B0_IMSK
CSR_WRITE_4(dev, B0_IMSK, 0);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, 0);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, 0);
CSR_WRITE_4(dev, B0_IMSK, Y2_IS_HW_ERR | Y2_IS_STAT_BMU);
CSR_WRITE_4(dev, B0_IMSK, dev->d_intrmask);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, dev->d_intrmask);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, dev->d_intrmask);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, dev->d_intrmask);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, 0);
(void) CSR_READ_4(dev, B0_IMSK);
CSR_WRITE_4(dev, B0_IMSK, 0);
(void) CSR_READ_4(dev, B0_IMSK);