /* XXX */
pcr &= ~(PC873_ECPEN | PC873_ECPCLK);
pcr &= ~(PC873_ECPEN | PC873_ECPCLK | PC873_EPPEN);