移植u-boot

1.因为u-boot已经对SMDK2410支持了，所以这里只是简单修改
2.这里移植u-boot-1.1.6.tar.bz2
3.ftp://ftp.denx.de/pub/u-boot/从这个网站下载源码
4.上传到自己的linux服务器中
5.修改根目录下的mkconfig的权限为可执行
6.在u-boot-1.1.6\board目录下创建自己的板子文件夹
1.这里的文件夹为my2440
2.并把smdk2410文件夹中的文件全部复制过来
3.修改u-boot-1.1.6\board\my2440下的smdk2410.c文件为my2440.c
4.修改u-boot-1.1.6\board\my2440下的Makefile文件中的
COBJS := smdk2410.o flash.o
SOBJS := lowlevel_init.o
修改为
COBJS := my2440.o flash.o
SOBJS := lowlevel_init.o
7.增加自己板子对应的头文件
1.进入u-boot-1.1.6\include\configs文件夹
2.创建对应头文件为，这里复制smdk2410.h并更名为my2440.h
8.进入u-boot根目录u-boot-1.1.6\
1.执行 make my2440_config
2.执行 make
3.应该会编译成功生成 u-boot.bin文件
9.开始修改代码，支持S3C2440,这里主要是时钟的不同,主要也是修改时钟
10.进入u-boot-1.1.6\board\my2440\my2440.c文件
11.增加宏定义
/* write by shi xiong tao */
#define S3C2440_MPLL_400MHZ ((0X5C<<12)|(0X01<<4)|(0X01))
#define S3C2440_UPLL_48MHZ ((0X38<<12)|(0X02<<4)|(0X02))
#define S3C2440_CLKDIV (0X05)
/* write by shi xiong tao */
12.在board_init函数中修改,修改为
/* write by shi xiong tao */
#define S3C2440_MPLL_400MHZ ((0X5C<<12)|(0X01<<4)|(0X01))
#define S3C2440_UPLL_48MHZ ((0X38<<12)|(0X02<<4)|(0X02))
#define S3C2440_CLKDIV (0X05)
/* write by shi xiong tao */

int board_init (void){    S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();    S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();    /* set up the I/O ports */    gpio->GPACON = 0x007FFFFF;    gpio->GPBCON = 0x00044555;    gpio->GPBUP = 0x000007FF;    gpio->GPCCON = 0xAAAAAAAA;    gpio->GPCUP = 0x0000FFFF;    gpio->GPDCON = 0xAAAAAAAA;    gpio->GPDUP = 0x0000FFFF;    gpio->GPECON = 0xAAAAAAAA;    gpio->GPEUP = 0x0000FFFF;    gpio->GPFCON = 0x000055AA;    gpio->GPFUP = 0x000000FF;    gpio->GPGCON = 0xFF95FFBA;    gpio->GPGUP = 0x0000FFFF;    gpio->GPHCON = 0x002AFAAA;    gpio->GPHUP = 0x000007FF;    clk_power->CLKDIVN = S3C2440_CLKDIV;    __asm__(        "mrc    p15, 0, r1, c1, c0, 0\n"        "orr    r1, r1, #0xc0000000\n"        "mcr    p15, 0, r1, c1, c0, 0\n"        :::"r1"    );    clk_power->LOCKTIME = 0XFFFFFF;    clk_power->MPLLCON = S3C2440_MPLL_400MHZ;    delay(4000);    clk_power->UPLLCON = S3C2440_UPLL_48MHZ;    delay(8000);    /* arch number of SMDK2410-Board */    //we jump it ,and will change it later    //这里的机器类型暂时还没有修改    //不知道在哪里定义的，不知道该定义成什么    gd->bd->bi_arch_number = MACH_TYPE_SMDK2410;    /* adress of boot parameters */    gd->bd->bi_boot_params = 0x30000100;    icache_enable();    dcache_enable();    return 0;}

