PKTPG_BUF_CFG
CS_WRITE_PACKET_PAGE(sc, PKTPG_BUF_CFG, BUF_CFG_TX_UNDR_IE |
CS_WRITE_PACKET_PAGE(sc, PKTPG_BUF_CFG,
CS_WRITE_PACKET_PAGE(sc, PKTPG_BUF_CFG, 0);