bt_outb
bt_outb(bt, COMMAND_REG, BOP_START_MBOX);
bt_outb(bt, CONTROL_REG, RESET_INTR);
bt_outb(bt, CONTROL_REG, reset_type);
bt_outb(bt, COMMAND_REG, opcode);
bt_outb(bt, COMMAND_REG, *params++);
bt_outb(bt, COMMAND_REG, BOP_START_MBOX);