移植u-boot12.04到jz2440 -->支持nandflash启动
发布时间：2020-12-15 20:01:17 所属栏目：百科 来源：网络整理
导读：u-boot2012.04支持nandflash 1. 重新添加#define CONFIG_CONFIG_CMD ?? ?driversmtdnand ?? ?下s3c2410_nand.c 拷贝为s3c2440_nand.c ?? ? ?? ? 怎么决定编译s3c2440_nand.c 而不编译 s3c2410-nand.c ?? ? ?? ? 看文件下的Makefile 找到相应的配置文件 ??
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u-boot2012.04支持nandflash
1. 重新添加#define CONFIG_CONFIG_CMD ?? ?driversmtdnand ?? ?下s3c2410_nand.c 拷贝为s3c2440_nand.c ?? ? ?? ? 怎么决定编译s3c2440_nand.c 而不编译 s3c2410-nand.c ?? ? ?? ? 看文件下的Makefile 找到相应的配置文件 ?? ?? 配置文件添加 ?? ?? #define CONFIG_NAND_S3C2440 ?? ??? ?#define CONFIG_SYS_S3C2440_NAND_HWECC ?? ??? ? ?? ? ?? ?Makefile中添加 以下代码 ?? ??? ? ?? ??? ?? COBJS-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o? ? ?? ??? ? ?
board_init_r
#if defined(CONFIG_CMD_NAND)
puts("NAND: ");
nand_init(); /* go init the NAND */
#endif
void nand_init(void) Nand.c (driversmtdnand
nand_init_chip(i);
board_nand_init //设置nand_chip 结构体。提供底层函数
nand->select_chip = NULL;
nand->cmd_ctrl = s3c2440_hwcontrol;
nand->dev_ready = s3c2440_dev_ready;
nand_scan
nand_scan_ident
nand_set_defaults(chip,busw);
chip->select_chip = nand_select_chip;
chip->cmdfunc = nand_command;
nand_get_flash_type
chip->select_chip(mtd,0);
chip->cmdfunc(mtd,NAND_CMD_RESET,-1,-1);
nand_command (struct mtd_info *mtd,unsigned int command,int column,int page_addr)// 发地址，发命令
chip->cmd_ctrl(mtd,command,ctrl);
s3c2440_hwcontrol
static void s3c2440_hwcontrol(struct mtd_info *mtd,int cmd,unsigned int ctrl)
chip->cmdfunc(mtd,NAND_CMD_READID,0x00,-1);
*maf_id = chip->read_byte(mtd);
*dev_id = chip->read_byte(mtd);
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?int board_nand_init(struct nand_chip *nand) ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?//初始化 ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?cfg = ((tacls-1) <<12) |( (twrph0-1) << 8) | ((twrph1 - 1) << 4 ); ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?writel(cfg,&nand_reg->nfconf); ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?/* 使能NAND Flash控制器,初始化ECC,禁止片选 */ ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?//writel ((1<<4)|(1<<1)|(1<<0),nand_reg->nfcont); ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?writel ((1<<4)|(1<<1)|(1<<0),&nand_reg->nfcont); ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? s3c2440_hwcontrol 自己重写
struct nand_chip *chip = mtd->priv;
struct s3c2440_nand *nand = s3c2440_get_base_nand();
if(ctrl & NAND_CLE)
{
/*发命令*/
writeb(dat,&nand->nfcmd);
}
else if(ctrl & NAND_ALE)
{
/*发地址*/
writeb(dat,&nand->nfaddr);// 地址
}
自己编写 s3c2440_nand_select 函数
struct s3c2440_nand *nand = s3c2440_get_base_nand();
switch (chipnr) {
case -1: /*不选*/
nand->nfcont |= (1 <<1);
break;
case 0: /*选中，没有进行操作*/
nand->nfcont &= ~(1 <<1);
break;
default:
BUG();
}
?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ? ?? ??? ??? ??? ??? ??? ??? ??? ?nor 启动 ?? ??? ??? ??? ??? ??? ?? U-Boot 2012.04.01 (Jul 23 2016 - 13:18:18)
CPUID: 32440001
FCLK: 400 MHz
HCLK: 100 MHz
PCLK: 50 MHz
DRAM: 64 MiB
WARNING: Caches not enabled
Flash: 2 MiB
NAND: 256 MiB //能够识别出 nand
*** Warning - bad CRC,using default environment
In: serial
Out: serial
Err: serial
Net: CS8900-0
nand erease 0 80000
nand write 0 0 80000 0：nor 0 nand 80000 长度
nand read 30000000 0 80000//3000000 读到哪里 0 从nand 0 开始读 80000 读的长度
cmp.b 0 30000000
U-Boot 2012.04.01 (Jul 23 2016 - 13:18:18)
nand 启动
CPUID: 32440001
FCLK: 400 MHz
HCLK: 100 MHz
PCLK: 50 MHz
DRAM: 64 MiB
WARNING: Caches not enabled
Flash: 0 KB // nand 启动0 地址对应片内内存，无法读取 nor flash的值
NAND: 256 MiB
*** Warning - bad CRC,using default environment
In: serial
Out: serial
Err: serial
Net: CS8900-0
SMDK2410 #
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