AT91sam9260ek修改nandflash大小调试笔记

原开发板是256M的NANDFLASH，目的是想用一个64M的nandflash,并且从nandflash启动。

?主要是对bootstraps修改，修改地方如下：（以百特光盘自带的AT91Bootstrap1.2为例）

?1：AT91Bootstrap1.2/include/nand_ids.h中的增加两行

{0xecf1,0x400,0x20000,0x800,0x40,0x0,"Samsung K9F1G08U0M 128Mb/0"},

?????? {0xec76,0x1000,0x4000,0x200,0x10,"Samsung K9F12808u0b 64Mb/0"},

即变成：

/* Supported NandFlash devices */

static struct SNandInitInfo NandFlash_InitInfo[] = {

?????? {0xecda,"Samsung K9F2G08U0M 256Mb/0"},

{0xecf1,

?????? {0xec76,

????? {0xecaa,"Samsung K9F2G08U0A 256Mb/0"},

?????? {0x2cca,0x1,"Micron MT29F2G16AAB 256Mb/0"},????

?????? {0,}

};

2即增加了支持三星的128M，64M的两款nandfalsh。

到此128M的nandflash可完全支持了。因为128M和256M的nandflash读写调用函数是一个。但要注意烧写128M的时候还要对SAM-BA2.5 里的lib/AT91SAM9260-ek/NANDFLASH.tcl中增加支持128M的nandflash，要不SAM-BA2.5无法发现nandflash，具体修改为（红色部分为后加）

switch $devID {

??? "ca" {set nf(nandNbBlocks)???? ????0x800

??????? set nf(nandBlockSize)??????? 0x20000

??????? set nf(nandSectorSize)???????? 0x800

??????? set nf(nandSpareSize)?????????? 0x40

??????? set nf(nandBusWidth)?????????????? 1

??????? set nf(monitorName)??????????????? "SAM-BA-nand.bin"

???? ???puts "-I- NandFlash $manName 16 bits 256MB"}

??? "f1" {set nf(nandNbBlocks)???????? 0x400

??????? set nf(nandBlockSize)??????? 0x20000

??????? set nf(nandSectorSize)???????? 0x800

??????? set nf(nandSpareSize)?????????? 0x40

??????? set nf(nandBusWidth)?????????????? 0

??????? set nf(monitorName)??????????????? "SAM-BA-nand.bin"

??????? puts "-I- NandFlash $manName 8 bits 128MB"}

???????

??? "da" {set nf(nandNbBlocks)???????? 0x800

??????? set nf(nandBlockSize)??????? 0x20000

??????? set nf(nandSectorSize)???????? 0x800

??????? set nf(nandSpareSize)?????????? 0x40

??????? set nf(nandBusWidth)?????????????? 0

??????? set nf(monitorName)??????????????? "SAM-BA-nand.bin"

??????? puts "-I- NandFlash $manName 8 bits 256MB"}

??? "76" {set nf(nandNbBlocks)???? ???0x1000

??????? set nf(nandBlockSize)???????? 0x4000

??????? set nf(nandSectorSize)???????? 0x200

??????? set nf(nandSpareSize)?????????? 0x10

??????? set nf(nandBusWidth)?????????????? 0

??????? set nf(monitorName)??????????????? "SAM-BA-nand-small.bin"

??????? puts "-I- NandFlash $manName 8 bits 64MB"}

??? default {puts stderr "-E- NandFlash not supported..."

??????? return}

}

3而这样64M的nandflash的修改还没有完成，其实从以上的"SAM-BA-nand.bin"和 "SAM-BA-nand-small.bin"也可以看出，512M，256M，128M的对FLASH操作是调用同一BIN文件，而64M以下的就不同。同理在Bootstraps 里的对大容量，小容量的nandflash读写也都不一样的。可从AT91Bootstrap1.2/driver/nandflash.c中看出。

?#ifdef NANDFLASH_SMALL_BLOCKS

/*------------------------------------------------------------------------------*/

/* /fn??? AT91F_NandReadSector??????????????????????????????????????????????? */

/* /brief Read a Sector??????????????????????????????????????????????????? */

/*------------------------------------------------------------------------------*/

BOOL AT91F_NandReadSector(PSNandInfo pNandInfo,unsigned int uSectorAddr,char *pOutBuffer,unsigned int fZone)

。。。。。。。。。。

。。。。。。。。。。

。。。。。。。。。。

#else /* NANDFLASH_LARGE_BLOCKS */

?

/*------------------------------------------------------------------------------*/

/* /fn??? AT91F_NandReadSector??????????????????????????????????????????????? */

/* /brief Read a Sector??????????????????????????????????????????????????? */

/*------------------------------------------------------------------------------*/

static BOOL AT91F_NandReadSector(PSNandInfo pNandInfo,unsigned int fZone)

?

这两个相同的函数就是分别对64M （NANDFLASH_SMALL_BLOCKS）和256M（NANDFLASH_LARGE_BLOCKS）的NANDFLASH操作的函数。调用哪个函数就看你对NANDFLASH_SMALL_BLOCKS是否定义了。因此我们在头文件AT91Bootstrap1.2/board/at91sam9260ek/nandflash/at91sam9260ek.h中将

#undef??? NANDFLASH_SMALL_BLOCKS /* NANDFLASH_LARGE_BLOCKS used instead */

语句改称#define??? NANDFLASH_SMALL_BLOCKS /* NANDFLASH_LARGE_BLOCKS used instead */即此定义成小容量模式。

到此bootstraps的修改已完成。

注：1如果此时编译后的bootstraps比较大，而烧写进FLASH后打印不正常，可考虑去掉打印信息，即在AT91Bootstrap1.2/board/at91sam9260ek/nandflash/at91sam9260ek.h中 将#undef CFG_DEBUG写入，屏蔽//#define CFG_DEBUG。

2 {0xecf1,

0xecf1：ID

0x400：Nbblocks

0x20000：Blocksize

0x800：SectorSize

0x40：SpareSize

0x0：Buswidth