jz2440-uboot-201204版本移植【学习笔记】【原创】

平台:jz2440

作者：庄泽彬(欢迎转载，请注明作者)

说明：韦东山二期视频学习笔记

交叉编译工具:arm-linux-gcc (GCC)4.3.2

PC环境:ubuntu18.04

一、uboot的编译和烧录

下载uboot-2012-04版本的uboot进行移植，下载链接:ftp://ftp.denx.de/pub/u-boot/

编译:

 make smdk2410_config
 make -j4

使用oflash进行烧录,注意要烧录到norflash进行启动，不能烧录到nandflash启动:

 sudo oflash u-boot.bin

使用没有修改的uboo2012-04版本烧录启动肯定不能启动，要进行修改，支持jz2440

 

二、uboot的启动流程

在进行移植之前，我们要先了解uboot的启动流程，才能快速的移植。根据编译过程，看看是那些文件先编译，在uboot启动阶段最先执行.

根据下图编译的log，和链接器脚本可知，arch/arm/cpu/arm920t/start.c 是最先执行的，并且链接地址为0。

根据start.c分析uboot主要内容如下:

2.1  set the cpu to SVC32 mode 设置为管理模式

2.2  turn off the watchdog  关闭看门狗

2.3  mask all IRQs by setting all bits in the INTMR

2.4  设置时钟比例: FCLK:HCLK:PCLK = 1:2:4

2.5  设置内存控制器

2.6 设置栈，调用board_init_f进行初始化

2.6.1 设置栈指针地址sp = 0x30000f80

2.6.2  设置gd变量

DECLARE_GLOBAL_DATA_PTR

#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r8") 

ffixed-r8

指定r8寄存器来存放gd变量的地址

2.7 重定位代码:

为什么要重定位代码呢？norflash的全局变量能像内存一样读，但是不能像内存一样写，从这一点出发也需要把代码进行重定位，重定位之后，还要修改代码，修改里面的变量，函数使用新的地址.

在链接的时候添加pie选项，会把地址信息存放在.rel和dynsym段中。arm-linux-ld -pie

查看链接脚本中也有这两个段:

最终的sdram内存分布如下图:

　　

 三、uboot重定位分析

3.1 从NOR Flash 把代码复制到sdram(源码:u-boot-2012.04.01\arch\arm\cpu\arm920t\start.S)

     /* Set up the stack                            */
 stack_setup:
     mov    sp, r4

     adr    r0, _start
     cmp    r0, r6
     beq    clear_bss        /* skip relocation */
     mov    r1, r6            /* r1 <- scratch for copy_loop */
     ldr    r3, _bss_start_ofs
     add    r2, r0, r3        /* r2 <- source end address        */

 copy_loop:
     ldmia    r0!, {r9-r10}        /* copy from source address [r0]    */
     stmia    r1!, {r9-r10}        /* copy to   target address [r1]    */
     cmp    r0, r2            /* until source end address [r2]    */
     blo    copy_loop

3.2 程序的链接地址是0，访问全局变量、静态变量、调用函数时是基于0地址编译得到的地址,现在把程序复制到了sdram，需要修改代码，把基于0地址编译得到的地址改为新地址

 分析"重定位之修改代码为新地址":
 #ifndef CONFIG_SPL_BUILD
     /*
      * fix .rel.dyn relocations
      */
     ldr    r0, _TEXT_BASE        /* r0 <- Text base */
     // r0=0, 代码基地址

     sub    r9, r6, r0        /* r9 <- relocation offset */
     // r9 = r6-r0 = 0x33f41000 - 0 = 0x33f41000

     ldr    r10, _dynsym_start_ofs    /* r10 <- sym table ofs */
     // r10 = 00073608

     add    r10, r10, r0        /* r10 <- sym table in FLASH */
     // r10 = 00073608 + 0 = 00073608

     ldr    r2, _rel_dyn_start_ofs    /* r2 <- rel dyn start ofs */
     // r2=0006b568

     add    r2, r2, r0        /* r2 <- rel dyn start in FLASH */
     // r2=r2+r0=0006b568

     ldr    r3, _rel_dyn_end_ofs    /* r3 <- rel dyn end ofs */
     // r3=00073608

     add    r3, r3, r0        /* r3 <- rel dyn end in FLASH */
     // r3=r3+r0=00073608

 fixloop:
     ldr    r0, [r2]        /* r0 <- location to fix up, IN FLASH! */
     . r0=[0006b568]=

     add    r0, r0, r9        /* r0 <- location to fix up in RAM */
     . r0=r0+r9= + 0x33f41000 = 0x33f41020

