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Send function segment buf address is invalid


Upon completing the eth0 initialization, eCos calls my send function. This
is partial code of my mips send function. memcpy fails because the address
of sg_list->buf passed is invalid. I checked it and it is
Hex: FFFF FFFF 8007 98D6

Can someone help me to see why such invalid address is passed. Thanks.

Michael


         for (last_sg = &sg_list[sg_len]; sg_list < last_sg; sg_list++) {
	    cyg_uint8 *from_p;
	    int l;

	    from_p = (cyg_uint8 *)(sg_list->buf); //invalid address here
	    l = sg_list->len;

	    if (l > total_len)
	       l = total_len;
	    memcpy((unsigned char *)to_p, from_p, l);

	    to_p += l;
	    total_len -= l;

	    if (total_len < 0)
	       continue; // Should exit via sg_last normally
	  }


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