扬创utu2440板子uboot1.3.4(带DM9000A网卡)的移植详细步骤

注明:本篇文章，绝大部分都是来源与tekkaman的**移植U－Boot.1.3.1到S3C244和S3C2410，原文链接http://blog.chinaunix.net/u1/34474/showart.php?id=487416，只是因为uboot1.3.4与uboot1.3.1有部分不同，结合自己的调试经历，写下此篇，希望新手不会像我这样曲折。**

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: utu2440  
1 进入U-Boot目录，修改Makefile
[root@localhost u-boot-1.3.4]$ vim Makefile
#为utu2440建立编译项
smdk2410_config :       unconfig
        @$(MKCONFIG) $(@:_config=) arm arm920t smdk2410 NULL s3c24x0

utu2440_config :       unconfig
        @$(MKCONFIG) $(@:_config=) arm arm920t utu2440 NULL 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。
utu2440: 开发板的型号(BOARD)，对应于board/utu2440/目录,我将smdk2410覆盖了
NULL: 开发者/或经销商(vender)。
s3c24x0: 片上系统(SOC)。

设置环境变量
[root@localhost u-boot-1.3.4]# vim /root/.bash_profile
在PATH一行后添加/usr/local/arm/3.3.2/bin:PATH

2 在/board子目录中建立自己的开发板utu2440目录
[root@localhost u-boot-1.3.4]$ cd board
[root@localhost board]# cp -raf smdk2410/ utu2440
[root@localhost board]# cd utu2440
[root@localhost utu2440]# mv smdk2410.c utu2440.c
 
 还要记得修改自己的开发板tekkaman2440目录下的Makefile文件，不然编译时会出错：
[root@localhost utu2440]# vim Makefile
COBJS    := utu2440.o flash.o

3 在include/configs/中建立配置头文件
[root@localhost u-boot-1.3.4]＃ cp include/configs/smdk2410.h include/configs/utu2440.h
4 测试编译能否成功
  1）配置
[root@localhost u-boot-1.3.4]＃ make tekkaman2440_config
Configuring for utu2440 board…
注：
     (1) 如果出现：
     [root@localhost u-boot-1.3.4]# make utu2440_config
Makefile:2497: *** 遗漏分隔符  (您的意思是用 TAB 代替 8 个空格？)。 停止。
      请在U－boot的根目录下的Makefile的
        @$(MKCONFIG) $(@:_config=) arm arm920t utu2440 NULL s3c24x0)
       前加上“Tab”键

2）测试编译
[root@localhost u-boot-1.3.4]$make

0、修改makefile文件
__LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))
改为：
__LIBS := $(subst $(obj),,$(LIBBOARD)) $(subst $(obj),,$(LIBS))

二、进行移植，修改uboot代码

1、修改/cpu/arm920t/start.S
#include
#include
#if    defined(CONFIG_AT91RM9200DK)
#include     /*这是针对AT91RM9200DK开发板的。
#endif
……
/*
 * the actual start code
 */

start_code:
    /*
     * set the cpu to SVC32 mode
     */
    mrs    r0,cpsr
    bic    r0,r0,#0x1f
    orr    r0,r0,#0xd3
    msr    cpsr,r0
#if    defined(CONFIG_AT91RM9200DK)
    bl coloured_LED_init
    bl red_LED_on
#endif
 (0)修改寄存器地址定义
#if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410)|| defined(CONFIG_S3C2440)
    /* turn off the watchdog */

#if defined(CONFIG_S3C2400)
#define pWTCON        0x15300000
#define INTMSK        0x14400008    /* Interupt-Controller base addresses */
#define CLKDIVN    0x14800014    /* clock divisor register */
#else
#define pWTCON        0x53000000
#define INTMSK        0x4A000008    /* Interupt-Controller base addresses */
#define INTSUBMSK    0x4A00001C
#define CLKDIVN    0x4C000014    /* clock divisor register */
#define CLK_CTL_BASE  0x4C000000  
#define MPLLCON       4       /*MPLLCON的偏移地址*/
#endif
   
……
(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，U－Boot一直没改过来。*/
    ldr r0, =INTSUBMSK
    str r1, [r0]
#endif
#if defined(CONFIG_S3C2440)
    ldr r1, =0x7fff /*根据2440芯片手册，INTSUBMSK有15位可用*/
    ldr r0, =INTSUBMSK
    str r1, [r0]
#endif
(2)修改时钟设置（2440的主频为405MHz。）
# if defined(CONFIG_S3C2440)
    /* FCLK:HCLK:PCLK = 1:4:8 */
    ldr r0, =CLKDIVN
    mov r1, #5
    str r1, [r0]
   
    mrc p15, 0, r1, c1, c0, 0 /*read ctrl register */
    orr r1, r1, #0xc0000000 /*Asynchronous */
    mcr p15, 0, r1, c1, c0, 0 /*write ctrl register*/

