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TDA2PXEVM: network_txlink change: add a packet to send to PC,

Part Number: TDA2PXEVM

hi,I change the tx_link to send a packet refrered a start of a frame.the c file is networkTxLink_drv.c,my code is added here

Int32 NetworkTxLink_drvWritePayload(NetworkTxLink_Obj *pObj,
                        NetworkTxLink_NetworkTxObj *pNetTxObj,
                        UInt32 numBuf,
                        UInt8  *bufAddr[],
                        UInt32 bufSize[])
{
  ------is it a right place?
but  the result did'nt work well.
my code is
Uint bufAddr_head[4]={0xFF,0xFF,0xFF,0xFF},
...                        status = Network_tfdtpWrite(&pNetTxObj->sockObj,
                               bufAddr_head,
                                4
                                );
Please help me with my problem