B53_SERDES_PAGE
b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, block);
b53_write16(dev, B53_SERDES_PAGE, offset, value);
b53_write16(dev, B53_SERDES_PAGE, B53_SERDES_BLKADDR, block);
b53_read16(dev, B53_SERDES_PAGE, offset, &value);