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                            U-Boot中的驅動程序目錄如下（drivers）：
![](https://img.kancloud.cn/49/c0/49c05960e1829b3504521fcbe70ac1c6_832x194.png =600x)

### 

其中serial中存放的是串口相關的驅動源碼。
![](https://img.kancloud.cn/14/5f/145fe0ab9b7b7f2e0692a380e20ab576_832x242.png =600x)

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其中ns16550.c為串口驅動程序，采用的是DM的框架，我們可以在源碼中查看到相關的定義：
![](https://img.kancloud.cn/68/57/68571592e04a159583fb05bdfe70a485_832x298.png =600x)

### 

這里的U\_BOOT\_DRIVER其實是一個宏定義，這段代碼其實就是定義一個DM driver，見上節課DM中driver的結構。udevice最終會由一組API來訪問這個driver。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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