uboot移植记录-strongerII-ChinaUnix博客

一、在U-Boot中建立自己的开发板类型，并测试编译。
我为开发板取名叫: tekkaman2410
0 在工作目录下解压U－Boot。
$tar zxvf u-boot.git.tar.gz

1 进入U-Boot目录，修改Makefile
$cd u-boot.git/
$vi Makefile
#为tekkaman2410建立编译项

smdk2410_config :       unconfig
        @$(MKCONFIG) $(@:_config=) arm arm920t smdk2410 NULL s3c24x0

tekkaman2410_config    :    unconfig
        @$(MKCONFIG) $(@:_config=) arm arm920t tekkaman2410 tekkaman s3c24x0
各项的意思如下:
arm: CPU的架构(ARCH)
arm920t: CPU的类型(CPU)，其对应于cpu/arm920t子目录。
tekkaman2410: 开发板的型号(BOARD)，对应于board/tekkaman/tekkaman2410目录。
tekkaman: 开发者/或经销商(vender)。
s3c24x0: 片上系统(SOC)。

同时在“ifndef CROSS_COMPILE ”之前加上自己交叉编译器的路径，比如我使用crosstool-0.43制作的基于2.6.22.2内核和gcc-4.1.0-glibc-2.3.2的ARM9TDMI交叉编译器，则：

CROSS_COMPILE=/home/tekkaman/working/crosstool-gcc410-k26222/gcc-4.1.0-glibc-2.3.2/arm-9tdmi-linux-gnu/bin/arm-9tdmi-linux-gnu-

2 在/board子目录中建立自己的开发板tekkaman2410目录

由于我在上一步板子的开发者/或经销商(vender)中填了 tekkaman ，所以开发板tekkaman2410目录一定要建在/board子目录中的tekkaman目录下，否则编译会出错。

$cd board
$mkdir tekkaman tekkaman/tekkaman2410
$cp -arf smdk2410/*   tekkaman/tekkaman2410/
$cd tekkaman/tekkaman2410
$mv smdk2410.c tekkaman2410.c

   还要记得修改自己的开发板tekkaman2410目录下的Makefile文件，不然编译时会出错：
COBJS    := tekkaman2410.o flash.o
$vi Makefile

3 在include/configs/中建立配置头文件
$cd ../../..
$cp include/configs/smdk2410.h include/configs/tekkaman2410.h

4 测试编译能否成功
$make tekkaman2410_config
Configuring for tekkaman2410 board...
(如果出现：
$ make tekkaman2410_config
Makefile:1927: *** 遗漏分隔符。停止。
请在U－boot的根目录下的Makefile的
        @$(MKCONFIG) $(@:_config=) arm arm920t tekkaman2410 tekkaman)
前加上“Tab”键）
$make

    我到这一步测试交叉编译成功！！

二、修改U－Boot中的文件，以匹配博创的2410－S实验箱(网卡驱动有问题，以后有空一定解决)。
1 修改/cpu/arm920t/start.S

(1)修改中断禁止部分

# if defined(CONFIG_S3C2410)
    ldr    r1, =0x7ff   //根据2410芯片手册，INTSUBMSK有11位可用，
                       //vivi也是0x7ff，不知为什么U－Boot一直没改过来。
    ldr    r0, =INTSUBMSK
    str    r1, [r0]
# endif

(2)修改时钟设置（可以不修改，因为后面的board_init函数也会将时钟设为202.8MHz）

    /* FCLK:HCLK:PCLK = 1:2:4 */
    /* default FCLK is 120 MHz ! */
    ldr    r0, =CLKDIVN
    mov    r1, #3
    str    r1, [r0]

    mrc    p15, 0, r1, c1, c0, 0        /*read ctrl register   tekkaman*/
    orr    r1, r1, #0xc0000000         /*Asynchronous tekkaman*/
    mcr    p15, 0, r1, c1, c0, 0    /*write ctrl register tekkaman*/

