ENC_RX_BUF_START
if (newrxtail == ENC_RX_BUF_START)
encx24j600_write_reg(priv, ERXST, ENC_RX_BUF_START);
encx24j600_write_reg(priv, ERXRDPT, ENC_RX_BUF_START);
priv->next_packet = ENC_RX_BUF_START;