ECR_TST
ECR_WRITE(pb, ECR_TST << 5); /* TEST FIFO */
frob_set_mode(pb, ECR_TST); /* Test FIFO */
ECR_WRITE(pb, (ECR_TST << 5) | 0x04);
ECR_WRITE(pb, ECR_TST << 5);
frob_set_mode(port, ECR_TST);
frob_set_mode(port, ECR_TST);