    /*now, CPU clock is 202.8 Mhz   tekkaman*/
    mov    r1, #CLK_CTL_BASE    /* tekkaman*/
    mov    r2, #MDIV_200                   /* mpll_200mhz    tekkaman*/
    add    r2, r2, #PSDIV_200             /* mpll_200mhz    tekkaman*/
    str    r2, [r1, #0x04]               /* MPLLCON tekkaman */

#endif    /* CONFIG_S3C2400 || CONFIG_S3C2410 */

    红色部分是我添加的，因为 U－Boot 使用的是 /* default FCLK is 120 MHz ! */
    我利用博创提供的vivi的代码，将其设为202.8MHz 并在前面加上：

#elif defined(CONFIG_S3C2410)
# define pWTCON        0x53000000
# define INTMSK        0x4A000008    /* Interupt-Controller base addresses */
# define INTSUBMSK    0x4A00001C
# define CLKDIVN    0x4C000014    /* clock divisor register */
#define CLK_CTL_BASE        0x4C000000 /* tekkaman */
#define MDIV_200        0xa1 << 12   /* tekkaman */
#define PSDIV_200        0x31       /* tekkaman */

(3)将从Flash启动改成从NAND Flash启动。
将以下U－Boot的重定向语句段：

#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate:                /* relocate U-Boot to RAM        */
    adr    r0, _start        /* r0 <- current position of code   */
    ldr    r1, _TEXT_BASE        /* test if we run from flash or RAM */
    cmp     r0, r1                  /* don't reloc during debug         */
    beq     stack_setup

    ldr    r2, _armboot_start
    ldr    r3, _bss_start
    sub    r2, r3, r2        /* r2 <- size of armboot            */
    add    r2, r0, r2        /* r2 <- source end address         */

copy_loop:
    ldmia    r0!, {r3-r10}        /* copy from source address [r0]    */
    stmia    r1!, {r3-r10}        /* copy to   target address [r1]    */
    cmp    r0, r2            /* until source end addreee [r2]    */
    ble    copy_loop
#endif    /* CONFIG_SKIP_RELOCATE_UBOOT */

替换成：

#ifdef CONFIG_S3C2410_NAND_BOOT   @tekkaman@@@@@@@@@@@@@@@@SSSSSSSSSSSSS
@ reset NAND
mov r1, #NAND_CTL_BASE
ldr   r2, =0xf830           @ initial value
str   r2, [r1, #oNFCONF]
ldr   r2, [r1, #oNFCONF]
bic r2, r2, #0x800              @ enable chip
str   r2, [r1, #oNFCONF]
mov r2, #0xff         @ RESET command
strb r2, [r1, #oNFCMD]

mov r3, #0                   @ wait
nand1:
add r3, r3, #0x1
cmp r3, #0xa
blt   nand1

nand2:
ldr   r2, [r1, #oNFSTAT]      @ wait ready
tst    r2, #0x1
beq nand2

ldr   r2, [r1, #oNFCONF]
orr r2, r2, #0x800              @ disable chip
str   r2, [r1, #oNFCONF]

@ get read to call C functions (for nand_read())
ldr   sp, DW_STACK_START       @ setup stack pointer
mov fp, #0                    @ no previous frame, so fp=0

@ copy U-Boot to RAM
ldr   r0, =TEXT_BASE
mov     r1, #0x0
mov r2, #0x20000
bl    nand_read_ll
tst    r0, #0x0
beq ok_nand_read

bad_nand_read:
loop2:    b     loop2          @ infinite loop

ok_nand_read:
@ verify
mov r0, #0
ldr   r1, =TEXT_BASE
mov r2, #0x400     @ 4 bytes * 1024 = 4K-bytes
go_next:
ldr   r3, [r0], #4
ldr   r4, [r1], #4
teq   r3, r4
bne notmatch
subs r2, r2, #4
beq stack_setup
bne go_next

notmatch:
loop3:     b     loop3         @ infinite loop

#endif @ CONFIG_S3C2410_NAND_BOOT @tekkaman@@@@@@@@@@@@@@@@@@EEEEEEEEE

在 “ _start_armboot:    .word start_armboot ” 后加入：
   .align     2
DW_STACK_START: .word STACK_BASE+STACK_SIZE-4