    /*now, CPU clock is 405.00 Mhz 这边直接copy了vivi的部分代码*/
  mov     r1, #CLK_CTL_BASE
        @ldr    r2, mpll_value                  @ clock default
        ldr     r2, =0x7f021    @mpll_value_USER
        str     r2, [r1, #MPLLCON]

#else
    ldr    r0, =CLKDIVN
    mov    r1, #3
    str    r1, [r0]

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

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

# endif
#endif    /* CONFIG_S3C2400 || CONFIG_S3C2410|| CONFIG_S3C2440 */
        /*
         * we do sys-critical inits only at reboot,
         * not when booting from ram!
         */
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
        bl      cpu_init_crit
#endif
    mov r1, #GPIO_CTL_BASE
    add r1, r1, #oGPIO_F
    ldr r2,=0x55aa
    str r2, [r1, #oGPIO_CON]
    mov r2, #0xff
    str r2, [r1, #oGPIO_UP]
    mov r2, #0x0
    str r2, [r1, #oGPIO_DAT]    /*时钟以及内存配置配置好后灯全亮*/

(3)将从Flash启动改成从NAND Flash启动。
注释掉以下U－Boot的重定向语句
#ifdef    CONFIG_AT91RM9200

#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     {r3-r10}        /* copy from source address [r0] */
    stmia     {r3-r10}        /* copy to target address [r1] */
    cmp    r0, r2            /* until source end addreee [r2] */
    ble    copy_loop
#endif    /* CONFIG_SKIP_RELOCATE_UBOOT */
#endif
然后copy vivi中从nand启动的代码
#ifdef CONFIG_S3C2440_NAND_BOOT
    @ reset NAND
    mov r1, #NAND_CTL_BASE
    ldr r2, =( (7<<12)|(7<<8)|(7<<4)|(0<<0) )
    str r2, [r1, #oNFCONF]
    ldr r2, [r1, #oNFCONF]

    ldr r2, =( (1<<4)|(0<<1)|(1<<0) ) @ Active low CE Control
    str r2, [r1, #oNFCONT]
    ldr r2, [r1, #oNFCONT]

    ldr r2, =(0x6) @ RnB Clear
    str r2, [r1, #oNFSTAT]
    ldr r2, [r1, #oNFSTAT]
   
    mov r2, #0xff @ RESET command
    strb r2, [r1, #oNFCMD]

  mov r3, #0 @ wait
1:
  add r3, r3, #0x1
  cmp r3, #0xa
  blt 1

2:
  ldr r2, [r1, #oNFSTAT] @ wait ready
  tst r2, #0x4      @When RnB low to high transition is occurred, this value set
  beq 2

    ldr r2, [r1, #oNFCONT]
    orr r2, r2, #0x2 @ Flash Memory Chip Disable
    str r2, [r1, #oNFCONT]

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

@ copy U-Boot to RAM
  ldr r0, =TEXT_BASE
  mov r1, #0x0
  mov r2, #0x30000
  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_S3C2440_NAND_BOOT

#ifdef CONFIG_S3C2410_NAND_BOOT
@ 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
1:
  add r3, r3, #0x1
  cmp r3, #0xa
  blt nand1

2:
  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 s (for nand_read())
  ldr sp, DW_STACK_START @ setup stack pointer
  mov fp, #0 @ no previous , so fp=0

@ copy U-Boot to RAM
  ldr r0, =TEXT_BASE
  mov r1, #0x0
  mov r2, #0x30000      //还不知道为啥要由20000改成30000
  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

在“ldr    pc, _start_armboot”之前加入：
mov r1, #GPIO_CTL_BASE
    add r1, r1, #oGPIO_F
    mov r2, #0xc0
    str r2, [r1, #oGPIO_DAT]

在 “  _start_armboot:    .word start_armboot  ” 后加入：
.align 2
DW_STACK_START: .word STACK_BASE+STACK_SIZE-4
2  在board/utu2440加入NAND Flash读函数文件，拷贝vivi中的nand_read.c文件到board/utu2440/即可不需要作任何改动：
#include

#define __REGb(x) (*(volatile unsigned char *)(x))
#define __REGi(x) (*(volatile unsigned int *)(x))
#define NF_BASE 0x4e000000

# if defined(CONFIG_S3C2440)

#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 GPDAT __REGi(GPIO_CTL_BASE+oGPIO_F+oGPIO_DAT)

