CHIPGCR_FCGMII
BYTE_REG_BITS_OFF(CHIPGCR_FCGMII, ®s->CHIPGCR);
GCR = (GCR & ~CHIPGCR_FCGMII) | CHIPGCR_FCFDX;
CHIPGCR |= CHIPGCR_FCGMII;
CHIPGCR &= ~CHIPGCR_FCGMII;