附：顺便提一下，在start.S文件的注释部分有个小错误（红色部分：原来是2）：
cpu_init_crit:
    ......
    /*
    * disable MMU stuff and caches
    */
    mrc    p15, 0, r0, c1, c0, 0
    bic    r0, r0, #0x00002300    @ clear bits 13, 9:8 (--V- --RS)
    bic    r0, r0, #0x00000087    @ clear bits 7, 2:0 (B--- -CAM)
    orr    r0, r0, #0x00000002    @ set bit 1 (A) Align
    ......

2 在board/tekkaman/tekkaman2410加入NAND Flash读函数，建立nand_read.c文件，加入如下内容(copy from vivi)：

#include

#define __REGb(x) (*(volatile unsigned char *)(x))
#define __REGi(x) (*(volatile unsigned int *)(x))
#define NF_BASE  0x4e000000
#define NFCONF  __REGi(NF_BASE + 0x0)
#define NFCMD  __REGb(NF_BASE + 0x4)
#define NFADDR  __REGb(NF_BASE + 0x8)
#define NFDATA  __REGb(NF_BASE + 0xc)
#define NFSTAT  __REGb(NF_BASE + 0x10)

#define BUSY 1

inline void wait_idle(void) {
int i;

while(!(NFSTAT & BUSY))
for(i=0; i<10; i++);
}

/* low level nand read function */
int
nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
{
int i, j;

    if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {
        return -1; /* invalid alignment */
    }

    /* chip Enable */
    NFCONF &= ~0x800;
    for(i=0; i<10; i++);

    for(i=start_addr; i < (start_addr + size);) {
      /* READ0 */
      NFCMD = 0;

      /* Write Address */
      NFADDR = i & 0xff;
      NFADDR = (i >> 9) & 0xff;
      NFADDR = (i >> 17) & 0xff;
      NFADDR = (i >> 25) & 0xff;

wait_idle();

      for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {
*buf = (NFDATA & 0xff);
buf++;
      }
    }

/* chip Disable */
NFCONF |= 0x800; /* chip disable */

return 0;
}

3 修改board/tekkaman/tekkaman2410/Makefile文件
......
OBJS := tekkaman2410.o nand_read.o
......
4 修改include/configs/tekkaman2410.h文件，添加如下内容：
......
/*
* Nandflash Boot
*/
#define CONFIG_S3C2410_NAND_BOOT 1
#define STACK_BASE    0x33f00000
#define STACK_SIZE    0x8000
//#define UBOOT_RAM_BASE    0x33f80000
/* NAND Flash Controller */
#define NAND_CTL_BASE            0x4E000000
#define bINT_CTL(Nb)        __REG(INT_CTL_BASE + (Nb))
/* Offset */
#define oNFCONF               0x00
#define oNFCMD                0x04
#define oNFADDR               0x08
#define oNFDATA               0x0c
#define oNFSTAT               0x10
#define oNFECC                0x14
#endif    /* __CONFIG_H */
5 修改board/tekkaman/tekkaman2410/lowlevel_init.S文件
    依照开发箱的内存区的配置情况, 修改board/tekkaman/tekkaman2410/lowlevel_init.S文件，我利用博创提供的vivi源码里的信息做了如下更改:
......
#define B1_BWSCON        (DW16)    /*@tekkaman*/
#define B2_BWSCON        (DW16)
#define B3_BWSCON        (DW16)    /*@tekkaman*/
#define B4_BWSCON        (DW16)
#define B5_BWSCON        (DW16)
#define B6_BWSCON        (DW32)
#define B7_BWSCON        (DW32)
......
#define B3_Tacs             0x0    /* 0clk */
#define B3_Tcos             0x0    /* 0clk @tekkaman*/
#define B3_Tacc             0x7    /* 14clk */
#define B3_Tcoh             0x0    /* 0clk @tekkaman*/
#define B3_Tah              0x0    /* 0clk */
#define B3_Tacp             0x0    /*@tekkaman*/
#define B3_PMC              0x0    /* normal */
......
注：之所以Bank3的改动较大，是因为smdk2410的网卡是在Bank3，而博创的2410－S是在Bank2。至于AX88796的驱动，我现在还没搞定，以后搞定了一定上传。有那位大侠搞定了一定通知一声，小的不甚感激！
......
    .word ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN))
.word ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)
    .word 0xb2    /*@tekkaman*/
    .word 0x30
    .word 0x30
6 修改/board/tekkaman/tekkaman2410/tekkaman2410.c
因为博创2410－S和smdk2410的GPIO连接有所不同，我依旧利用博创配的vivi，修改其对GPIO的配置(具体原因请参阅博创2410－S的硬件说明和2410芯片手册)：
......
    gpio->GPEUP = 0x0000FFFF;
    gpio->GPFCON = 0x000051aa; //0x000055AA; tekkaman
    gpio->GPFUP = 0x000000ef; //0x000000FF; tekkaman
    gpio->GPGCON = 0xfd95ffba; //0xFF95FFBA; tekkaman
    gpio->GPGUP = 0x0000efff; //0x0000FFFF; tekkaman
    gpio->GPHCON = 0x0016faaa; //0x002AFAAA; tekkaman
    gpio->GPHUP = 0x000007FF;
......

