u-boot移植2：支持 nandflash 的读写
u-boot 版本：2016.03
用的交叉编译工具：arm-none-linux-gnueabi-
操作的文件：
drivers/mtd/nand/s3c2440_nand.c
1. 修改 s3c2440 的 nandflash 的控制器：
@@ -11,17 +11,17 @@
#include <asm/arch/s3c24x0_cpu.h>
#include <asm/io.h>
-#define S3C2440_NFCONF_EN (1<<15)
-#define S3C2440_NFCONF_512BYTE (1<<14)
-#define S3C2440_NFCONF_4STEP (1<<13)
-#define S3C2440_NFCONF_INITECC (1<<12)
-#define S3C2440_NFCONF_nFCE (1<<11)
-#define S3C2440_NFCONF_TACLS(x) ((x)<<8)
-#define S3C2440_NFCONF_TWRPH0(x) ((x)<<4)
-#define S3C2440_NFCONF_TWRPH1(x) ((x)<<0)
-
-#define S3C2440_ADDR_NALE 4
-#define S3C2440_ADDR_NCLE 8
+#define S3C2440_NFCONT_SECCL (1<<6)
+#define S3C2440_NFCONT_MECCL (1<<5)
+#define S3C2440_NFCONT_INITECC (1<<4)
+#define S3C2440_NFCONT_nCE (1<<1)
+#define S3C2440_NFCONT_MODE (1<<0)
+#define S3C2440_NFCONF_TACLS(x) ((x)<<12)
+#define S3C2440_NFCONF_TWRPH0(x) ((x)<<8)
+#define S3C2440_NFCONF_TWRPH1(x) ((x)<<4)
+
+#define S3C2440_ADDR_NALE 0x08
+#define S3C2440_ADDR_NCLE 0x0c
#ifdef CONFIG_NAND_SPL
2. 修改 s3c24x0_hwcontrol()：
说明：
- 该函数是用于对 nandflash 的写命令和写地址操作
- 添加 if(cmd == NAND_CMD_NONE)判断语句。如果不加这个判断语句，向NandFlash内写数据是写不进去的，因为在写完命令和地址后，一定还要把IO端口的地址重新设置为寄存器NFDATA。
- 系统没有定义CONFIG_S3C2410_NAND_HWECC，因此我们暂时先不对s3c2440_nand_enable_hwecc函数、s3c2440_nand_calculate_ecc函数和s3c2440_nand_correct_data函数进行修改。
@@ -53,13 +53,16 @@ static void s3c24x0_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
if (!(ctrl & NAND_ALE))
IO_ADDR_W |= S3C2440_ADDR_NALE;
- chip->IO_ADDR_W = (void *)IO_ADDR_W;
+ if (cmd == NAND_CMD_NONE)
+ IO_ADDR_W = (ulong)&nand->nfdata;
+
+ chip->IO_ADDR_W = (void *)IO_ADDR_W;
if (ctrl & NAND_NCE)
- writel(readl(&nand->nfconf) & ~S3C2440_NFCONF_nFCE,
+ writel(readl(&nand->nfconf) & ~S3C2440_NFCONT_nCE,
&nand->nfconf);
else
- writel(readl(&nand->nfconf) | S3C2440_NFCONF_nFCE,
+ writel(readl(&nand->nfconf) | S3C2440_NFCONT_nCE,
&nand->nfconf);
}
3. 和 board_nand_init() 函数：
说明：
- 此函数是对寄存器 NFCONF 和 NFCONT 的修改
@@ -125,17 +128,21 @@ int board_nand_init(struct nand_chip *nand)
twrph0 = CONFIG_S3C24XX_TWRPH0;
twrph1 = CONFIG_S3C24XX_TWRPH1;
#else
- tacls = 4;
- twrph0 = 8;
- twrph1 = 8;
+ tacls = 2;
+ twrph0 = 3;
+ twrph1 = 1;
#endif
- cfg = S3C2440_NFCONF_EN;
- cfg |= S3C2440_NFCONF_TACLS(tacls - 1);
+ cfg = S3C2440_NFCONF_TACLS(tacls - 1);
cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);
cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);
writel(cfg, &nand_reg->nfconf);
+ cfg = S3C2440_NFCONT_SECCL;
+ cfg |= S3C2440_NFCONT_MECCL;
+ cfg |= S3C2440_NFCONT_MODE;
+ writel(cfg, &nand_reg->nfcont);
+
/* initialize nand_chip data structure */
nand->IO_ADDR_R = (void *)&nand_reg->nfdata;
nand->IO_ADDR_W = (void *)&nand_reg->nfdata;
4. 验证：
思路：
- 选中device 0
- 擦除 nandflash 的从 0x100000 地址开始的 0x300000 大小的区域
- 强 sdram 的从 0 地址开始的0x300000 大小的内容写到nandflash中从 0x100000 开始的地址上去
- 读取 nandflash 从 0x100000 开始的大小 0x300000 的内容到 sdram 的 0x30004000位置上
- 读取 sdram 上的 从0 开始的默认大小的数据 和 sdram 上的 从 0x30004000 开始的默认大小的数据，并且以字节方式显示，看看他们是不是一样，如果一样，说明读和写都是没有问题的
U-Boot 2016.03-00001-g79e6686-dirty (May 05 2016 - 14:40:05 +0800)
CPUID: 32440001
FCLK: 400 MHz
HCLK: 100 MHz
PCLK: 50 MHz
DRAM: 64 MiB
WARNING: Caches not enabled
Flash: 2 MiB
NAND: 256 MiB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: CS8900-0
Error: CS8900-0 address not set.
LIP2440 # nand info
Device 0: nand0, sector size 128 KiB
Page size 2048 b
OOB size 64 b
Erase size 131072 b
subpagesize 512 b
options 0x 1008
bbt options 0x 8000
LIP2440 #
nand device 0
LIP2440 #
nand erase 100000 300000
NAND erase: device 0 offset 0x100000, size 0x300000
Erasing at 0x3e0000 -- 100% complete.
OK
LIP2440 #
nand write 0 100000 300000
NAND write: device 0 offset 0x100000, size 0x300000
3145728 bytes written: OK
LIP2440 #
nand read 30004000 100000 300000
NAND read: device 0 offset 0x100000, size 0x300000
3145728 bytes read: OK
LIP2440 #
md.b 0
00000000: be 00 00 ea 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 ................
00000010: 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 ................
00000020: 60 00 00 00 c0 00 00 00 20 01 00 00 80 01 00 00 `....... .......
00000030: e0 01 00 00 40 02 00 00 a0 02 00 00 ef be ad de ....@...........
LIP2440 #
md.b 30004000
30004000: be 00 00 ea 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 ................
30004010: 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 ................
30004020: 60 00 00 00 c0 00 00 00 20 01 00 00 80 01 00 00 `....... .......
30004030: e0 01 00 00 40 02 00 00 a0 02 00 00 ef be ad de ....@...........
LIP2440 #