#define NAND_CHIP_ENABLE (NFCONT &= ~(1<<1))
#define NAND_CHIP_DISABLE (NFCONT |= (1<<1))
#define NAND_CLEAR_RB (NFSTAT |= (1<<2))
#define NAND_DETECT_RB { while(! (NFSTAT&(1<<2)) );}

#define BUSY 4
inline void wait_idle(void) {
    while(!(NFSTAT & BUSY));
    NFSTAT |= BUSY;
}

#define NAND_SECTOR_SIZE 512
#define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1)

/* low level nand read */
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 */
    }

    NAND_CHIP_ENABLE;

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

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

        NAND_DETECT_RB;

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

# if defined(CONFIG_S3C2410)

#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 */ 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;
}
# endif
3 修改board/utu2440/Makefile文件
……
OBJS := utu2440.o nand_read.o flash.o
……
4 修改include/configs/utu2440.h文件，添加如下内容：
……
/*
 * Nandflash Boot
 */
#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

# if defined(CONFIG_S3C2440)
#define CONFIG_S3C2440_NAND_BOOT 1
/* Offset */
#define oNFCONT 0x04
#define oNFCMD 0x08
#define oNFADDR 0x0c
#define oNFDATA 0x10
#define oNFSTAT 0x20
#define oNFECC 0x2c
#define rNFCONF (*(volatile unsigned int *)0x4e000000)
#define rNFCONT (*(volatile unsigned int *)0x4e000004)
#define rNFCMD (*(volatile unsigned char *)0x4e000008)
#define rNFADDR (*(volatile unsigned char *)0x4e00000c)
#define rNFDATA (*(volatile unsigned char *)0x4e000010)
#define rNFSTAT (*(volatile unsigned int *)0x4e000020)
#define rNFECC (*(volatile unsigned int *)0x4e00002c)
/* GPIO */
#define GPIO_CTL_BASE 0x56000000
#define oGPIO_F  0x50
#define oGPIO_CON  0x0 /* R/W, Configures the pins of the port */
#define oGPIO_DAT  0x4 /* R/W, Data register for port */
#define oGPIO_UP  0x8 /* R/W, Pull-up disable register */
#endif
#endif /* __CONFIG_H */
5 修改board/utu2440/lowlevel_init.S文件
    依照开发板的内存区的配置情况, 修改board/utu2440/lowlevel_init.S文件，我利用友善之臂提供的vivi源码里的信息做了如下更改:
……
#define B1_BWSCON        (DW16)
#define B2_BWSCON        (DW16)
#define B3_BWSCON        (DW16 + WAIT + UBLB)
#define B4_BWSCON        (DW16)
#define B5_BWSCON        (DW16)
#define B6_BWSCON        (DW32)
#define B7_BWSCON        (DW32)
……
#define B2_Tacs            0x0
#define B2_Tcos            0x0
#define B2_Tacc            0x7
#define B2_Tcoh            0x0
#define B2_Tah            0x0
#define B2_Tacp            0x0
#define B2_PMC            0x0
#endif
……

/* REFRESH parameter */
#define REFEN            0x1    /* Refresh enable */
#define TREFMD            0x0    /* CBR(CAS before RAS)/Auto refresh */
#define Trc            0x3    /* 7clk */
#define Tchr            0x2    /* 3clk */

# if defined(CONFIG_S3C2440)
#define Trp            0x2    /* 4clk */
#define REFCNT            1265
#endif

/**************************************/

_TEXT_BASE:

.word TEXT_BASE

.globl lowlevel_init

lowlevel_init:

/* memory control configuration */

/* make r0 relative the current location so that it */

/* reads SMRDATA out of FLASH rather than memory ! */

//ldr r0, =SMRDATA

adrl r0, SMRDATA //edited by yaoyi 20090312

ldr r1, _TEXT_BASE

// sub r0, r0, r1

ldr r1, =BWSCON /* Bus Width Status Controller */

add r2, r0, #13*4

0:

ldr r3, [r0], #4

str r3, [r1], #4

cmp r2, r0

bne 0b

6 修改/board/utu2440/utu2440.c
 修改其对GPIO和PLL的配置(请参阅开发板的硬件说明和芯片手册)：
……
#define FCLK_SPEED 1

#if FCLK_SPEED==0        /* Fout = 203MHz, Fin = 12MHz for Audio */
#define M_MDIV    0xC3
#define M_PDIV    0x4
#define M_SDIV    0x1
#elif FCLK_SPEED==1       

#if defined(CONFIG_S3C2410)
/* Fout = 202.8MHz */
#define M_MDIV    0xA1
#define M_PDIV    0x3
#define M_SDIV    0x1
#endif

