SCMD_REG_E_BUS_SPEED
err = (*(fb->func_phy_read))(fd, debug, 0, SCMD_REG_E_BUS_SPEED, SCMD_REG_E_BUS_SPEED, &b);
err = (*(fb->func_phy_write))(fd, debug, 0, SCMD_REG_E_BUS_SPEED, speed);