     ldr    r1, [r2, #]
     . r1=[0006b568+]=

     and    r7, r1, #0xff
     . r7=r1&0xff=

     cmp    r7, #            /* relative fixup? */
     . r7 == (0x17)

     beq    fixrel
     cmp    r7, #            /* absolute fixup? */

     beq    fixabs
     /* ignore unknown type of fixup */
     b    fixnext
 fixabs:
     /* absolute fix: set location to (offset) symbol value */
     mov    r1, r1, LSR #        /* r1 <- symbol index in .dynsym */

     add    r1, r10, r1        /* r1 <- address of symbol in table */

     ldr    r1, [r1, #]        /* r1 <- symbol value */

     add    r1, r1, r9        /* r1 <- relocated sym addr */

     b    fixnext
 fixrel:
     /* relative fix: increase location by offset */
     ldr    r1, [r0]
     . r1=[]=000001e0

     add    r1, r1, r9
     . r1=r1+r9=000001e0 + 0x33f41000 = 33F411E0

 fixnext:
     str    r1, [r0]
     . [0x33f41020] = 33F411E0

     add    r2, r2, #        /* each rel.dyn entry is 8 bytes */
     . r2=r2+=0006b568+=6B570

     cmp    r2, r3
     . 

     blo    fixloop
 #endif

3.3 调用clear_bss

3.4 调用C函数board_init_r：第2阶段的代码

四、修改uboot代码--新建单板、修改系统时钟、串口

4.1 新建新的单板

4.2修改系统时钟、支持串口显示:

uboot代码里先以60Mhz时钟计算参数来设置内存控制器，但是还没有设置MPLL

cpu_init_crit
|　　|
|　　lowlevel_init   对内存的初始化，要求HCLK=60Mhz,但是时钟的设置在初始化内存之后，这部分代码有问题需要调整
|
board_init_f
　　　|
　　　init_sequence
　　　    |
         board_early_init_f

/* to reduce PLL lock time, adjust the LOCKTIME register */
           writel(0xFFFFFF, &clk_power->locktime);

/* configure MPLL */
           writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,&clk_power->mpllcon);

使用openjtag调试，根据下面调试的内容可知，无法往sdram写入数据，这部分的初始化需要调整

代码修改如下:

 zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ git diff .
 diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
 index 8c5612c..8655eca
 --- a/arch/arm/cpu/arm920t/start.S
 +++ b/arch/arm/cpu/arm920t/start.S
 @@ -, +, @@ copyex:

         /* FCLK:HCLK:PCLK = 1:2:4 */
         /* default FCLK is 120 MHz ! */
 -       ldr     r0, =CLKDIVN
 -       mov     r1, #
 -       str     r1, [r0]
 +       /* 2. 设置时钟 */
 +       ldr r0, =0x4c000014
 +       //      mov r1, #0x03;                    // FCLK:HCLK:PCLK=1:2:4, HDIVN=1,PDIVN=1
 +       mov r1, #0x05;                    // FCLK:HCLK:PCLK=1:4:8
 +       str r1, [r0]
 +
 +       /* 如果HDIVN非0，CPU的总线模式应该从“fast bus mode”变为“asynchronous bus mode” */
 +       mrc     p15, , r1, c1, c0,            /* 读出控制寄存器 */
 +       orr     r1, r1, #0xc0000000                     /* 设置为“asynchronous bus mode” */
 +       mcr     p15, , r1, c1, c0,            /* 写入控制寄存器 */
 +
 +       #define S3C2440_MPLL_400MHZ     ((0x5c<<12)|(0x01<<4)|(0x01))
 +
 +       /* MPLLCON = S3C2440_MPLL_200MHZ */
 +       ldr r0, =0x4c000004
 +       ldr r1, =S3C2440_MPLL_400MHZ
 +       str r1, [r0]
 +
 +       /* 启动ICACHE */
 +       mrc p15, , r0, c1, c0,        @ read control reg
 +       orr r0, r0, #(<<)
 +       mcr     p15, , r0, c1, c0,    @ write it back
 +
 +
  #endif /* CONFIG_S3C24X0 */

         /*
 diff --git a/board/samsung/smdk2440/lowlevel_init.S b/board/samsung/smdk2440/lowlevel_init.S
 index a2bf570..c14cab3 100644
 --- a/board/samsung/smdk2440/lowlevel_init.S
 +++ b/board/samsung/smdk2440/lowlevel_init.S
 @@ -152,16 +152,16 @@ lowlevel_init:
  /* the literal pools origin */

