u-boot移植2：支持 nandflash 的读写

发布时间：2020-12-15 20:04:51 所属栏目：百科来源：网络整理

导读：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_N

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.

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 #?

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