#if defined(CONFIG_S3C2440)
/* Fout = 405MHz */
#define M_MDIV 0x7f       
#define M_PDIV 0x2
#define M_SDIV 0x1
#endif

#define USB_CLOCK 1

#if USB_CLOCK==0
#define U_M_MDIV    0xA1
#define U_M_PDIV    0x3
#define U_M_SDIV    0x1
#elif USB_CLOCK==1

#if defined(CONFIG_S3C2410)
#define U_M_MDIV    0x48
#define U_M_PDIV    0x3
#endif

#if defined(CONFIG_S3C2440)
#define U_M_MDIV 0x38
#define U_M_PDIV 0x2
#endif

#define U_M_SDIV    0x2
#endif
……
int board_init (void)
{
    ……
   gpio->GPFDAT=0xaf; //板子初始化完后，亮灯
   ……
}
7 为了实现NAND Flash的读写，再次修改/include/configs/utu2440.h

……
/*
 * High Level Configuration Options
 * (easy to change)
 */
#define CONFIG_ARM920T        1    /* This is an ARM920T Core    */
//#define    CONFIG_S3C2410        1    /* in a SAMSUNG S3C2410 SoC     */   //edited by yaoyi 20090312
//#define CONFIG_SMDK2410        1    /* on a SAMSUNG SMDK2410 Board  */  //edited by yaoyi 20090312
#define CONFIG_utu2440         1
#define CONFIG_S3C2440         1     
…….
#include
#define CONFIG_CMD_ELF
#define CONFIG_CMD_DATE
#define CONFIG_CMD_CACHE
//edited by yaoyi 20090312
#define CONFIG_CMD_ASKENV    
#define CONFIG_CMD_DHCP
#define CONFIG_CMD_PING
#define CONFIG_CMD_NAND
#define CONFIG_CMD_REGINFO
//edited by yaoyi 20090312
#define CONFIG_BOOTDELAY    3
/*#define CONFIG_BOOTARGS    "root=ramfs devfs=mount console=ttySA0,9600" */
#define CONFIG_ETHADDR        08:00:3e:26:0a:5b
#define CONFIG_NETMASK          255.255.255.0
#define CONFIG_IPADDR        192.168.1.110
#define CONFIG_SERVERIP        192.168.1.1
/*#define CONFIG_BOOTFILE    "elinos-lart" */
/*#define CONFIG_BOOTCOMMAND    "tftp; bootm" */

#if defined(CONFIG_CMD_KGDB)
#define CONFIG_KGDB_BAUDRATE    115200        /* speed to run kgdb serial port */
/* what's this ? it's not used anywhere */
#define CONFIG_KGDB_SER_INDEX    1        /* which serial port to use */
#endif

/*
 * Miscellaneous configurable options
 */
#define    CFG_LONGHELP                /* undef to save memory        */
#define    CFG_PROMPT        "utu2440 # "    /* Monitor Command Prompt    */
#define    CFG_CBSIZE        256        /* Console I/O Buffer Size    */
#define    CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */
#define    CFG_MAXARGS        16        /* max number of command args    */
#define CFG_BARGSIZE        CFG_CBSIZE    /* Boot Argument Buffer Size    */

#define CFG_MEMTEST_START    0x30000000    /* memtest works on    */
#define CFG_MEMTEST_END        0x33F00000    /* 63 MB in DRAM    */

#undef  CFG_CLKS_IN_HZ        /* everything, incl board info, in Hz */

//#define    CFG_LOAD_ADDR        0x33000000    /* default load address    */
#define     CFG_LOAD_ADDR         0x30008000     //edited by yaoyi 20090312
/* the PWM TImer 4 uses a counter of 15625 for 10 ms, so we need */
/* it to wrap 100 times (total 1562500) to get 1 sec. */
#define    CFG_HZ            1562500

/* valid baudrates */
#define CFG_BAUDRATE_TABLE    { 9600, 19200, 38400, 57600, 115200 }

/*-----------------------------------------------------------------------
 * Stack sizes
 *
 * The stack sizes are set up in start.S using the settings below
 */
#define CONFIG_STACKSIZE    (128*1024)    /* regular stack */
#ifdef CONFIG_USE_IRQ
#define CONFIG_STACKSIZE_IRQ    (4*1024)    /* IRQ stack */
#define CONFIG_STACKSIZE_FIQ    (4*1024)    /* FIQ stack */
#endif

/*-----------------------------------------------------------------------
 * Physical Memory Map
 */
#define CONFIG_NR_DRAM_BANKS    1       /* we have 1 bank of DRAM */
#define PHYS_SDRAM_1        0x30000000 /* SDRAM Bank #1 */
#define PHYS_SDRAM_1_SIZE    0x04000000 /* 64 MB */