  SMRDATA:
 -    .word (+(B1_BWSCON<<)+(B2_BWSCON<<)+(B3_BWSCON<<)+(B4_BWSCON<<)+(B5_BWSCON<<)+(B6_BWSCON<<)+(B7_BWSCON<<))
 -    .word ((B0_Tacs<<)+(B0_Tcos<<)+(B0_Tacc<<)+(B0_Tcoh<<)+(B0_Tah<<)+(B0_Tacp<<)+(B0_PMC))
 -    .word ((B1_Tacs<<)+(B1_Tcos<<)+(B1_Tacc<<)+(B1_Tcoh<<)+(B1_Tah<<)+(B1_Tacp<<)+(B1_PMC))
 -    .word ((B2_Tacs<<)+(B2_Tcos<<)+(B2_Tacc<<)+(B2_Tcoh<<)+(B2_Tah<<)+(B2_Tacp<<)+(B2_PMC))
 -    .word ((B3_Tacs<<)+(B3_Tcos<<)+(B3_Tacc<<)+(B3_Tcoh<<)+(B3_Tah<<)+(B3_Tacp<<)+(B3_PMC))
 -    .word ((B4_Tacs<<)+(B4_Tcos<<)+(B4_Tacc<<)+(B4_Tcoh<<)+(B4_Tah<<)+(B4_Tacp<<)+(B4_PMC))
 -    .word ((B5_Tacs<<)+(B5_Tcos<<)+(B5_Tacc<<)+(B5_Tcoh<<)+(B5_Tah<<)+(B5_Tacp<<)+(B5_PMC))
 -    .word ((B6_MT<<)+(B6_Trcd<<)+(B6_SCAN))
 -    .word ((B7_MT<<)+(B7_Trcd<<)+(B7_SCAN))
 -    .word ((REFEN<<)+(TREFMD<<)+(Trp<<)+(Trc<<)+(Tchr<<)+REFCNT)
 -    .word 0x32
 -    .word 0x30
 -    .word 0x30
 +.long 0x22011110        //BWSCON
 +.long 0x00000700        //BANKCON0
 +.long 0x00000700        //BANKCON1
 +.long 0x00000700        //BANKCON2
 +.long 0x00000700        //BANKCON3
 +.long 0x00000700        //BANKCON4
 +.long 0x00000700        //BANKCON5
 +.long 0x00018005        //BANKCON6
 +.long 0x00018005        //BANKCON7
 +.long 0x008C04F4        // REFRESH
 +.long 0x000000B1        //BANKSIZE
 +.long 0x00000030        //MRSRB6
 +.long 0x00000030        //MRSRB7
 diff --git a/board/samsung/smdk2440/smdk2410.c b/board/samsung/smdk2440/smdk2410.c
 index e9ba922..44f38d1
 --- a/board/samsung/smdk2440/smdk2410.c
 +++ b/board/samsung/smdk2440/smdk2410.c
 @@ -, +, @@ int board_early_init_f(void)
         struct s3c24x0_gpio * const gpio = s3c24x0_get_base_gpio();

         /* to reduce PLL lock time, adjust the LOCKTIME register */
 -       writel(0xFFFFFF, &clk_power->locktime);
 +       //writel(0xFFFFFF, &clk_power->locktime);

         /* configure MPLL */
 -       writel((M_MDIV << ) + (M_PDIV << ) + M_SDIV,
 -              &clk_power->mpllcon);
 +       //writel((M_MDIV << 12) + (M_PDIV << 4) + M_SDIV,
 +       //       &clk_power->mpllcon);

         /* some delay between MPLL and UPLL */
         pll_delay();
 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
 index 7d16320..71336c7
 --- a/include/configs/smdk2440.h
 +++ b/include/configs/smdk2440.h
 @@ -, +, @@
   */
  #define CONFIG_ARM920T         /* This is an ARM920T Core */
  #define CONFIG_S3C24X0         /* in a SAMSUNG S3C24x0-type SoC */
 -#define CONFIG_S3C2410         /* specifically a SAMSUNG S3C2410 SoC */
 +//#define CONFIG_S3C2410               /* specifically a SAMSUNG S3C2410 SoC */
 +#define CONFIG_S3C2440         /* specifically a SAMSUNG S3C2410 SoC */
  #define CONFIG_SMDK2410                /* on a SAMSUNG SMDK2410 Board */

  #define CONFIG_SYS_TEXT_BASE   0x0
 @@ -, +, @@
  #define CONFIG_CMD_DATE
  #define CONFIG_CMD_DHCP
  #define CONFIG_CMD_ELF
 -#define CONFIG_CMD_NAND
 +//#define CONFIG_CMD_NAND
  #define CONFIG_CMD_PING
  #define CONFIG_CMD_REGINFO
  #define CONFIG_CMD_USB
 @@ -, +, @@
  #define CONFIG_CMD_MTDPARTS
  #define CONFIG_MTD_DEVICE
  #define CONFIG_MTD_PARTITIONS
 -#define CONFIG_YAFFS2
 +//#define CONFIG_YAFFS2
  #define CONFIG_RBTREE