7 为了实现NAND Flash的读写，再次修改/include/configs/tekkaman2410.h
(请格外注意：如果编译时报错，请在Linux用KWrite看看文件的注释是不是为灰色，如果不是,则将注释删除。因为#define后面的注释被认为是程序的一部分。建议注释和#define分行写)
......
/*
* Hardware drivers
*/
//#define CONFIG_DRIVER_CS8900    1    /* we have a CS8900 on-board */
//#define CS8900_BASE        0x19000300
//#define CS8900_BUS16        1 /* the Linux driver does accesses as shorts */
#define CONFIG_DRIVER_NE2000
#define CONFIG_DRIVER_NE2000_BASE (0x10000000+0x200)
......

/***********************************************************
* Command definition
***********************************************************/
#define CONFIG_COMMANDS \
            (CONFIG_CMD_DFL    | \
            CFG_CMD_CACHE    | \
            CFG_CMD_NAND    | \
            CFG_CMD_NET    | \
            /*CFG_CMD_EEPROM |*/ \
            /*CFG_CMD_I2C    |*/ \
            /*CFG_CMD_USB    |*/ \
            CFG_CMD_PING | \
          CFG_CMD_ENV | \
            CFG_CMD_REGINFO | \
            CFG_CMD_DATE    | \
            CFG_CMD_ELF)

/* this must be included AFTER the definition of CONFIG_COMMANDS (if any) */

......

#define    CFG_LONGHELP
/* undef to save memory        */
#define    CFG_PROMPT   "[Tekkaman2410]#"
/*Monitor Command Prompt */
#define    CFG_CBSIZE        256
/* Console I/O Buffer Size    */
......
#define    CFG_LOAD_ADDR    0x30000000
/* default load address    */

......

//#define PHYS_FLASH_1        0x00000000 /* Flash Bank #1 */

//#define CFG_FLASH_BASE        PHYS_FLASH_1

/*-----------------------------------------------------------------------
* FLASH and environment organization
*/
#define CFG_NO_FLASH    1
#if 0
#define CONFIG_AMD_LV400    1    /* uncomment this if you have a LV400 flash */
//#if 0
#define CONFIG_AMD_LV800    1    /* uncomment this if you have a LV800 flash */
#endif

//#define CFG_MAX_FLASH_BANKS    1    /* max number of memory banks */
......