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

#define CFG_FLASH_BASE        PHYS_FLASH_1

/*-----------------------------------------------------------------------
 * FLASH and environment organization
 */

#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 */
#ifdef CONFIG_AMD_LV800
#define PHYS_FLASH_SIZE        0x00100000 /* 1MB */
#define CFG_MAX_FLASH_SECT    (19)    /* max number of sectors on one chip */
#define CFG_ENV_ADDR        (CFG_FLASH_BASE + 0x0F0000) /* addr of environment */
#endif
#ifdef CONFIG_AMD_LV400
#define PHYS_FLASH_SIZE        0x00080000 /* 512KB */
#define CFG_MAX_FLASH_SECT    (11)    /* max number of sectors on one chip */
#define CFG_ENV_ADDR        (CFG_FLASH_BASE + 0x070000) /* addr of environment */
#endif

/* 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_FLASH    1     //edited by yaoyi 20090312
#define CFG_ENV_IS_IN_NAND      1
#define CFG_ENV_OFFSET         0x30000
#define CFG_NAND_LEGACY     
#define CFG_ENV_SIZE        0x10000    /* Total Size of Environment Sector */
//edited by yaoyi 20090312
#if defined(CONFIG_CMD_NAND)
#define CFG_NAND_BASE         0x4E000000     //edited by yaoyi 20090312
#define CFG_MAX_NAND_DEVICE     1
#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_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 WRITE_NAND_COMMAND(d, adr) {rNFCMD = d;}
#define WRITE_NAND_COMMANDW(d, adr)    NF_CmdW(d)

# if defined(CONFIG_S3C2440)
#define NAND_DISABLE_CE(nand) {rNFCONT |= (1<<1);}
#define NAND_ENABLE_CE(nand) {rNFCONT &= ~(1<<1);}
#endif
# if defined(CONFIG_S3C2410)
#define NAND_DISABLE_CE(nand) {rNFCONF |= (1<<11);}
#define NAND_ENABLE_CE(nand) {rNFCONF &= ~(1<<11);}
#endif

/* the following functions are NOP's because S3C24X0 handles this in hardware */

#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 STACK_BASE         0x33f00000
#define STACK_SIZE         0x8000
/* NAND Flash Controller */
#define NAND_CTL_BASE 0x4E000000
#define bINT_CTL(Nb) __REG(INT_CTL_BASE + (Nb))
/* Offset */
#define oNFCONF 0x00

# if defined(CONFIG_S3C2440)
#define CONFIG_S3C2440_NAND_BOOT 1
/* Offset */
#define oNFCONT 0x04
#define oNFCMD 0x08
#define oNFADDR 0x0c
#define oNFDATA 0x10
#define oNFSTAT 0x20
#define oNFECC 0x2c
#define rNFCONF (*(volatile unsigned int *)0x4e000000)
#define rNFCONT (*(volatile unsigned int *)0x4e000004)
#define rNFCMD (*(volatile unsigned char *)0x4e000008)
#define rNFADDR (*(volatile unsigned char *)0x4e00000c)
#define rNFDATA (*(volatile unsigned char *)0x4e000010)
#define rNFSTAT (*(volatile unsigned int *)0x4e000020)
#define rNFECC (*(volatile unsigned int *)0x4e00002c)

#define GPIO_CTL_BASE 0x56000000
#define oGPIO_F 0x50
#define oGPIO_CON 0x0 /* R/W, Configures the pins of the port */
#define oGPIO_DAT 0x4 /* R/W, Data register for port */
#define oGPIO_UP 0x8 /* R/W, Pull-up disable register */
#endif  //edited by yaoyi 20090312
#endif
#endif    /* __CONFIG_H */
8、在个文件中添加“CONFIG_S3C2440”，使得原来s3c2410的代码可以编译进来。
（1）/include/common.h文件的第474行：
#if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410) || defined(CONFIG_LH7A40X) || defined(CONFIG_S3C2440)
（2）/include/s3c24x0.h文件的第85、95、99、110、148、404行：
将“#ifdef CONFIG_S3C2410”改为
#if defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)