  /* additions for new relocation code, must be added to all boards */

 编译和烧录查看现在结果，现在串口起码可以输出了啊：

五、支持nandflash启动

　　原来的代码在链接时加了“-pie选项”，使得u-boot.bin里多了rel、dynsym段，这两个段主要是重定位之后修改成新的地址使用的，使用这种方式代码相对会比较大。

5.1 去掉-pie选项，修改如下:

代码修改支持nandflash主要如下:

 zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ git diff .
 diff --git a/arch/arm/config.mk b/arch/arm/config.mk
 index 3c5f987..cca02b3
 --- a/arch/arm/config.mk
 +++ b/arch/arm/config.mk
 @@ -, +, @@ endif

  # needed for relocation
  ifndef CONFIG_NAND_SPL
 -LDFLAGS_u-boot += -pie
 +#LDFLAGS_u-boot += -pie
  endif
 diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
 index 8655eca..34f7da8
 --- a/arch/arm/cpu/arm920t/start.S
 +++ b/arch/arm/cpu/arm920t/start.S
 @@ -, +, @@ copyex:
         bl      cpu_init_crit
  #endif

 -/* Set stackpointer in internal RAM to call board_init_f */
 -call_board_init_f:
         ldr     sp, =(CONFIG_SYS_INIT_SP_ADDR)
         bic     sp, sp, # /* 8-byte alignment for ABI compliance */
 +
 +       bl nand_init_ll
 +       mov r0,#
 +       ldr r1,_TEXT_BASE
 +
 +       ldr r2,_bss_start_ofs
 +
 +       bl copy_code_to_sdram
 +       bl clear_bss
 +
 +       ldr pc,=call_board_init_f
 +
 +/* Set stackpointer in internal RAM to call board_init_f */
 +call_board_init_f:
 +
         ldr     r0,=0x00000000
         bl      board_init_f

 -/*------------------------------------------------------------------------------*/
 -
 -/*
 - * void relocate_code (addr_sp, gd, addr_moni)
 - *
 - * This "function" does not return, instead it continues in RAM
 - * after relocating the monitor code.
 - *
 - */
 -       .globl  relocate_code
 -relocate_code:
 -       mov     r4, r0  /* save addr_sp */
 -       mov     r5, r1  /* save addr of gd */
 -       mov     r6, r2  /* save addr of destination */
 -
 -       /* Set up the stack                                                 */
 -stack_setup:
 -       mov     sp, r4
 -
 -       adr     r0, _start
 -       cmp     r0, r6
 -       beq     clear_bss               /* skip relocation */
 -       mov     r1, r6                  /* r1 <- scratch for copy_loop */
 -       ldr     r3, _bss_start_ofs
 -       add     r2, r0, r3              /* r2 <- source end address         */
 -
 -copy_loop:
 -       ldmia   r0!, {r9-r10}           /* copy from source address [r0]    */
 -       stmia   r1!, {r9-r10}           /* copy to   target address [r1]    */
 -       cmp     r0, r2                  /* until source end address [r2]    */
 -       blo     copy_loop
 -
 -#ifndef CONFIG_SPL_BUILD
 -       /*
 -        * fix .rel.dyn relocations
 -        */
 -       ldr     r0, _TEXT_BASE          /* r0 <- Text base */
 -       sub     r9, r6, r0              /* r9 <- relocation offset */
 -       ldr     r10, _dynsym_start_ofs  /* r10 <- sym table ofs */
 -       add     r10, r10, r0            /* r10 <- sym table in FLASH */
 -       ldr     r2, _rel_dyn_start_ofs  /* r2 <- rel dyn start ofs */
 -       add     r2, r2, r0              /* r2 <- rel dyn start in FLASH */
 -       ldr     r3, _rel_dyn_end_ofs    /* r3 <- rel dyn end ofs */
 -       add     r3, r3, r0              /* r3 <- rel dyn end in FLASH */
 -fixloop:
 -       ldr     r0, [r2]                /* r0 <- location to fix up, IN FLASH! */
 -       add     r0, r0, r9              /* r0 <- location to fix up in RAM */
 -       ldr     r1, [r2, #]
 -       and     r7, r1, #0xff
 -       cmp     r7, #                 /* relative fixup? */
 -       beq     fixrel
 -       cmp     r7, #                  /* absolute fixup? */
 -       beq     fixabs
 -       /* ignore unknown type of fixup */
 -       b       fixnext
 -fixabs:
 -       /* absolute fix: set location to (offset) symbol value */
 -       mov     r1, r1, LSR #          /* r1 <- symbol index in .dynsym */
 -       add     r1, r10, r1             /* r1 <- address of symbol in table */
 -       ldr     r1, [r1, #]            /* r1 <- symbol value */
 -       add     r1, r1, r9              /* r1 <- relocated sym addr */
 -       b       fixnext
 -fixrel:
 -       /* relative fix: increase location by offset */
 -       ldr     r1, [r0]
 -       add     r1, r1, r9
 -fixnext:
 -       str     r1, [r0]
 -       add     r2, r2, #              /* each rel.dyn entry is 8 bytes */
 -       cmp     r2, r3
 -       blo     fixloop
 -#endif
 +       ldr r1,_TEXT_BASE