/* timeout values are in ticks */
//#define CFG_FLASH_ERASE_TOUT    (5*CFG_HZ)
/* Timeout for Flash Erase */
//#define CFG_FLASH_WRITE_TOUT    (5*CFG_HZ)
/* Timeout for Flash Write */

#define    CFG_ENV_IS_IN_NAND    1
#define CFG_ENV_OFFSET 0X20000
//#define ENV_IS_EMBEDDED 1
#define CFG_NAND_LEGACY

#define CFG_ENV_SIZE    0x10000
/* Total Size of Environment Sector */

#if (CONFIG_COMMANDS & CFG_CMD_NAND)
#define CFG_NAND_BASE 0x4E000000
/* NandFlash控制器在SFR区起始寄存器地址 */
#define CFG_MAX_NAND_DEVICE 1
/* 支持的最在Nand Flash数据 */
#define SECTORSIZE 512
/* 1页的大小 */
#define NAND_SECTOR_SIZE SECTORSIZE
#define NAND_BLOCK_MASK 511
/* 页掩码 */
#define ADDR_COLUMN 1
/* 一个字节的Column地址 */
#define ADDR_PAGE 3
/* 3字节的页块地址!!!!!*/
#define ADDR_COLUMN_PAGE 4
/* 总共4字节的页块地址!!!!! */
#define NAND_ChipID_UNKNOWN 0x00
/* 未知芯片的ID号 */
#define NAND_MAX_FLOORS 1
#define NAND_MAX_CHIPS 1
/* Nand Flash命令层底层接口函数 */
#define WRITE_NAND_COMMAND(d, adr) {rNFCMD = d;}
#define WRITE_NAND_ADDRESS(d, adr) {rNFADDR = d;}
#define WRITE_NAND(d, adr) {rNFDATA = d;}
#define READ_NAND(adr) (rNFDATA)
#define NAND_WAIT_READY(nand) {while(!(rNFSTAT&(1<<0)));}
#define NAND_DISABLE_CE(nand) {rNFCONF |= (1<<11);}
#define NAND_ENABLE_CE(nand) {rNFCONF &= ~(1<<11);}

/* the following functions are NOP's because S3C24X0 handles this in hardware 一定要加上 */

#define NAND_CTL_CLRALE(nandptr)

#define NAND_CTL_SETALE(nandptr)

#define NAND_CTL_CLRCLE(nandptr)

#define NAND_CTL_SETCLE(nandptr)
/* 允许Nand Flash写校验 */
#define CONFIG_MTD_NAND_VERIFY_WRITE 1

*
* Nandflash Boot
*/
#define CONFIG_S3C2410_NAND_BOOT 1
#define STACK_BASE    0x33f00000
#define STACK_SIZE    0x8000
//#define UBOOT_RAM_BASE    0x33f80000
/* NAND Flash Controller */
#define NAND_CTL_BASE            0x4E000000
#define bINT_CTL(Nb)        __REG(INT_CTL_BASE + (Nb))
/* Offset */

#define oNFCONF               0x00
#define oNFCMD                0x04
#define oNFADDR               0x08
#define oNFDATA               0x0c
#define oNFSTAT               0x10
#define oNFECC                0x14

#define rNFCONF (*(volatile unsigned int *)0x4e000000)
#define rNFCMD (*(volatile unsigned char *)0x4e000004)
#define rNFADDR (*(volatile unsigned char *)0x4e000008)
#define rNFDATA (*(volatile unsigned char *)0x4e00000c)
#define rNFSTAT (*(volatile unsigned int *)0x4e000010)
#define rNFECC (*(volatile unsigned int *)0x4e000014)
#define rNFECC0 (*(volatile unsigned char *)0x4e000014)
#define rNFECC1 (*(volatile unsigned char *)0x4e000015)
#define rNFECC2 (*(volatile unsigned char *)0x4e000016)

#endif /* CONFIG_COMMANDS & CFG_CMD_NAND*/

#endif    /* __CONFIG_H */

8 在 include/linux/mtd/nand_ids.h的结构体nand_flash_ids加入

static struct nand_flash_dev nand_flash_ids[] = {

......
    {"Samsung KM29N16000",NAND_MFR_SAMSUNG, 0x64, 21, 1, 2, 0x1000, 0},
    {"Samsung K9F1208U0M", NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
    {"Samsung unknown 4Mb", NAND_MFR_SAMSUNG, 0x6b, 22, 0, 2, 0x2000, 0},
......

