1、 新增nand flash 移植
mtd為linux下的儲存架構，mtd封裝了對儲存器操作的統一介面函式，方便linux呼叫
檢視lib_arm/boart.c檔案，可以看到nand_init()函式在drivers/mtd/nand/nand.c中定義
#if defined(config_cmd_nand)
puts ("nand: ");
nand_init(); /* go init the nand */
#endif
用sourceinsight檢視，發現
a) 在include/s3c24x0.h中新增
typedef struct s3c2440_nand;
在include/s3c2410.h中新增
#define s3c2440_nand_base 0x4e000000
static inline s3c2440_nand * s3c2440_getbase_nand(void)
return (s3c2440_nand * const)s3c2440_nand_base;
b) include/configs/mini2440.h
修改1：新增對nand的支援，新增
#define config_cmd_nand
#define config_max_nand_device 1
#define config_sys_nand_base 0x4e000000
#define config_mtd_device選項可以不加，只是對nand info命令有影響
c) drivers/mtd/nand/s3c2410_nand.c
修改1：注釋掉原始檔開始的所有暫存器定義，新增
#define nfconf __regi(nf_base + 0x0)
#define nfcont __regi(nf_base + 0x4)
#define nfcmd __regb(nf_base + 0x8)
#define nfaddr __regb(nf_base + 0xc)
#define nfdata __regb(nf_base + 0x10)
#define nfstat __regb(nf_base + 0x20)
#define nfecc0 __regb(nf_base + 0x14)
#define nfecc1 __regb(nf_base + 0x18)
#define nfsecc __regb(nf_base + 0x1c)
#define s3c2440_nfcont_en (1<<0)
#define s3c2440_nfcont_nfce (0<<1)
#define s3c2440_nfcont_initecc (1<<4)
#define s3c2440_nfconf_tacls(x) ((x)<<12)
#define s3c2440_nfconf_twrph0(x) ((x)<<8)
#define s3c2440_nfconf_twrph1(x) ((x)<<4)
#define s3c2440_nfcont_nce (1<<1)
#define s3c2440_addr_nale 0x0c
#define s3c2440_addr_ncle 0x08
修改2：修改函式s3c2410_hwcontrol如下
static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
struct nand_chip *chip = mtd->priv;//可加可不加
ulong io_addr_w = nf_base;
debugn("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);
if (ctrl & nand_ctrl_change) {
io_addr_w = nf_base;
if (!(ctrl & nand_cle))
io_addr_w |= s3c2440_addr_nale;
if (!(ctrl & nand_ale))
io_addr_w |= s3c2440_addr_ncle;
if (ctrl & nand_nce)
nfcont &= ~s3c2440_nfcont_nce;
else
nfcont |= s3c2440_nfcont_nce;
if (cmd != nand_cmd_none)
writeb(cmd, (void *)io_addr_w);
個人認為全域性變數io_addr_w可以換成其他變數名
修改3：board_nand_init函式，首先設定nfconf,nfcont暫存器的值，並確定nand讀寫的nfdata暫存器，
twrph0 =5; twrph1 = 3; tacls = 0;
cfg = s3c2440_nfconf_tacls(tacls - 1);
cfg |= s3c2440_nfconf_twrph0(twrph0 - 1);
cfg |= s3c2440_nfconf_twrph1(twrph1 - 1);
nfconf = cfg;
cfg = s3c2440_nfcont_en;
cfg |= s3c2440_nfcont_nfce;
cfg |= s3c2440_nfcont_initecc;
nfcont = cfg;
設定mtd_info中io_addr_w和io_addr_r值，
nand->io_addr_r = nand->io_addr_w = (void *)0x4e000010;
並設定命令解析函式和等待空閒函式，正常結束返回0值。
nand->cmd_ctrl = s3c2410_hwcontrol;
nand->dev_ready = s3c2410_dev_ready;
修改4 ：進入頂層目錄編譯工程,出現undefined reference to `board_nand_init',檢視drivers/mtd/nand/makefile檔案,看到
cobjs-$(config_nand_ndfc) += ndfc.o
cobjs-$(config_nand_nomadik) += nomadik.o
cobjs-$(config_nand_s3c2410) += s3c2410_nand.o
cobjs-$(config_nand_s3c64xx) += s3c64xx.o
修改5:修改nandflash讀寫時序,drivers/mtd/nand/s3c2410_nand.c
ulong nand_addr = nf_base;
static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
if (ctrl & nand_ctrl_change) {
nand_addr = nf_base;
if (!(ctrl & nand_cle))
nand_addr |= s3c2440_addr_nale;
if (!(ctrl & nand_ale))
nand_addr |= s3c2440_addr_ncle;
if (ctrl & nand_nce)
nfcont &=~s3c2440_nfcont_nce;
else
nfcont |=s3c2440_nfcont_nce;
if (cmd != nand_cmd_none)
writeb(cmd, (void *)nand_addr);
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