 -clear_bss:
 -#ifndef CONFIG_SPL_BUILD
 -       ldr     r0, _bss_start_ofs
 -       ldr     r1, _bss_end_ofs
 -       mov     r4, r6                  /* reloc addr */
 -       add     r0, r0, r4
 -       add     r1, r1, r4
 -       mov     r2, #0x00000000         /* clear                            */
 -
 -clbss_l:str    r2, [r0]                /* clear loop...                    */
 -       add     r0, r0, #
 -       cmp     r0, r1
 -       bne     clbss_l
 -
 -       bl coloured_LED_init
 -       bl red_led_on
 -#endif
 +       //second action
 +       bl board_init_r

  /*
   * We are done. Do not return, instead branch to second part of board
 diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds
 index e49ca0c..ba20982 100644
 --- a/arch/arm/cpu/u-boot.lds
 +++ b/arch/arm/cpu/u-boot.lds
 @@ -35,6 +35,7 @@ SECTIONS
         {
                 __image_copy_start = .;
                 CPUDIR/start.o (.text)
 +               board/samsung/smdk2440/libsmdk2440.o (.text)
                 *(.text)
         }

 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
 index 5270c11..afafe7b 100644
 --- a/arch/arm/lib/board.c
 +++ b/arch/arm/lib/board.c
 @@ -256,7 +256,7 @@ init_fnc_t *init_sequence[] = {
         NULL,
  };

 -void board_init_f(ulong bootflag)
 +unsigned int board_init_f(ulong bootflag)
  {
         bd_t *bd;
         init_fnc_t **init_fnc_ptr;
 @@ -369,8 +369,9 @@ void board_init_f(ulong bootflag)
          * reserve memory for U-Boot code, data & bss
          * round down to next 4 kB limit
          */
 -       addr -= gd->mon_len;
 -       addr &= ~( - );
 +       //addr -= gd->mon_len;
 +       //addr &= ~(4096 - 1);
 +       addr = CONFIG_SYS_TEXT_BASE;

         debug("Reserving %ldk for U-Boot at: %08lx\n", gd->mon_len >> , addr);

 @@ -, +, @@ void board_init_f(ulong bootflag)
         debug("relocation Offset is: %08lx\n", gd->reloc_off);
         memcpy(id, (void *)gd, sizeof(gd_t));

 -       relocate_code(addr_sp, id, addr);
 +       //relocate_code(addr_sp, id, addr);

 +       return  (unsigned int )id;
 +
         /* NOTREACHED - relocate_code() does not return */
  }

 diff --git a/board/samsung/smdk2440/Makefile b/board/samsung/smdk2440/Makefile
 index b8657b4..04d36b3
 --- a/board/samsung/smdk2440/Makefile
 +++ b/board/samsung/smdk2440/Makefile
 @@ -, +, @@ include $(TOPDIR)/config.mk

  LIB    = $(obj)lib$(BOARD).o

 -COBJS  := smdk2410.o
 +COBJS  := smdk2410.o init.o
  SOBJS  := lowlevel_init.o

  SRCS   := $(SOBJS:.o=.S) $(COBJS:.o=.c)
 diff --git a/include/common.h b/include/common.h
 index 4b5841e..390ab72
 --- a/include/common.h
 +++ b/include/common.h
 @@ -, +, @@ int abortboot(int bootdelay);
  extern char console_buffer[];

  /* arch/$(ARCH)/lib/board.c */
 -void   board_init_f  (ulong) __attribute__ ((noreturn));
 +unsigned int board_init_f(ulong) ;
  void   board_init_r  (gd_t *, ulong) __attribute__ ((noreturn));
  int    checkboard    (void);
  int    checkflash    (void);
 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
 index 71336c7..b638eb4
 --- a/include/configs/smdk2440.h
 +++ b/include/configs/smdk2440.h
 @@ -, +, @@
  #define CONFIG_S3C2440         /* specifically a SAMSUNG S3C2410 SoC */
  #define CONFIG_SMDK2410                /* on a SAMSUNG SMDK2410 Board */

