u-boot-2011.06在mini2440上的移植之Nor flash支持

发布时间：2020-12-15 06:09:35 所属栏目：百科来源：网络整理

导读：转载请注明出处http://blog.csdn.net/cneozhang/article/details/6693764，如有任何疑问，欢迎交流学习。源码可以到我的git仓库下载： [plain] view plain copy print ? git?clone?git://github.com/cneozhang/u-boot-2011.06-cneo.git?? git clone git://g

转载请注明出处http://blog.csdn.net/cneozhang/article/details/6693764，如有任何疑问，欢迎交流学习。

源码可以到我的git仓库下载：

[plain] view plain copy print ?

git?clone?git://github.com/cneozhang/u-boot-2011.06-cneo.git??

git clone git://github.com/cneozhang/u-boot-2011.06-cneo.git

一、清理编译环境

在上一篇，我们已经建立好了mini2440的开发环境，并且编译成功，为了有个干净的环境，我们先清理以下现场（不是必须的）：

在u-boot-2011.06根目录下：

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<pre?class="plain"?name="code">neo@neo-machine:~/u-boot-2-11.06$?make?distclean??

<pre class="plain" name="code">neo@neo-machine:~/u-boot-2-11.06$ make distclean

二、关于SST39LV1601 flash的一些特性：

重要需要了解的是，这款Nor flash兼容JEDEC接口方式，对于U-BOOT来说，如果直接定义成CFI接口方式的话，操作命令过程中，flash不能unlock。

FEATURES：

size：?? 1M x 16bit

sector：2KWord / sector

block： 32Kword / sector

Product identification

Software command sequence

三、更改代码：

1、更改include/configs/mini2440.h中关于nor flash的配置：
?

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/*-----------------------------------------------------------------------?
?*?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??
#define?CONFIG_FLASH_SHOW_PROGRESS??45??
#define?CONFIG_FLASH_CFI_MTD ??
??
#define?CONFIG_SYS_MAX_FLASH_BANKS??1??
#define?CONFIG_SYS_FLASH_BANKS_LIST?????{?CONFIG_SYS_FLASH_BASE?}??
#define?CONFIG_SYS_MAX_FLASH_SECT???(512)??
??
#define?CONFIG_ENV_ADDR?????????(CONFIG_SYS_FLASH_BASE?+?0x1f0000)?/*?at?the?end?block?*/??
#define?CONFIG_ENV_IS_IN_FLASH??
#define?CONFIG_ENV_SIZE?????????0x10000??

/*-----------------------------------------------------------------------
 * 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
#define CONFIG_FLASH_SHOW_PROGRESS	45
#define CONFIG_FLASH_CFI_MTD

#define CONFIG_SYS_MAX_FLASH_BANKS	1
#define CONFIG_SYS_FLASH_BANKS_LIST     { CONFIG_SYS_FLASH_BASE }
#define CONFIG_SYS_MAX_FLASH_SECT	(512)

#define CONFIG_ENV_ADDR			(CONFIG_SYS_FLASH_BASE + 0x1f0000) /* at the end block */
#define CONFIG_ENV_IS_IN_FLASH
#define CONFIG_ENV_SIZE			0x10000

1. 在drivers/mtd/cfi_flash.c文件中，unsigned long flash_init (void)函数说明：

flash设备通过flash_info[]数组管理每一个flash芯片（如一颗SST39LV1601芯片）信息，因为mini2440只用到一颗nor flash芯片（#define CONFIG_SYS_MAX_FLASH_BANKS??? 1），所以其实这个数组只有一个成员，flash info结构介绍如下：

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*-----------------------------------------------------------------------??
?*?FLASH?Info:?contains?chip?specific?data,?per?FLASH?bank??
?*/??
??
typedef?struct?{??
????ulong???size;???????????/*?total?bank?size?in?bytes?????*/??
????ushort??sector_count;???????/*?number?of?erase?units????????*/??
????ulong???flash_id;???????/*?combined?device?&?manufacturer?code??*/??
????ulong???start[CONFIG_SYS_MAX_FLASH_SECT];???/*?virtual?sector?start?address?*/??
????uchar???protect[CONFIG_SYS_MAX_FLASH_SECT];?/*?sector?protection?status?*/??
#ifdef?CONFIG_SYS_FLASH_CFI??
????uchar???portwidth;??????/*?the?width?of?the?port????????*/??
????uchar???chipwidth;??????/*?the?width?of?the?chip????????*/??
????ushort??buffer_size;????????/*?#?of?bytes?in?write?buffer???????*/??
????ulong???erase_blk_tout;?????/*?maximum?block?erase?timeout??????*/??
????ulong???write_tout;?????/*?maximum?write?timeout????????*/??
????ulong???buffer_write_tout;??/*?maximum?buffer?write?timeout?????*/??
????ushort??vendor;?????????/*?the?primary?vendor?id????????*/??
????ushort??cmd_reset;??????/*?vendor?specific?reset?command????*/??
????ushort??interface;??????/*?used?for?x8/x16?adjustments??????*/??
????ushort??legacy_unlock;??????/*?support?Intel?legacy?(un)locking?*/??
????ushort??manufacturer_id;????/*?manufacturer?id??????????*/??
????ushort??device_id;??????/*?device?id????????????????*/??
????ushort??device_id2;?????/*?extended?device?id???????????*/??
????ushort??ext_addr;???????/*?extended?query?table?address?????*/??
????ushort??cfi_version;????????/*?cfi?version??????????????*/??
????ushort??cfi_offset;?????/*?offset?for?cfi?query?????????*/??
????ulong???addr_unlock1;???????/*?unlock?address?1?for?AMD?flash?roms??*/??
????ulong???addr_unlock2;???????/*?unlock?address?2?for?AMD?flash?roms??*/??
????const?char?*name;???????/*?human-readable?name??????????????????*/??
#endif ??
}?flash_info_t;??

