fdt_create
err = fdt_create(root, PAGE_SIZE);
err = fdt_create(fdt_out, LUO_FDT_SIZE);
err = fdt_create(fdt, fdt_size);
err |= fdt_create(fdt, PAGE_SIZE);
err = fdt_create(buf, bufsize);
int fdt_create(void *buf, int bufsize);