bge_phydsp_write
void bge_phydsp_write(bge_t *bgep, bge_regno_t regno, uint16_t value);
bge_phydsp_write(bgep, MII_DSP_TAP26, mii_val);
bge_phydsp_write(bgep, MII_DSP_CH34TP2,
bge_phydsp_write(bgep, MII_DSP_TAP26, 0);
bge_phydsp_write(bgep, MII_DSP_TAP26,