顺便在其中加入2440 的NAND FLASH 寄存器定义（第160行附近）和CAMDIVN定义（第128行附近）：
……
typedef struct {
         S3C24X0_REG32 LOCKTIME;
         S3C24X0_REG32 MPLLCON;
         S3C24X0_REG32 UPLLCON;
         S3C24X0_REG32 CLKCON;
         S3C24X0_REG32 CLKSLOW;
         S3C24X0_REG32 CLKDIVN;
#if defined (CONFIG_S3C2440)
         S3C24X0_REG32 CAMDIVN;
#endif
} /*__attribute__((__packed__))*/ S3C24X0_CLOCK_POWER;
……
#if defined(CONFIG_S3C2410)
/* NAND FLASH (see S3C2410 manual chapter 6) */
typedef struct {
         S3C24X0_REG32 NFCONF;
         S3C24X0_REG32 NFCMD;
         S3C24X0_REG32 NFADDR;
         S3C24X0_REG32 NFDATA;
         S3C24X0_REG32 NFSTAT;
         S3C24X0_REG32 NFECC;
} /*__attribute__((__packed__))*/ S3C2410_NAND;
#endif
#if defined (CONFIG_S3C2440)
/* NAND FLASH (see S3C2440 manual chapter 6) */
typedef struct {
         S3C24X0_REG32 NFCONF;
         S3C24X0_REG32 NFCONT;
         S3C24X0_REG32 NFCMD;
         S3C24X0_REG32 NFADDR;
         S3C24X0_REG32 NFDATA;
         S3C24X0_REG32 NFMECC0;
         S3C24X0_REG32 NFMECC1;
         S3C24X0_REG32 NFSECC;
         S3C24X0_REG32 NFSTAT;
         S3C24X0_REG32 NFESTAT0;
         S3C24X0_REG32 NFESTAT1;
         S3C24X0_REG32 NFECC;
} /*__attribute__((__packed__))*/ S3C2440_NAND;
#endif
（3）/cpu/arm920t/s3c24x0/interrupts.c文件的第33行：
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) || defined (CONFIG_S3C2440)
第38行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
在个文件中添加“defined(CONFIG_tekkaman2440)”，使得原来SBC2410X的代码可以编译进来。第181行:
#elif defined(CONFIG_SBC2410X) || /
      defined(CONFIG_SMDK2410) || /
      defined(CONFIG_VCMA9) ||defined(CONFIG_utu2440)
（4）/cpu/arm920t/s3c24x0/serial.c文件的第22行：
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) || defined (CONFIG_S3C2440)
第26行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（5）/cpu/arm920t/s3c24x0/speed.c文件的第33行：
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) || defined (CONFIG_S3C2440)
第37行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
顺便修改源代码，以匹配s3c2440：
static ulong get_PLLCLK(int pllreg)
{
   ……

    m = ((r & 0xFF000) >> 12) + 8;
    p = ((r & 0x003F0) >> 4) + 2;
    s = r & 0x3;

#if defined(CONFIG_S3C2440)
   if (pllreg == MPLL)
    return((CONFIG_SYS_CLK_FREQ * m * 2) / (p << s));
    else if (pllreg == UPLL)
#endif

    return((CONFIG_SYS_CLK_FREQ * m) / (p << s)); } …… /* return FCLK frequency */ ulong get_FCLK(void) {     return(get_PLLCLK(MPLL)); }   /* return HCLK frequency */ ulong get_HCLK(void) {     S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER(); #if defined(CONFIG_S3C2440)     if (clk_power->CLKDIVN & 0x6)
                            {
                            if ((clk_power->CLKDIVN & 0x6)==2) return(get_FCLK()/2);
                            if ((clk_power->CLKDIVN & 0x6)==6) return((clk_power->CAMDIVN & 0x100) ? get_FCLK()/6 : get_FCLK()/3);
                            if ((clk_power->CLKDIVN & 0x6)==4) return((clk_power->CAMDIVN & 0x200) ? get_FCLK()/8 : get_FCLK()/4);
             return(get_FCLK());
                            }
 