 -#define CONFIG_SYS_TEXT_BASE   0x0
 +#define CONFIG_SYS_TEXT_BASE   0x33f00000

  #define CONFIG_SYS_ARM_CACHE_WRITETHROUGH

 zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ 

添加了一个文件：board/samsung/smdk2440/init.c这里封装了nandflash初始化等操作，nand_init_ll、copy_code_to_sdram，由于我们在start.S文件中重定位了代码，因此不需要在arch/arm/lib/board.c中要去掉重定位的操作relocate_code。

这个值CONFIG_SYS_TEXT_BASE为什么要设置为0x33f00000,这个值是程序链接的大小,bin文件的大小只有300多k,但是没有包含bss等段，

反汇编查看文件的大小：0x00094b40的十进制是600多k,因此设置的CONFIG_SYS_TEXT_BASE我们设置为1M(设置大一点比较安全),我们的sdram的末端地址为0x34000000,0x3400000-0x33f00000=1M

 arm-linux-objdump -D u-boot > u-boot.dis

编译烧录，开发板设置为nandflash启动，根据下图nandflash启动还是可以输出之前的log，设置成nandflash启动的代码修改暂时没有问题，其余的bug后续修复.

 六、支持norflash：

首先我们来看看代码为什么会打印     Flash:*** failed ***，norflash会调用这个进行初始化flash_init，如果初始化失败，则会卡在hang中无法执行,我们打开了调试信息之后，其实是识别出来norflash的，但是为什么会初始化失败是由于jedec_table这个数组没有添加我们norflash的型号导致的。

Board.c (arch\arm\lib)

flash_init

　　　　　　flash_detect_legacy

　　　　　　　　jedec_flash_match

　　　　　　　　　　jedec_table    //根据这个数组匹配有没有相应的norflash型号

|
|success
|------
|
|failed
|-----puts(failed);
|   
|-----hang();norflash初始化失败则会卡在这里

代码修改如下:

 zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ git diff .
 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
 index afafe7b..b8c17ae
 --- a/arch/arm/lib/board.c
 +++ b/arch/arm/lib/board.c
 @@ -, +, @@ void board_init_r(gd_t *id, ulong dest_addr)
                 print_size(flash_size, "\n");
  # endif /* CONFIG_SYS_FLASH_CHECKSUM */
         } else {
 -               puts(failed);
 -               hang();
 +               puts("0 KB\r\n");
 +               //puts(failed);
 +               //hang();
         }
  #endif

 diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
 index 35294bc..295003e
 --- a/drivers/mtd/cfi_flash.c
 +++ b/drivers/mtd/cfi_flash.c
 @@ -, +, @@
  #include <mtd/cfi_flash.h>
  #include <watchdog.h>

 +//#define DEBUG   1
 +//#define _DEBUG 1
 +
  /*
   * This file implements a Common Flash Interface (CFI) driver for
   * U-Boot.
 diff --git a/drivers/mtd/jedec_flash.c b/drivers/mtd/jedec_flash.c
 index 2350f36..4037ec2 100644
 --- a/drivers/mtd/jedec_flash.c
 +++ b/drivers/mtd/jedec_flash.c
 @@ -367,6 +367,24 @@ static const struct amd_flash_info jedec_table[] = {
                 }
         },
  #endif
 +       {
 +               .mfr_id         = (u16)MX_MANUFACT,
 +               .dev_id         = 0x2249,
 +               .name           = "MXIC MT29LV160DB",
 +               .uaddr          = {
 +                       [1] = MTD_UADDR_0x0555_0x02AA /* x16 */
 +               },
 +               .DevSize        = SIZE_2MiB,
 +               .CmdSet         = P_ID_AMD_STD,
 +               .NumEraseRegions= ,
 +               .regions        = {
 +                       ERASEINFO(*, ),
 +                       ERASEINFO(*, ),
 +                       ERASEINFO(*, ),
 +                       ERASEINFO(*, ),
 +               }
 +       },
 +
  };

  static inline void fill_info(flash_info_t *info, const struct amd_flash_info *jedec_entry, ulong base)
 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
 index b638eb4..
 --- a/include/configs/smdk2440.h
 +++ b/include/configs/smdk2440.h
 @@ -, +, @@

  #define CONFIG_SYS_MAX_FLASH_BANKS     1
  #define CONFIG_SYS_FLASH_BANKS_LIST     { CONFIG_SYS_FLASH_BASE }
 -#define CONFIG_SYS_MAX_FLASH_SECT      (19)
 +#define CONFIG_SYS_MAX_FLASH_SECT      (128)

