cs_writereg
cs_writereg(sc, PKTPG_EEPROM_CMD, EEPROM_WRITE_ENABLE);
cs_writereg(sc, PKTPG_EEPROM_DATA, data);
cs_writereg(sc, PKTPG_EEPROM_CMD, EEPROM_CMD_WRITE | offset);
cs_writereg(sc, PKTPG_EEPROM_CMD, EEPROM_WRITE_DISABLE);
cs_writereg(sc, PKTPG_EEPROM_CMD, EEPROM_CMD_READ | offset);