U-boot-200908在FL2440上的移植（二）--uboot在norflash上运行

我的开发板上的norflash是Intel的JS28F320(4MB)(1device=32blocks,1block=128MB)

1.修改norflash的配置，在include/configs/fl2440.h中关于flash的配置部分都删掉，换成下面的配置：

/*-----------------------------------------------------------------------* Physical Memory Map*/#define CONFIG_NR_DRAM_BANKS     1            /* we have 1 bank of DRAM */#define PHYS_SDRAM_1          0x30000000        /* SDRAM Bank #1 */#define PHYS_SDRAM_1_SIZE     0x04000000        /* 64 MB */#define PHYS_FLASH_1         0x00000000          /* Flash Bank #1 */#define CONFIG_SYS_FLASH_BASE       PHYS_FLASH_1#define CONFIG_SYS_MONITOR_BASE    TEXT_BASE#define FLASH_BASE0_PRELIM           PHYS_FLASH_1/*------------------------------------------------------------* FLASH and environment organization*/#define CONFIG_SYS_FLASH_PROTECTION    1#define CONFIG_SYS_MAX_FLASH_BANKS     1       /*max number of memory banks*/#define CONFIG_SYS_FLASH_SIZE     0x00400000     /*4 MB*/#define CONFIG_SYS_MAX_FLASH_SECT     32     /*max number of sectors on one chip*//*timeout values are in ticks*/#define CONFIG_SYS_FLASH_ERASE_TOUT     (2*CONFIG_SYS_HZ) /*Timeout for Flash Erase*/#define CONFIG_SYS_FLASH_WRITE_TOUT     (2*CONFIG_SYS_HZ) /*Timeout for Flash Write*/#define CONFIG_ENV_IS_IN_FLASH     1#define CONFIG_ENV_SIZE         0x20000        /*128KB*/#define CONFIG_ENV_OFFSET      0x40000

2.下载到norflash需要进行底层的初始化，所以要删除之前在配置文件include/configs/fl2440.h中加入的两句：

//#define CONFIG_SKIP_LOWLEVEL_INIT      1    //#define CONFIG_SKIP_RELOCATE_UBOOT     1  

3.修改board/samsung/fl2440/lowlevel_init.S文件中SDARM刷新参数为：

#define REFCNT   1258    /* period=7.8125us, HCLK=405/4 Mhz, (2048+1-7.8125*405/4) */

4.修改flash型号相关文件：

(1).用board/cmi/flash.c文件替换board/samsung/fl2440/flash.c文件，使uboot支持Intel的JS28F320型号nor；

(2).修改board/samsung/fl2440/flash.c中函数申明：

static ulong flash_get_size   (vu_short *addr, flash_info_t *info);//static int    write_short (flash_info_t *info, ulong dest, ushort data);static int   write_word   (flash_info_t *info, ulong dest, ushort data);static void   flash_get_offsets (ulong base, flash_info_t *info);

(3).删除board/samsung/fl2440/flash.c中write_buff和write_short两个函数，用下面两个函数代替：

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt){    ulong cp, wp;    ushort data;    int l;    int i, rc;    wp = (addr & ~1);         /* get lower word aligned address */    /*     * handle unaligned start bytes     */    if ((l = addr - wp) != 0)    {       data = 0;       for (i=0, cp=wp; i<l; ++i, ++cp) {        data = (data >> 8) | (*(uchar *)cp << 8);       }       for (; i<2 && cnt>0; ++i) {      data = (data >> 8) | (*src++ << 8);      --cnt;      ++cp;       }       for (; cnt==0 && i<2; ++i, ++cp) {      data = (data >> 8) | (*(uchar *)cp << 8);       }       if ((rc = write_word(info, wp, data)) != 0) {      return (rc);       }       wp += 2;    }    /*     * handle word aligned part     */    while (cnt >= 2) {       data = *((vu_short*)src);       if ((rc = write_word(info, wp, data)) != 0) {       return (rc);       }       src += 2;       wp   += 2;       cnt -= 2;    }    if (cnt == 0) {       return ERR_OK;    }    /*     * handle unaligned tail bytes     */    data = 0;    for (i=0, cp=wp; i<2 && cnt>0; ++i, ++cp) {       data = (data >> 8) | (*src++ << 8);       --cnt;    }    for (; i<2; ++i, ++cp) {       data = (data >> 8) | (*(uchar *)cp << 8);    }    return write_word(info, wp, data);}

static int write_word (flash_info_t *info, ulong dest, ushort data) {    vu_short *addr = (vu_short *)dest, val;    int rc = ERR_OK;    int flag;    /* Check if Flash is (sufficiently) erased , fix by kavin*/    if ((*addr & data) != data)       return ERR_NOT_ERASED;    flag = disable_interrupts();    *addr = 0x50;    *addr = 0x40;    *addr = data;    reset_timer_masked();    while(((val = *addr) & 0x80) != 0x80)    {       if (get_timer_masked() > CONFIG_SYS_FLASH_WRITE_TOUT) {       rc = ERR_TIMOUT;       *addr = 0xB0;       goto outahere;       }    }    if(val & 0x1A) {         /* check for error */       printf("\nFlash write error %02x at address %08lx\n",            (int)val, (unsigned long)dest);       if(val & (1<<3)) {      printf("Voltage range error.\n");      rc = ERR_PROG_ERROR;      goto outahere;       }       if(val & (1<<1)) {      printf("Device protect error.\n");      rc = ERR_PROTECTED;      goto outahere;       }       if(val & (1<<4)) {      printf("Programming error.\n");      rc = ERR_PROG_ERROR;      goto outahere;       }       rc = ERR_PROG_ERROR;       goto outahere;    }outahere:    *addr = 0xFF;    if (flag)       enable_interrupts();    return rc;}

编译然后下载到norflash中就行了