       else return(get_FCLK());
#else
    return((clk_power->CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK());
#endif
}
……
（6）/cpu/arm920t/s3c24x0/usb_ohci.c文件的第45行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（7）drivers/rtc/s3c24x0_rtc.c文件的第35行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（8）/cpu/arm920t/s3c24x0/usb.c文件的第31行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（9）/cpu/arm920t/s3c24x0/i2c.c文件的第35行：
#elif defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
第66、85、142、150、174行：
将“#ifdef CONFIG_S3C2410”改为
#if defined(CONFIG_S3C2410) || defined (CONFIG_S3C2440)
（10）drivers/usb/usb_ohci.c文件的第68行附近：
#if defined(CONFIG_ARM920T) || /
    defined(CONFIG_S3C2400) || /
    defined(CONFIG_S3C2410) || /
    defined(CONFIG_S3C2440) || /
    defined(CONFIG_440EP) || /
    defined(CONFIG_PCI_OHCI) || /
    defined(CONFIG_MPC5200)
9、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 K9F1208U0B", NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
    {NULL,}
};
修改include/linux/mtd/nand.h
/*
 * Constants for hardware specific CLE/ALE/NCE
*/
#if 0
/* Select the chip by setting nCE to low */
#define NAND_CTL_SETNCE        1
/* Deselect the chip by setting nCE to high */
#define NAND_CTL_CLRNCE        2
/* Select the command latch by setting CLE to high */
#define NAND_CTL_SETCLE        3
/* Deselect the command latch by setting CLE to low */
#define NAND_CTL_CLRCLE        4
/* Select the address latch by setting ALE to high */
#define NAND_CTL_SETALE        5
/* Deselect the address latch by setting ALE to low */
#define NAND_CTL_CLRALE        6
/* Set write protection by setting WP to high. Not used! */
#define NAND_CTL_SETWP        7
/* Clear write protection by setting WP to low. Not used! */
#define NAND_CTL_CLRWP        8
#endif
10、修改/lib_arm中的board.c。
……
#include
#include
#include
#include
#include
#include
#include
 
 
……
void start_armboot (void)
{
         init_fnc_t **init_fnc_ptr;
         char *s;
#ifndef CFG_NO_FLASH
         ulong size;
#endif
#if defined(CONFIG_VFD) || defined(CONFIG_LCD)
         unsigned long addr;
#endif
   
         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();

……

         gpio->GPFDAT = 0x0;

//在进入命令提示符之前，四个LED会同时亮起！

#endif
         /* main_loop() can return to retry autoboot, if so just run it again. */
         for (;;) {
                   main_loop ();
         }
 
         /* NOTREACHED - no way out of command loop except booting */
}
 
11、 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 */
nand_info_t nand_info[CFG_MAX_NAND_DEVICE];

……

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

    nand_erase_options.length = CFG_ENV_RANGE;
    nand_erase_options.quiet = 0;
    nand_erase_options.jffs2 = 0;
    nand_erase_options.scrub = 0;
    nand_erase_options.offset = CFG_ENV_OFFSET;

    if (CFG_ENV_RANGE < CFG_ENV_SIZE)
        return 1;
    puts ("Erasing Nand…/n");
//    if (nand_erase_opts(&nand_info[0], &nand_erase_options))
    if (nand_legacy_erase(nand_dev_desc + 0, CFG_ENV_OFFSET, CFG_ENV_SIZE, 0))             //edited by yaoyi 20090312
            return 1;

    puts ("Writing to Nand… ");
    total = CFG_ENV_SIZE;
//    if (writeenv(CFG_ENV_OFFSET, (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);
//        puts("FAILED!/n");
//        return 1;
//    }
 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)
    size_t total;
    int ret;

    total = CFG_ENV_SIZE;
//    ret = readenv(CFG_ENV_OFFSET, (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);/*edited by yaoyi 20090314,1.3.4是先进入到readenv,而非直接调用nand_legacy_rw。 因此干脆就不用到readenv了，直接注释掉，添加以上代码 */
    if (ret || total != CFG_ENV_SIZE)
        return use_default();

    if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
        return use_default();
#endif /* ! ENV_IS_EMBEDDED */
}
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/nand/nand.c中的nand_init()；否则调用自己在board/utu2440/tekkaman2440.c中的nand_init()函数。这里我选择第二种方式。
12、 修改cpu/arm920t/s3c24x0/nand.c

#ifdef CONFIG_S3C2410_NAND_BBT
    nand->options = NAND_USE_FLASH_BBT;
……
#else
//#error "U-Boot legacy NAND support not available for S3C2410"  //edited by yaoyi 20090312
#endif
13、修改include/nand.h

…….
//#ifndef CFG_NAND_LEGACY
#include
#include
#include
…….

14、 在/board/utu2440/utu2440.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）
 

#if defined(CONFIG_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_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 u32 NF_Read_ECC(void)
{
    S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    return(nand->NFECC);
}

#if defined(CONFIG_S3C2440)
static inline void NF_Cont(u16 cont)
{
    S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    nand->NFCONT = cont;
}

static inline void NF_SetCE(NFCE_STATE s)
{
    S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    switch (s) {
    case NFCE_LOW:
        nand->NFCONT &= ~(1<<1);         break;     case NFCE_HIGH:         nand->NFCONT |= (1<<1);
        break;
    }
}

static inline void NF_Init_ECC(void)
{
    S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    nand->NFCONT |= (1<<4);
}

#else
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_Init_ECC(void)
{
    S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    nand->NFCONF |= (1<<12);
}
#endif