{NULL,}

};

9 修改/lib_arm中的board.c。

static int display_banner (void)
{
    printf ("\n\n%s\n\n", version_string);
    debug ("U-Boot code: %08lX -> %08lX BSS: -> %08lX\n",
           _armboot_start, _bss_start, _bss_end);
    printf ("U-Boot code: %08lX -> %08lX BSS: -> %08lX\n",    //tekkaman
        _armboot_start, _bss_start, _bss_end);      //tekkaman
#ifdef CONFIG_MODEM_SUPPORT
    debug ("Modem Support enabled\n");
#endif
#ifdef CONFIG_USE_IRQ
    debug ("IRQ Stack: %08lx\n", IRQ_STACK_START);
    debug ("FIQ Stack: %08lx\n", FIQ_STACK_START);
#endif

    return (0);
}

10 修改common/env_nand.c
......
#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif

int nand_legacy_rw (struct nand_chip* nand, int cmd,
        size_t start, size_t len,
        size_t * retlen, u_char * buf);
extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];
extern int nand_legacy_erase(struct nand_chip *nand, size_t ofs, size_t len, int clean);

/* info for NAND chips, defined in drivers/nand/nand.c */
extern nand_info_t nand_info[CFG_MAX_NAND_DEVICE];

......

#else /* ! CFG_ENV_OFFSET_REDUND */
int saveenv(void)
{
    ulong total;
    int ret = 0;

    puts ("Erasing Nand...");
    //if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))

if (nand_legacy_erase(nand_dev_desc + 0, CFG_ENV_OFFSET, CFG_ENV_SIZE, 0))
        return 1;

    puts ("Writing to Nand... ");
    total = CFG_ENV_SIZE;
    //ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);

ret = nand_legacy_rw(nand_dev_desc + 0,

0x00 | 0x02, CFG_ENV_OFFSET, CFG_ENV_SIZE,

&total, (u_char*)env_ptr);

    if (ret || total != CFG_ENV_SIZE)
        return 1;

    puts ("done\n");
    return ret;
......
#else /* ! CFG_ENV_OFFSET_REDUND */
/*
* The legacy NAND code saved the environment in the first NAND device i.e.,
* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
*/
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
    ulong total;
    int ret;

    total = CFG_ENV_SIZE;
    //ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
    ret = nand_legacy_rw(nand_dev_desc + 0, 0x01 | 0x02, CFG_ENV_OFFSET, CFG_ENV_SIZE, &total, (u_char*)env_ptr);

......

11 在/board/tekkaman/tekkaman2410/tekkaman2410.c文件的末尾添加对Nand Flash 的初始化函数（在后面Nand Flash的操作都要用到）

u-boot运行至第二阶段进入start_armboot()函数。其中nand_init()函数是对nand flash的最初初始化函数。Nand_init()函数在两个文件中实现。其调用与CFG_NAND_LEGACY宏有关，如果没有定义这个宏，系统调用 drivers/nnd/nand.c中的nand_init()；否则调用自己在board/smdk2410/smdk2410.c中的nand_init()函数。这里我选择第二种方式。

#if (CONFIG_COMMANDS & CFG_CMD_NAND)
typedef enum {
NFCE_LOW,
NFCE_HIGH
} NFCE_STATE;

static inline void NF_Conf(u16 conf)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFCONF = conf;
}

static inline void NF_Cmd(u8 cmd)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFCMD = cmd;
}

static inline void NF_CmdW(u8 cmd)
{
NF_Cmd(cmd);
udelay(1);
}

static inline void NF_Addr(u8 addr)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFADDR = addr;
}

static inline void NF_SetCE(NFCE_STATE s)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

switch (s) {
case NFCE_LOW:
nand->NFCONF &= ~(1<<11);
break;

case NFCE_HIGH:
nand->NFCONF |= (1<<11);
break;
}
}

static inline void NF_WaitRB(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

while (!(nand->NFSTAT & (1<<0)));
}

static inline void NF_Write(u8 data)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFDATA = data;
}

static inline u8 NF_Read(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

return(nand->NFDATA);
}

static inline void NF_Init_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

nand->NFCONF |= (1<<12);
}

static inline u32 NF_Read_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

return(nand->NFECC);
}

#endif

* NAND flash initialization.
*/
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
extern ulong nand_probe(ulong physadr);

static inline void NF_Reset(void)
{
int i;

