(一)拷贝s3c2410_nand.c为s3c2440_nand.c
1、分析nand_init的过程
drivers/mtd/nand.c
nand_init
nand_init_chip
board_nand_init
设置nand_chip结构体, 提供底层的操作函数
nand_scan
nand_scan_ident
nand_set_defaults
chip->select_chip = nand_select_chip;
chip->cmdfunc = nand_command;
chip->read_byte = busw ? nand_read_byte16 : nand_read_byte;
nand_get_flash_type
chip->select_chip
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
nand_command() // 即可以用来发命令,也可以用来发列地址(页内地址)、行地址(哪一页)
chip->cmd_ctrl
s3c24x0_hwcontrol
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
*maf_id = chip->read_byte(mtd);
*dev_id = chip->read_byte(mtd);
2、拷贝drivers/mtd/nand/s3c2410_nand.c 为 drivers/mtd/nand/s3c2440_nand.c
book@ubuntu:~/u-boot-2016.11$ cd drivers/mtd/nand/
book@ubuntu:~/u-boot-2016.11/drivers/mtd/nand$ cp s3c2410_nand.c s3c2440_nand.c
3、修改drivers/mtd/nand/Makefile
diff -urN u-boot-2016.11/drivers/mtd/nand/Makefile u-boot-2016.11_s3c2440/drivers/mtd/nand/Makefile
--- u-boot-2016.11/drivers/mtd/nand/Makefile 2016-11-15 00:27:11.000000000 +0800
+++ u-boot-2016.11_s3c2440/drivers/mtd/nand/Makefile 2018-06-15 17:51:34.163161976 +0800
@@ -61,6 +61,7 @@
obj-$(CONFIG_NAND_NDFC) += ndfc.o
obj-$(CONFIG_NAND_PXA3XX) += pxa3xx_nand.o
obj-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o
+obj-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o
obj-$(CONFIG_NAND_SPEAR) += spr_nand.o
obj-$(CONFIG_TEGRA_NAND) += tegra_nand.o
obj-$(CONFIG_NAND_OMAP_GPMC) += omap_gpmc.o
4、修改 include/configs/smdk2440.h
diff -urN u-boot-2016.11/include/configs/smdk2440.h u-boot-2016.11_s3c2440/include/configs/smdk2440.h
--- u-boot-2016.11/include/configs/smdk2440.h 2018-06-15 17:39:18.867161976 +0800
+++ u-boot-2016.11_s3c2440/include/configs/smdk2440.h 2018-06-15 18:30:38.719161976 +0800
@@ -156,8 +156,8 @@
* NAND configuration
*/
#ifdef CONFIG_CMD_NAND
-#define CONFIG_NAND_S3C2410
-#define CONFIG_SYS_S3C2410_NAND_HWECC
+#define CONFIG_NAND_S3C2440
+#define CONFIG_SYS_S3C2440_NAND_HWECC
#define CONFIG_SYS_MAX_NAND_DEVICE 1
#define CONFIG_SYS_NAND_BASE 0x4E000000
#endif
5、修改scripts/config_whitelist.txt
diff -urN u-boot-2016.11/scripts/config_whitelist.txt u-boot-2016.11_s3c2440/scripts/config_whitelist.txt
--- u-boot-2016.11/scripts/config_whitelist.txt 2018-06-14 22:37:01.047660155 +0800
+++ u-boot-2016.11_s3c2440/scripts/config_whitelist.txt 2018-06-15 18:28:58.111161976 +0800
@@ -3312,6 +3312,7 @@
CONFIG_NAND_OMAP_GPMC_WSCFG
CONFIG_NAND_PLAT
CONFIG_NAND_S3C2410
+CONFIG_NAND_S3C2440
CONFIG_NAND_SECBOOT
CONFIG_NAND_SPL
CONFIG_NAND_U_BOOT
@@ -7396,6 +7397,7 @@
CONFIG_SYS_RV3029_TCR
CONFIG_SYS_RX_ETH_BUFFER
CONFIG_SYS_S3C2410_NAND_HWECC
+CONFIG_SYS_S3C2440_NAND_HWECC
CONFIG_SYS_SATA
CONFIG_SYS_SATA1
CONFIG_SYS_SATA1_FLAGS
(二)u-boot识别Nand Flash
1、修改drivers/mtd/nand/s3c2440_nand.c
diff -urN u-boot-2016.11/drivers/mtd/nand/s3c2440_nand.c u-boot-2016.11_s3c2440/drivers/mtd/nand/s3c2440_nand.c
--- u-boot-2016.11/drivers/mtd/nand/s3c2440_nand.c 2018-06-15 18:56:03.043161976 +0800
+++ u-boot-2016.11_s3c2440/drivers/mtd/nand/s3c2440_nand.c 2018-06-15 18:55:18.563161976 +0800
