u-boot-2011.06移植

109：#define B5_Tacp                 0x0

110：#define B5_PMC                0x0

111：

112：#define B6_MT                  0x3

113：#define B6_Trcd                 0x1

114：#define B6_SCAN                     0x1

115：

116：#define B7_MT                  0x3

117：#define B7_Trcd                 0x1

118：#define B7_SCAN                     0x1

119：

120：

121：#define REFEN                  0x1

122：#define TREFMD               0x0

123：#define Trp                 0x1

124：#define Trc                 0x1

125：#define Tchr                0x2

126：#define REFCNT                1268

4．修改NandFlash相关内容。

尽管本次移植没有涉及到NandFlash，但为了能够编译成功，必须修改下面有关NandFlash的内容。

进入u-boot-2011.06目录，执行下列命令：

cp drivers/mtd/nand/s3c2410_nand.c drivers/mtd/nand/s3c2440_nand.c

打开drivers/mtd/nand/s3c2440_nand.c文件，把该文件内的所有有关“2410”的地方一律改为“2440”。

再打开drivers/mtd/nand/Makefile文件

第48行“COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o”改为

48：COBJS-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o

编译u-boot，把编译生成的新的u-boot.bin烧写到NorFlash中。开发板上电启动后，则在超级终端（或类似的软件）中显示的结果为：

U-Boot 2011.06 (Jul 30 2011 - 23:40:44)

DRAM: 64 MiB

Flash: 2 MiB

NAND: raise: Signal # 8 caught

raise: Signal # 8 caught

raise: Signal # 8 caught

raise: Signal # 8 caught

raise: Signal # 8 caught

raise: Signal # 8 caught

No NAND device found!!!

0 MiB

*** Warning - bad CRC, using defaultenvironment

In:   serial

Out:  serial

Err:  serial

Net:  CS8900-0

gq2440 #

从上述显示的内容可以看出本开发板的一些基本的信息，如DRAM为64M，NorFlash为2M，由于我没有设置NandFlash，因此系统没有检测到NandFlash，命令提示符也已经修改为“gq2440 # ”。

在提示符下输入flinfo，则会把NorFlash的更详细的信息显示出来：

Bank # 1: CFI conformant flash (16 x16)  Size: 2 MB in 35 Sectors

  AMDStandard command set, Manufacturer ID: 0x1C,Device ID: 0x2249

 Erase timeout: 16384 ms, write timeout: 1 ms

 Sector Start Addresses:

 00000000   RO   00004000  RO   00006000   RO  00008000   RO   00010000  RO

 00020000   RO   00030000  RO   00040000   RO  00050000   RO   00060000  RO

 00070000   RO   00080000        00090000        000A0000        000B0000

  000C0000        000D0000        000E0000        000F0000        00100000

 00110000        00120000        00130000        00140000        00150000

 00160000        00170000        00180000        00190000        001A0000

 001B0000        001C0000        001D0000        001E0000        001F0000

 3 支持NandFlash读写

我们把drivers/mtd/nand/s3c2410_nand.c文件复制为s3c2440_nand.c文件，并把该文件内的所有有关“2410”的地方一律改为“2440”。这么修改仅仅是能够让系统编译成功，并没有真正实现NandFlash的读写。在这里，我们就来介绍如何让u-boot支持NandFlash的读写。

由于s3c2410与s3c2440的NandFlash控制器不一样，因此s3c2440_nand.c文件并不能直接应用，需要进行适当的修改，而主要修改的内容就是s3c2440的相关寄存器。

首先重新定义要用到的寄存器，把原文中第27行至第37行之间的宏定义去掉，改为下面的形式：

#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

然后就是修改s3c2440_hwcontrol函数和board_nand_init函数，其他函数不变。

board_nand_init函数主要是用于对NandFlash的初始化，对它修改的内容是对寄存器NFCONF和寄存器NFCONT的修改，如下所示为修改后的board_nand_init函数，其中红色标注的地方为修改的地方：

int   board_nand_init(struct nand_chip *nand)

{

       u_int32_t cfg;

       u_int8_t tacls, twrph0, twrph1;

       struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();

       struct s3c2440_nand *nand_reg = s3c2440_get_base_nand();

       debugX(1,'board_nand_init()n');

       writel(readl(&clk_power->clkcon) |(1 << 4), &clk_power->clkcon);

#ifdefined(CONFIG_S3C24XX_CUSTOM_NAND_TIMING)

       tacls = CONFIG_S3C24XX_TACLS;

       twrph0 = CONFIG_S3C24XX_TWRPH0;

       twrph1 = CONFIG_S3C24XX_TWRPH1;

#else

       tacls = 2;

       twrph0 = 3;

       twrph1 = 1;

#endif

       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);

       nand->IO_ADDR_R = (void*)&nand_reg->nfdata;

       nand->IO_ADDR_W = (void*)&nand_reg->nfdata;

       nand->select_chip = NULL;

#ifdefCONFIG_NAND_SPL

       nand->read_buf = nand_read_buf;

#endif

       nand->cmd_ctrl = s3c2440_hwcontrol;

       nand->dev_ready = s3c2440_dev_ready;

#ifdefCONFIG_S3C2440_NAND_HWECC

       nand->ecc.hwctl = s3c2440_nand_enable_hwecc;

       nand->ecc.calculate = s3c2440_nand_calculate_ecc;

       nand->ecc.correct = s3c2440_nand_correct_data;

       nand->ecc.mode = NAND_ECC_HW;

       nand->ecc.size =CONFIG_SYS_NAND_ECCSIZE;

       nand->ecc.bytes =CONFIG_SYS_NAND_ECCBYTES;

#else

       nand->ecc.mode = NAND_ECC_SOFT;

#endif

#ifdef CONFIG_S3C2440_NAND_BBT

       nand->options = NAND_USE_FLASH_BBT;

#else

       nand->options = 0;

#endif

       debugX(1, 'end ofnand_initn');

       return 0;

}

最后修改s3c2440_hwcontrol函数，该函数是用于对NandFlash的写命令和写地址操作：

static void s3c2440_hwcontrol(structmtd_info *mtd, int cmd, unsigned int ctrl)

{

       struct nand_chip *chip =mtd->priv;

       struct s3c2440_nand *nand = s3c2440_get_base_nand();

       debugX(1,'hwcontrol(): 0xx 0xxn', cmd, ctrl);

       if (ctrl &NAND_CTRL_CHANGE) {

              ulong IO_ADDR_W = (ulong)nand;

              if (!(ctrl &NAND_CLE))