MIIMCOM
uint32_t miimcom = etsec_mdio_read(mdio, MIIMCOM);
etsec_mdio_write(mdio, MIIMCOM, 0); /* clear any past bits */
etsec_mdio_write(mdio, MIIMCOM, MIIMCOM_READ);
etsec_mdio_write(mdio, MIIMCOM, miimcom);
uint32_t miimcom = etsec_mdio_read(mdio, MIIMCOM);
etsec_mdio_write(mdio, MIIMCOM, 0); /* clear any past bits */
etsec_mdio_write(mdio, MIIMCOM, miimcom);