BT_HOST_BUSY
#define BT_READY (BT_HOST_BUSY|BT_HOST2BMC_ATN|BT_BMC2HOST_ATN)
bt_write(sc, _BT_CTRL_REG, BT_HOST_BUSY);
bt_write(sc, _BT_CTRL_REG, BT_HOST_BUSY);
rv &= BT_HOST_BUSY;
printf(" HBSY : %2x\n", v & BT_HOST_BUSY);