*-----------------------------------------------------------------------
 * FLASH Info: contains chip specific data,per FLASH bank
 */

typedef struct {
	ulong	size;			/* total bank size in bytes		*/
	ushort	sector_count;		/* number of erase units		*/
	ulong	flash_id;		/* combined device & manufacturer code	*/
	ulong	start[CONFIG_SYS_MAX_FLASH_SECT];   /* virtual sector start address */
	uchar	protect[CONFIG_SYS_MAX_FLASH_SECT]; /* sector protection status	*/
#ifdef CONFIG_SYS_FLASH_CFI
	uchar	portwidth;		/* the width of the port		*/
	uchar	chipwidth;		/* the width of the chip		*/
	ushort	buffer_size;		/* # of bytes in write buffer		*/
	ulong	erase_blk_tout;		/* maximum block erase timeout		*/
	ulong	write_tout;		/* maximum write timeout		*/
	ulong	buffer_write_tout;	/* maximum buffer write timeout		*/
	ushort	vendor;			/* the primary vendor id		*/
	ushort	cmd_reset;		/* vendor specific reset command	*/
	ushort	interface;		/* used for x8/x16 adjustments		*/
	ushort	legacy_unlock;		/* support Intel legacy (un)locking	*/
	ushort	manufacturer_id;	/* manufacturer id			*/
	ushort	device_id;		/* device id				*/
	ushort	device_id2;		/* extended device id			*/
	ushort	ext_addr;		/* extended query table address		*/
	ushort	cfi_version;		/* cfi version				*/
	ushort	cfi_offset;		/* offset for cfi query			*/
	ulong   addr_unlock1;		/* unlock address 1 for AMD flash roms  */
	ulong   addr_unlock2;		/* unlock address 2 for AMD flash roms  */
	const char *name;		/* human-readable name	                */
#endif
} flash_info_t;

调用关系：

flash_init() -->flash_detect_legacy(cfi_flash_bank_addr(i),i) 去探测目标板中是否存在nor flash芯片

static int flash_detect_legacy(phys_addr_t base,int banknum) -->flash_read_jedec_ids(info)获取JEDEC接口标准flash芯片的信息，并填充info->manufacturer_id和info->device_id

static int flash_detect_legacy(phys_addr_t base,int banknum) -->jedec_flash_match(info,info->start[0])去匹配获取到的id号是否与jedec_table中定义的成员匹配，如果匹配，继续填充flash_info的其他信息，并返回1表示detect成功。

2、我们观察jedec_teble[]定义时发现，里边并未定义SST39LV1601芯片，所以要将其增加进去。

3、将SST39LV1601增加进jedec_table[]成员：

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#ifdef?CONFIG_SYS_FLASH_LEGACY_1024Kx16??
????{??
????????.mfr_id?????=?(u16)SST_MANUFACT,??
????????.dev_id?????=?SST39VF1601,??
????????.name???????=?"SST?39LV1601",??
????????.uaddr??????=?{??
????????????[1]?=?MTD_UADDR_0x5555_0x2AAA?/*?x16?*/??
????????},??
????????.DevSize????=?SIZE_2MiB,??
????????.CmdSet?????=?P_ID_AMD_STD,??
????????.NumEraseRegions=?4,??
????????.regions????=?{??
????????????ERASEINFO(0x10000,6),??/*?6??blocks?*/??
????????????ERASEINFO(0x10000,10),?/*?10?blocks?*/??
????????????ERASEINFO(0x10000,15),?/*?15?blocks?*/??
????????????ERASEINFO(0x10000,1),??/*?1??blocks?*/??
????????}??
????},??
#endif??

#ifdef CONFIG_SYS_FLASH_LEGACY_1024Kx16
	{
		.mfr_id 	= (u16)SST_MANUFACT,.dev_id 	= SST39VF1601,.name		= "SST 39LV1601",.uaddr		= {
			[1] = MTD_UADDR_0x5555_0x2AAA /* x16 */
		},.DevSize	= SIZE_2MiB,.CmdSet 	= P_ID_AMD_STD,.NumEraseRegions= 4,.regions	= {
			ERASEINFO(0x10000,/* 6  blocks */
			ERASEINFO(0x10000,/* 10 blocks */
            ERASEINFO(0x10000,/* 15 blocks */
            ERASEINFO(0x10000,/* 1  blocks */
		}
	},#endif

至此，nor flash的支持代码已经增加完成

四、编译，烧录：

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neo@neo-machine:~/u-boot-2-11.06$?make?mini2440_config??
neo@neo-machine:~/u-boot-2-11.06$?make??

neo@neo-machine:~/u-boot-2-11.06$ make mini2440_config
neo@neo-machine:~/u-boot-2-11.06$ make

将u-boot.bin文件烧录进nor flash，启动，此时，串口打印信息已经可以正确识别到nor flash了：

试验：

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mini2440?#?flinfo??

mini2440 # flinfo

在执行flinfo命令时，可能会提示raise: Signal # 8 错误，请参考我转载的《u-boot-2011.06 raise: Signal # 8 错误修正》。

（编辑：李大同）

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