  #define CONFIG_ENV_ADDR                        (CONFIG_SYS_FLASH_BASE + 0x070000)
  #define CONFIG_ENV_IS_IN_FLASH
 zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ 

按照上述方式进行修改,编译烧录现象如下,起码norflash初始化不会报错:

在uboot中进行norflash的读写实验，从下图可以看出norflash进行读写的实验基本没有问题，但是在0x3000000会有点问题：

由于之前在第一阶段的时候讲sp设置到了0x30000000,因此在调用函数的时候30000000的数据会变化，我们在第一阶段的时候sp已经重新定义了位置，在第二阶段的时候没有修改sp的指向，因此这里需要重新设置sp的地址：

修改代码如下:

 diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
 index 34f7da8..a1876a5
 --- a/arch/arm/cpu/arm920t/start.S
 +++ b/arch/arm/cpu/arm920t/start.S
 @@ -, +, @@ FIQ_STACK_START:
  IRQ_STACK_START_IN:
         .word   0x0badc0de

 +.globl base_sp
 +base_sp:
 +       .long
 +
 +
  /*
   * the actual start code
   */
 @@ -, +, @@ call_board_init_f:
         bl      board_init_f

         ldr r1,_TEXT_BASE
 -
 +
 +       ldr sp,=base_sp
 +
         //second action
         bl board_init_r

 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
 index afafe7b..6cd7352
 --- a/arch/arm/lib/board.c
 +++ b/arch/arm/lib/board.c
 @@ -, +, @@ unsigned int board_init_f(ulong bootflag)
         init_fnc_t **init_fnc_ptr;
         gd_t *id;
         ulong addr, addr_sp;
 +       extern ulong base_sp;
  #ifdef CONFIG_PRAM
         ulong reg;
  #endif
 @@ -, +, @@ unsigned int board_init_f(ulong bootflag)
         debug("relocation Offset is: %08lx\n", gd->reloc_off);
         memcpy(id, (void *)gd, sizeof(gd_t));

 +       base_sp = addr_sp;
 +
         //relocate_code(addr_sp, id, addr);
  

重新进行norflash的读写实验，在0x3000000读写没有问题.

 七、支持nandflash操作：

修改代码如下：

 diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
 index 1d1b628..
 --- a/drivers/mtd/nand/Makefile
 +++ b/drivers/mtd/nand/Makefile
 @@ -, +, @@ COBJS-$(CONFIG_NAND_MXS) += mxs_nand.o
  COBJS-$(CONFIG_NAND_NDFC) += ndfc.o
  COBJS-$(CONFIG_NAND_NOMADIK) += nomadik.o
  COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o
 +COBJS-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o
  COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
  COBJS-$(CONFIG_NAND_SPEAR) += spr_nand.o
  COBJS-$(CONFIG_NAND_OMAP_GPMC) += omap_gpmc.o
 diff --git a/drivers/mtd/nand/s3c2440_nand.c b/drivers/mtd/nand/s3c2440_nand.c
 index e1a459b..a0c8876
 --- a/drivers/mtd/nand/s3c2440_nand.c
 +++ b/drivers/mtd/nand/s3c2440_nand.c
 @@ -, +, @@ static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
  }
  #endif

 -static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 +static void s3c2440_hwcontrol(struct mtd_info *mtd, int dat, unsigned int ctrl)
  {
         struct nand_chip *chip = mtd->priv;
 -       struct s3c2410_nand *nand = s3c2410_get_base_nand();
 -
 -       debug("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);
 -
 -       if (ctrl & NAND_CTRL_CHANGE) {
 -               ulong IO_ADDR_W = (ulong)nand;
 -
 -               if (!(ctrl & NAND_CLE))
 -                       IO_ADDR_W |= S3C2410_ADDR_NCLE;
 -               if (!(ctrl & NAND_ALE))
 -                       IO_ADDR_W |= S3C2410_ADDR_NALE;
 +       struct s3c2440_nand *nand = s3c2440_get_base_nand();

 -               chip->IO_ADDR_W = (void *)IO_ADDR_W;
 -
 -               if (ctrl & NAND_NCE)
 -                       writel(readl(&nand->nfconf) & ~S3C2410_NFCONF_nFCE,
 -                              &nand->nfconf);
 -               else
 -                       writel(readl(&nand->nfconf) | S3C2410_NFCONF_nFCE,
 -                              &nand->nfconf);
 +       if (ctrl &NAND_CLE){
 +               writeb(dat,&nand->nfcmd);
 +       }else if (ctrl &NAND_ALE){
 +               writeb(dat,&nand->nfaddr);
         }
 -
 -       if (cmd != NAND_CMD_NONE)
 -               writeb(cmd, chip->IO_ADDR_W);
  }

