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