Hello Gary and others,

Gary,
thanks for your help, I think I came close to the root of the trouble.(I 
hope)

I discovered(to the truth,I dicovered previously) received data upsidedown.
Please refer to 809-line in last-sent output log

8C05ECEC: FF FF FF FF FF FF 15 00  6D C5 F0 23 06 08        |........m..#.. 
|

Whereas host sends.
0000  ff ff ff ff ff ff 00 15  c5 6d 23 f0 08 06 00 01   ........ .m#.....
0010  08 00 06 04 00 01 00 15  c5 6d 23 f0 ac 10 01 1c   ........ .m#.....
0020  00 00 00 00 00 00 ac 10  01 1c                     ........ ..

ARP command should be 08 06.

(I am very sorry if it deliberately display them in little endian form.)

I thought I could amend this and I amended(I thought) like next in
\packages\devs\eth\smsc\lan91cxx\current\src\if_lan91cxx.c.
(I risk of appearing stupid but I henestly tell what I did.)
cyg_uint8 get_data_byte(struct eth_drv_sc *sc)
{
    //20070919
    int sf;

    cyg_uint8 c;
    struct lan91cxx_priv_data *cpd =
        (struct lan91cxx_priv_data *)sc->driver_private;

//    //20070919
//    db_printf("cpd->data_pos=%d rxd_t=%d\n",cpd->data_pos,sizeof(rxd_t));

    if( cpd->data_pos == sizeof(rxd_t) )
    {
        cpd->data_buf = get_data(sc);
        cpd->data_pos = 0;
        //20070919
        sf = 1;
    }
    //20070919 begin
    else{
        sf = 0;
  }
    //20070919 end

    //20070919 begin
//ORG    c = (cpd->data_buf>>(cpd->data_pos*8))&0xFF;
    c = (cpd->data_buf>>(sf*8))&0xFF;

//    //20070919
//    db_printf("cpd->data_buf=%x c=%x\n",cpd->data_buf,c);

    cpd->data_pos++;

    return c;

}

After that I ran and stored output log(I send gzip file).
To my astonishment,I found RxEvent errored.
Please refer to 795-line.
RxEvent - bad rx: stat: 0x7f40, len: 0x41fa

Apparantly I wrongly concocted.
I am still tracing source but I haven't found smart answer.
Even if I thought I could have corrected it myself,
I worries that my bad coding affects anywhere else.

Please teach me how to best amend this behaviour.
(I am afraid this time also I am missing target.)

I honestly hope this breaks the stagnation.

I would appreciate your reply.
Thanks in advance.

Masahiro Ariga