mips_ejtag_fdc_encode
word = mips_ejtag_fdc_encode(bufs, &kgdbfdc_wbuflen, 1);
word = mips_ejtag_fdc_encode(&buf_ptr, &buf_len, 1);
word = mips_ejtag_fdc_encode(ptrs, sizes, 1 + !!sizes[1]);