移植U－Boot.1.2.0到博创2410－S（S3C2410A） 转

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) $(@:_config=) arm arm920t smdk2410 NULL s3c24x0tekkaman2410_config    :    unconfig
        @$(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   nand1nand2:
  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_readbad_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_nextnotmatch:
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
#endifint 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 http://sources.redhat.com/ecos/ecos-license/ */改为：
 at http://sources.redhat.com/ecos/ecos-license/ 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。。。本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/hongjiujing/archive/2007/09/19/1790834.aspx