MBOX_READ8
MBOX_READ8(sc, MBOX_I2A_RECV0),
MBOX_READ8(sc, MBOX_I2A_RECV1));
msg->data0 = MBOX_READ8(sc, MBOX_I2A_RECV0);
msg->data1 = MBOX_READ8(sc, MBOX_I2A_RECV1);