TQ2440移植u-boot2016.11全过程记录-【3】NOR FLASH驱动移植

忘是亡心i 2023-07-17 15:56 121阅读 0赞

# TQ2440移植u-boot2016.11 NOR FLASH驱动移植 #

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**TQ2440开发板上板载一片NOR FLASH，型号为`EON EN29LV160AB`，挂载到了0x0000\_0000~0x001F\_FFFF地址，2M字节，16bit位宽。**

**编辑配置头文件：**

**`gedit include/configs/tq2440.h`**

**定位到NOR Flash的配置宏：**

/*----------------------------------------------------------------------- * FLASH and environment organization */
    
    #define CONFIG_SYS_FLASH_CFI
    #define CONFIG_FLASH_CFI_DRIVER
    #define CONFIG_FLASH_CFI_LEGACY
    #define CONFIG_SYS_FLASH_LEGACY_512Kx16
    #define CONFIG_FLASH_SHOW_PROGRESS 45
    
    #define CONFIG_SYS_MAX_FLASH_BANKS 1
    #define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
    #define CONFIG_SYS_MAX_FLASH_SECT (19)
    
    #define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x070000)
    #define CONFIG_ENV_IS_IN_FLASH
    #define CONFIG_ENV_SIZE 0x10000
    /* allow to overwrite serial and ethaddr */
    #define CONFIG_ENV_OVERWRITE

**替换为：**

/*----------------------------------------------------------------------- * FLASH and environment organization */
     
    #define CONFIG_SYS_FLASH_CFI
    #define CONFIG_FLASH_CFI_DRIVER
    #define CONFIG_FLASH_CFI_LEGACY
    #define CONFIG_SYS_FLASH_LEGACY_1024Kx16 /* NOR FLASH 大小为2M字节，16位宽 */
    #define CONFIG_FLASH_SHOW_PROGRESS 45
    
    #define CONFIG_SYS_MAX_FLASH_BANKS 1 /* NOR FLASH 数量，TQ2440板子上只有一个 */
    #define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
    #define CONFIG_SYS_MAX_FLASH_SECT (35) /* NOR FLASH 扇区数目 */
    
    #define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + 0x100000) /* 环境变量保存位置 */
    #define CONFIG_ENV_IS_IN_FLASH /* 定义该宏后环境变量保存入NOR FLASH */
    #define CONFIG_ENV_SIZE 0x10000 /* 环境变量大小为64K */
    #define CONFIG_ENV_OVERWRITE /* 允许覆写环境变量 */

**其中`CONFIG_ENV_ADDR`定义了环境变量保存的位置，使用命令`ls -hl u-boot.bin`查看一下u-boot的大小为521K大小，那么环境变量的位置就必须大于这个地址，否则就会把u-boot的内存覆盖掉，这里我设置的为`0x100000`，在NOR Flash的1M地址处保存环境变量。**

**添加TQ2440板子上的NOR Flash的初始化选项：**

**`gedit drivers/mtd/jedec_flash.c`**

**找到`jedec_table`这个数组，在该数组末尾加入以下代码：**

#ifdef CONFIG_SYS_FLASH_LEGACY_1024Kx16
    	{ 
    		.mfr_id 	= 0x1C,
    		.dev_id 	= 0x2249,
    		.name		= "EON EN29LV160AB",
    		.uaddr		= { 
    			[1] = MTD_UADDR_0x0555_0x02AA	/* x16 */
    		},
    		.DevSize		= SIZE_2MiB,
    		.CmdSet 		= P_ID_AMD_STD,
    		.NumEraseRegions	= 4,
    		.regions		= { 
    			ERASEINFO(0x04000, 1),
    			ERASEINFO(0x02000, 2),
    			ERASEINFO(0x08000, 1),
    			ERASEINFO(0x10000, 31),
    		}
    	},
    #endif

**编译后使用tftp下载到开发板0x30008000处可以并go到0x30008000地址处运行程序，可以看到已经正确识别出Nor Flash的大小：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMTUzNDcxNTAz_size_16_color_FFFFFF_t_70]

**下面测试一下NOR FLASH的读写：**

*  **去除写保护：**  
    `protect off all`
 *  **擦除从0x100000地址开始的64K，从0x100000地址处开始是为了避开自带的u-boot：**  
    `erase 0x100000 +0x10000`  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMTUzNDcxNTAz_size_16_color_FFFFFF_t_70 1]
 *  **拷贝内存64K的内容到NOR FLASH：**  
    `cp.b 0x30008000 0x100000 0x10000`  
    ![在这里插入图片描述][20200323103624768.png]
 *  **读取Nor Flash 64K内容到内存：**  
    `cp.b 0x100000 0x30108000 0x10000`
 *  **比较64K数据：**  
    `cmp.b 0x30108000 0x30008000 0x10000`

**读出的与写入的一致，测试通过：**  
![在这里插入图片描述][20200323104046344.png]

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ends…

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMTUzNDcxNTAz_size_16_color_FFFFFF_t_70 1]: /images/20230528/fcb8fcd478584d9f8cf79ea8dde528af.png
[20200323103624768.png]: /images/20230528/eece66ae44954df4a4cb313d43c0abd7.png
[20200323104046344.png]: /images/20230528/840b74cd138e4b94936394557b2fe9c5.png