13.上面是修改了系统时钟
14.下面修改获取系统时钟的函数
15.进入u-boot-1.1.6\cpu\arm920t\s3c24x0\speed.c文件
16.增加 DECLARE_GLOBAL_DATA_PTR; 这样就可以在这个文件中读取其他的文件中的变量
17.修改 get_PLLCLK 函数 为
static ulong get_PLLCLK(int pllreg)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
ulong r, m, p, s;

    if (pllreg == MPLL)        r = clk_power->MPLLCON;    else if (pllreg == UPLL)        r = clk_power->UPLLCON;    else        hang();    m = ((r & 0xFF000) >> 12) + 8;    p = ((r & 0x003F0) >> 4) + 2;    s = r & 0x3;    /* write by shi xiong tao */    return(((CONFIG_SYS_CLK_FREQ * m) * 2) / (p << s));    /* write by shi xiong tao */}

18.增加宏定义
#define S3C2440_CLKDIVN_PDIVN (1<<0)
#define S3C2400_CLKDIVN_HDIVN_MASK (3<<1)
#define S3C2400_CLKDIVN_HDIVN_1 (0<<1)
#define S3C2400_CLKDIVN_HDIVN_2 (1<<1)
#define S3C2400_CLKDIVN_HDIVN_4_8 (2<<1)
#define S3C2400_CLKDIVN_HDIVN_3_6 (3<<1)

#define S3C2400_CAMDIVN_CAMCLK_MASK     (0XF<<0)#define S3C2400_CAMDIVN_CAMCLK_SEL      (1<<4)#define S3C2400_CAMDIVN_HCLK3_HALF      (1<<8)#defien S3C2400_CAMDIVN_HCLK4_HALF      (1<<9)#define S3C2400_CAMDIVN_DVSEN           (1<<12)

19.修改 get_HCLK 函数
ulong get_HCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();

    unsigned long clkdiv;    unsigned long camdiv;    int hdiv;    /* this code is for s3c2410 so we do not need it */    //return((clk_power->CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK());    clkdiv = clk_power->CLKDIVN;    camdiv = clk_power->CAMDIVN;    //calculate     switch(clkdiv & S3C2400_CLKDIVN_HDIVN_MASK)    {        case S3C2400_CLKDIVN_HDIVN_1:            hdiv = 1;            break;        case S3C2400_CLKDIVN_HDIVN_2:            hdiv = 2;            break;        case S3C2400_CLKDIVN_HDIVN_4_8:            hdiv = (camdiv & S3C2400_CAMDIVN_HCLK4_HALF) ? 8 : 4;            break;        case S3C2400_CLKDIVN_HDIVN_3_6:            hdiv = (camdiv & S3C2400_CAMDIVN_HCLK3_HALF) ? 6 : 3;            break;    }    return get_FCLK() / hdiv;}

20.修改 get_PCLK 函数
/* return PCLK frequency */
ulong get_PCLK(void)
{
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();

unsigned long clkdiv;unsigned long camdiv;int hdiv;//this code is for s3c2410 so we do not need it//return((clk_power->CLKDIVN & 0x1) ? get_HCLK()/2 : get_HCLK());clkdiv = clk_power->CLKDIVN;camdiv = clk_power->CAMDIVN;//calculateswitch(clkdiv & S3C2400_CLKDIVN_HDIVN_MASK){    case S3C2400_CLKDIVN_HDIVN_1:        hdiv = 1;        break;    case S3C2400_CLKDIVN_HDIVN_2:        hdiv = 2;        break;    case S3C2400_CLKDIVN_HDIVN_4_8:        hdiv = (camdiv & S3C2400_CAMDIVN_HCLK4_HALF) ? 8 : 4;        break;    case S3C2400_CLKDIVN_HDIVN_3_6:        hdiv = (camdiv & S3C2400_CAMDIVN_HCLK3_HALF) ? 6 : 3;        break;}return get_FCLK() / hdiv / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);

}
21.进入u-boot根目录u-boot-1.1.6\
1.执行 make my2440_config
2.执行 make
3.应该会编译成功生成 u-boot.bin文件
22.下载u-boot.bin文件到开发板的norfalsh中