@@ -40,31 +40,21 @@
static void s3c24x0_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
- struct nand_chip *chip = mtd_to_nand(mtd);
struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
debug("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);
- if (ctrl & NAND_CTRL_CHANGE) {
- ulong IO_ADDR_W = (ulong)nand;
-
- if (!(ctrl & NAND_CLE))
- IO_ADDR_W |= S3C2410_ADDR_NCLE;
- if (!(ctrl & NAND_ALE))
- IO_ADDR_W |= S3C2410_ADDR_NALE;
-
- chip->IO_ADDR_W = (void *)IO_ADDR_W;
-
- if (ctrl & NAND_NCE)
- writel(readl(&nand->nfconf) & ~S3C2410_NFCONF_nFCE,
- &nand->nfconf);
- else
- writel(readl(&nand->nfconf) | S3C2410_NFCONF_nFCE,
- &nand->nfconf);
+ if (ctrl & NAND_CLE)
+ {
+ /* 发命令 */
+ writeb(cmd, &nand->nfcmd);
+ }
+ else if(ctrl & NAND_ALE)
+ {
+ /* 发地址 */
+ writeb(cmd, &nand->nfaddr);
}
- if (cmd != NAND_CMD_NONE)
- writeb(cmd, chip->IO_ADDR_W);
}
static int s3c24x0_dev_ready(struct mtd_info *mtd)
@@ -74,39 +64,22 @@
return readl(&nand->nfstat) & 0x01;
}
-#ifdef CONFIG_S3C2410_NAND_HWECC
-void s3c24x0_nand_enable_hwecc(struct mtd_info *mtd, int mode)
-{
- struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
- debug("s3c24x0_nand_enable_hwecc(%p, %d)\n", mtd, mode);
- writel(readl(&nand->nfconf) | S3C2410_NFCONF_INITECC, &nand->nfconf);
-}
-
-static int s3c24x0_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
- u_char *ecc_code)
+static void s3c2440_nand_select(struct mtd_info *mtd, int chipnr)
{
struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
- ecc_code[0] = readb(&nand->nfecc);
- ecc_code[1] = readb(&nand->nfecc + 1);
- ecc_code[2] = readb(&nand->nfecc + 2);
- debug("s3c24x0_nand_calculate_hwecc(%p,): 0x%02x 0x%02x 0x%02x\n",
- mtd , ecc_code[0], ecc_code[1], ecc_code[2]);
-
- return 0;
-}
-
-static int s3c24x0_nand_correct_data(struct mtd_info *mtd, u_char *dat,
- u_char *read_ecc, u_char *calc_ecc)
-{
- if (read_ecc[0] == calc_ecc[0] &&
- read_ecc[1] == calc_ecc[1] &&
- read_ecc[2] == calc_ecc[2])
- return 0;
-
- printf("s3c24x0_nand_correct_data: not implemented\n");
- return -EBADMSG;
+
+ switch (chipnr) {
+ case -1: /* 取消选中 */
+ nand->nfcont |= (1<<1);
+ break;
+ case 0: /* 选中 */
+ nand->nfcont &= ~(1<<1);
+ break;
+ default:
+ BUG();
+ break;
+ }
}
-#endif
int board_nand_init(struct nand_chip *nand)
{
@@ -129,18 +102,18 @@
twrph0 = 8;
twrph1 = 8;
#endif
-
- cfg = S3C2410_NFCONF_EN;
- cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
- cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
- cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
+ /* 初始化时序 */
+
+ 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);
+
/* initialize nand_chip data structure */
nand->IO_ADDR_R = (void *)&nand_reg->nfdata;
nand->IO_ADDR_W = (void *)&nand_reg->nfdata;
- nand->select_chip = NULL;
+ nand->select_chip = s3c2440_nand_select;
/* read_buf and write_buf are default */
/* read_byte and write_byte are default */
2、烧写u-boot.bin到Nor Flash上启动
book@ubuntu:~/u-boot-2016.11$ ./auto_run.sh
至此已经成功识别到Nand Flash为256MB