fpga_mgr_write_init_buf
return fpga_mgr_write_init_buf(mgr, info, NULL, 0);
ret = fpga_mgr_write_init_buf(mgr, info, miter.addr,
ret = fpga_mgr_write_init_buf(mgr, info, buf, len);
ret = fpga_mgr_write_init_buf(mgr, info, buf, count);