TRANSCFG
temp = ioread32(csr_base + TRANSCFG);
iowrite32(temp | TRANSCFG_RX_WATER_MARK, csr_base + TRANSCFG);
ioread32(csr_base + TRANSCFG));
rx_watermark = ioread32(csr_base + TRANSCFG);
temp = ioread32(csr_base + TRANSCFG);
iowrite32(temp | rx_watermark, csr_base + TRANSCFG);