new_blk
bb = new_blk(0, 0, (uint16_t)body_size);
bb = new_blk(DEVPATH_TYPE_MEDIA, 1, sizeof(*pp));
bb = new_blk(DEVPATH_TYPE_MEDIA, 4, (uint16_t)len);
bb = new_blk(DEVPATH_TYPE_END, 0xff, sizeof(*bb->u.path));
bb = new_blk(0, 0, 0);