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
#define TACLS 0
#define TWRPH0 3
#define TWRPH1 0
#else
#define TACLS 0
#define TWRPH0 4
#define TWRPH1 2
#endif

#if defined(CONFIG_S3C2440)
    NF_Conf((TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4));     NF_Cont((0<<13)|(0<<12)|(0<<10)|(0<<9)|(0<<8)|(0<<6)|(0<<5)|(1<<4)|(0<<1)|(1<<0)); #else     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 */
#endif
    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
三、因为板子上没有cs8900，只有dm9000ae，所以开始移植dm9000ae
1、修改include/configs/utu2440.h
 
/* Hardware drivers
 */
//#define CONFIG_DRIVER_CS8900    1    /* we have a CS8900 on-board */ //editedby yaoyi 20090314
//#define CS8900_BASE        0x19000300
//#define CS8900_BUS16        1 /* the Linux driver does accesses as shorts */
#define CONFIG_DRIVER_DM9000 1
#define CONFIG_DM9000_BASE 0x18000300
#define DM9000_IO CONFIG_DM9000_BASE
#define DM9000_DATA (CONFIG_DM9000_BASE+4)
#define CONFIG_DM9000_USE_16BIT

2、修改lib_arm/board.c
#ifdef CONFIG_DRIVER_DM9000
extern int eth_init(bd_t * bd);
#endif
#ifdef CONFIG_DRIVER_DM9000
eth_init(gd->bd);
#endif

3、修改utu2440.h,使读出的MAC不出现00：00：00：00：00：00

….
/*#define CONFIG_BOOTARGS       "root=ramfs devfs=mount console=ttySA0,9600" */
#define CONFIG_ETHADDR          08:00:3e:26:0a:5b
#define CONFIG_NETMASK          255.255.255.0
#define CONFIG_IPADDR           192.168.1.110
#define CONFIG_SERVERIP         192.168.1.1
…….
4、修改drivers/net/dm9000x.c,已读取内存区上的MAC，以及不出现cannot establish the link
添加一个函数声明
/* function declaration ------------------------------------- */
int eth_initfirst(bd_t * bd);
int eth_init(bd_t * bd);
int eth_send(volatile void *, int);
int eth_rx(void);
…….
int
eth_init(bd_t* bd)
{
  …..

    /* RESET device */
//      dm9000_reset();
        dm9000_probe();
  …..
        
     /* Set Node address */
/*#ifndef CONFIG_AT91SAM9261EK
        for (i = 0; i < 6; i++)                 ((u16 *) bd->bi_enetaddr)[i] = read_srom_word(i);
#endif*/
//edited by yaoyi 20090317
        if (is_zero_ether_addr(bd->bi_enetaddr) ||
            is_multicast_ether_addr(bd->bi_enetaddr)) {
                /* try reading from environment */
                u8 i;
                puts("ready to read MAC/n");
                char *s, *e;
                s = getenv ("ethaddr");
                for (i = 0; i < 6; ++i) {                         bd->bi_enetaddr[i] = s ?simple_strtoul (s, &e, 16) : 0;
                        if (s)
                                s = (*e) ? e + 1 : e;
                }
        }
…….
#if 0
        i = 0;
        while (!(phy_read(1) & 0x20)) { /* autonegation complete bit */
                udelay(1000);
                i++;
                if (i == 10000) {
                        printf("could not establish link/n");
                        return 0;
                }
        }

        /* see what we've got */
        lnk = phy_read(17) >> 12;
        printf("operating at ");
        switch (lnk) {
        case 1:
                printf("10M half duplex ");
                break;
        case 2:
                printf("10M full duplex ");
                break;
        case 4:
                printf("100M half duplex ");
                break;
        case 8:
                printf("100M full duplex ");
                break;
        default:
                printf("unknown: %d ", lnk);
                break;
        }
        printf("mode/n");
#endif
        return 0;
}
在函数int eth_init()后添加eth_initfirst的定义
int eth_initfirst(bd_t * bd)
{
        dm9000_reset();
        eth_init(bd);
}
最后修改下dm9000_reset如下:
 /* Reset DM9000,
           see DM9000 Application Notes V1.22 Jun 11, 2004 page 29 */

        /* DEBUG: Make all GPIO pins outputs */
//      DM9000_iow(DM9000_GPCR, 0x0F);
        /* Step 1: Power internal PHY by writing 0 to GPIO0 pin */
        DM9000_iow(DM9000_GPR, 0);
        /* Step 2: Software reset */
        DM9000_iow(DM9000_NCR, 3);

三、交叉编译U－Boot。
 这篇文章的移植使用DM9000网卡。Tftp功能是可用的.不过tftp的时候记得关掉selinux，以及iptables