SNDBDS_MODE
tw32(SNDBDS_MODE, SNDBDS_MODE_ENABLE | SNDBDS_MODE_ATTN_ENABLE);
tg3_rd32_loop(tp, regs, SNDBDS_MODE, 0x80);
err |= tg3_stop_block(tp, SNDBDS_MODE, SNDBDS_MODE_ENABLE, silent);