dcb_gpio_table
u16 dcb_gpio_table(struct nvkm_bios *, u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
gpio = dcb_gpio_table(bios, ver, &hdr, &cnt, len);
u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);