U-Boot在FL2440上移植（二）----支持NOR Flash

<一>选择NOR flash型号

我的开发板上的nor flash芯片是Intel的JS28F320(4MB)(1device=32blocks,1block=128MB

fl2440默认是nandflash启动，norflash启动只需将跳线帽J5拔掉就可以了

1. 把开发板的配置文件fl2440.h（/include/configs/fl2440.h)中关于flash的配置部分都删掉，换成下面的配置：

#define CONFIG_NR_DRAM_BANKS 1
#define PHYS_SDRAM_1 0x30000000
#define PHYS_SDRAM_1_SIZE 0x04000000
#define PHYS_FLASH_1 0x00000000
#define CFG_FLASH_BASE PHYS_FLASH_1
#define CFG_MONITOR_BASE TEXT_BASE
#define FLASH_BASE0_PRELIM PHYS_FLASH_1
#define CONFIG_SYS_FLASH_PROTECTION 1
#define CFG_MAX_FLASH_BANKS 1
#define CONFIG_SYS_FLASH_SIZE 0x00400000
#define CFG_MAX_FLASH_SECT 32
#define CFG_FLASH_ERASE_TOUT (2*CONFIG_SYS_HZ)

#define CONFIG_SYS_FLASH_WRITE_TOUT (2*CONFIG_SYS_HZ)

#define CFG_ENV_IS_IN_FLASH 1
#define CFG_ENV_SIZE 0x20000
#define CFG_ENV_OFFSET 0x40000

#define CONFIG_SYS_HZ 1000

#endif

如果出现 警告： “no newline at end of file" 只需在这段代码后加几个回车就可以了

2. 把开发板目录下flash.c文件替换成下面的/board/cmi/下面的flash.c文件，然后删除这个write_short函数的申明和定义、删除write_buff函数。替换成下面的两个函数

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);

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;
}

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;
}

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;

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) {
printf("\nFlash write error x at address lx\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;
}

3. 修改board/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);

4. 修改flash.c文件中的一个宏定义：
把：
#define FLASH_BLOCK_SIZE 0x00010000
改为：
#define FLASH_BLOCK_SIZE 0x00020000

<二>执行make fl2440config 和 make all将生成的U-Boot.bin烧入norflash

NOR Flash常用命令 ：查看NOR flash信息 flinfo

加/解写保护命令 protect

擦出命令 erase

读norflash mm/cp

写norflash cp