NF_SetCE(NFCE_LOW);
NF_Cmd(0xFF); /* reset command */
for(i = 0; i < 10; i++); /* tWB = 100ns. */
NF_WaitRB(); /* wait 200~500us; */
NF_SetCE(NFCE_HIGH);
}

static inline void NF_Init(void)
{
#if 0 /* a little bit too optimistic */
#define TACLS 0
#define TWRPH0 3
#define TWRPH1 0
#else
#define TACLS 0
#define TWRPH0 4
#define TWRPH1 2
#endif

NF_Conf((1<<15)|(0<<14)|(0<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0));
/*nand->NFCONF = (1<<15)|(1<<14)|(1<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0); */
/* 1 1 1 1, 1 xxx, r xxx, r xxx */
/* En 512B 4step ECCR nFCE=H tACLS tWRPH0 tWRPH1 */

NF_Reset();
}

void
nand_init(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();

NF_Init();
#ifdef DEBUG
printf("NAND flash probing at 0x%.8lX\n", (ulong)nand);
#endif
printf ("%4lu MB\n", nand_probe((ulong)nand) >> 20);
}
#endif

12 修正U－Boot的NE2000驱动的低级错误（虽然暂时驱动还有问题，但还是先编进去，以后改好了再make就好了）
将第45行：
at */

改为：
at

真是TNND汗死

！！！！
13 因为没有Nor Flash芯片，所以注释掉/common/cmd_bootm.c中关于imls命令的程序段和/common/cmd_flash.c中的程序。不然，按上面的修改，编译会出错。

/common/cmd_bootm.c第91行：（“0”后面一定要换行！！！不然还会错！！！）
#if 0
(CONFIG_COMMANDS & CFG_CMD_IMLS)
#include
extern flash_info_t flash_info[]; /* info for FLASH chips */
static int do_imls (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
#endif

/common/cmd_bootm.c第1237行：（“0”后面一定要换行！！！不然还会错！！！）
#if 0
(CONFIG_COMMANDS & CFG_CMD_IMLS)
/*-----------------------------------------------------------------------
* List all images found in flash.
*/
int do_imls (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
    flash_info_t *info;
    int i, j;
    image_header_t *hdr;
    ulong data, len, checksum;

    for (i=0, info=&flash_info[0]; i        if (info->flash_id == FLASH_UNKNOWN)
......

/common/cmd_flash.c开头几行：（“0”后面一定要换行！！！不然还会错！！！）

......
#if 0
(CONFIG_COMMANDS & CFG_CMD_FLASH)

#if (CONFIG_COMMANDS & CFG_CMD_JFFS2) && defined(CONFIG_JFFS2_CMDLINE)
#include
......

三、交叉编译U－Boot。
在U－Boot的根目录下
$make
一阵English飘过～～～～～～～～～～～～～～～～～～～～～～～
严格按上面的修改，应该是会成功的，因为我本着认真负责的态度，按上面的步骤又做了一遍，改了一遍，且编译成功。
如果你还遇到错误，可以找我讨论 QQ：78027228。
不过我建议：在看懂U－Boot的基础上移植，不然当有错误时你会狂郁闷，不知如何下手！

声明：tftp相关命令有问题，因为NE2000的驱动还没改过，以后改好了一定写上来！

u boot 移植移植U－Boot.1.3.1到S3C2440和S3C2410 u-boot 2008.10 移植手记 U-BOOT移植 u-boot-1.3.4移植到FS2410 移植U－Boot.1.3.1到S3C2440和S3C2410 移植U－Boot.1.3.1到S3C244和S3C2410

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