B43_MMIO_TSF_CFP_START
b43_write32(dev, B43_MMIO_TSF_CFP_START, (beacon_int << 10));
b43_write16(dev, B43_MMIO_TSF_CFP_START, 0xAAAA);
b43_write32(dev, B43_MMIO_TSF_CFP_START, 0xCCCCBBBB);
b43_write32(dev, B43_MMIO_TSF_CFP_START, 0);