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

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：

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：

 

<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：
 

/*-----------------------------------------------------------------------
 * 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：

*-----------------------------------------------------------------------
 * 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：

#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), /* 6 blocks */ ERASEINFO(0x10000,10), /* 10 blocks */ ERASEINFO(0x10000,15), /* 15 blocks */ ERASEINFO(0x10000,1), /* 1 blocks */ } }, #endif

至此，nor flash的支持代码已经增加完成

四、编译，烧录：

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：

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》。