 -static int s3c2410_dev_ready(struct mtd_info *mtd)
 +static int s3c2440_dev_ready(struct mtd_info *mtd)
  {
 -       struct s3c2410_nand *nand = s3c2410_get_base_nand();
 +       struct s3c2440_nand *nand = s3c2440_get_base_nand();
         debug("dev_ready\n");
         return readl(&nand->nfstat) & 0x01;
  }

 +static void s3c2440_nand_select(struct mtd_info *mtd, int chipnr)
 +{
 +       struct s3c2440_nand *nand = s3c2440_get_base_nand();
 +
 +       switch (chipnr) {
 +       case -:
 +               nand->nfcont |= (<<);
 +               break;
 +       case :
 +               nand->nfcont &= ~(<<);
 +               break;
 +
 +       default:
 +               BUG();
 +       }
 +}
 +
 +
  #ifdef CONFIG_S3C2410_NAND_HWECC
  void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
  {
 -       struct s3c2410_nand *nand = s3c2410_get_base_nand();
 +       struct s3c2440_nand *nand = s3c2440_get_base_nand();
         debug("s3c2410_nand_enable_hwecc(%p, %d)\n", mtd, mode);
         writel(readl(&nand->nfconf) | S3C2410_NFCONF_INITECC, &nand->nfconf);
  }
 @@ -, +, @@ 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 s3c2410_nand *nand_reg = s3c2410_get_base_nand();
 +       struct s3c2440_nand *nand_reg = s3c2440_get_base_nand();

         debug("board_nand_init()\n");

 @@ -, +, @@ int board_nand_init(struct nand_chip *nand)
         twrph1 = ;
  #endif

 -       cfg = S3C2410_NFCONF_EN;
 -       cfg |= S3C2410_NFCONF_TACLS(tacls - );
 -       cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - );
 -       cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - );
 +       //cfg = S3C2410_NFCONF_EN;
 +       //cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
 +       //cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
 +       //cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
 +       cfg = ((tacls-)<<)|((twrph0-)<<)|((twrph1-)<<);
         writel(cfg, &nand_reg->nfconf);

 +       writel((<<)|(<<)|(<<), &nand_reg->nfcont);
 +
         /* initialize nand_chip data structure */
         nand->IO_ADDR_R = (void *)&nand_reg->nfdata;
         nand->IO_ADDR_W = (void *)&nand_reg->nfdata;

 -       nand->select_chip = NULL;
 +       nand->select_chip = s3c2440_nand_select;

         /* read_buf and write_buf are default */
         /* read_byte and write_byte are default */
 @@ -, +, @@ int board_nand_init(struct nand_chip *nand)
  #endif

         /* hwcontrol always must be implemented */
 -       nand->cmd_ctrl = s3c2410_hwcontrol;
 +       nand->cmd_ctrl = s3c2440_hwcontrol;

 -       nand->dev_ready = s3c2410_dev_ready;
 +       nand->dev_ready = s3c2440_dev_ready;

  #ifdef CONFIG_S3C2410_NAND_HWECC
         nand->ecc.hwctl = s3c2410_nand_enable_hwecc;
 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
 index ..6f5710d
 --- a/include/configs/smdk2440.h
 +++ b/include/configs/smdk2440.h
 @@ -, +, @@
  #define CONFIG_CMD_DATE
  #define CONFIG_CMD_DHCP
  #define CONFIG_CMD_ELF
 -//#define CONFIG_CMD_NAND
 +#define CONFIG_CMD_NAND
  #define CONFIG_CMD_PING
  #define CONFIG_CMD_REGINFO
  #define CONFIG_CMD_USB
 @@ -, +, @@
   * NAND configuration
   */
  #ifdef CONFIG_CMD_NAND
 +
 +#ifdef CONFIG_S3C2410
  #define CONFIG_NAND_S3C2410
  #define CONFIG_SYS_S3C2410_NAND_HWECC
 +#else
 +#define CONFIG_NAND_S3C2440
 +#define CONFIG_SYS_S3C2440_NAND_HWECC
 +#endif
  #define CONFIG_SYS_MAX_NAND_DEVICE     1
  #define CONFIG_SYS_NAND_BASE           0x4E000000
  #endif

使用loady进行烧录,现在串口输入loady 30000000,之后按ctrl+A，之后按s,选择ymodel，选择文件即可使用loady进行烧录

烧录到Norflash

烧录到nandflash：

　　

启动，识别到nandflash：

八、支持DM9000:

根据下图可知uboot支持的是cs8900网卡，我们使用的是DM9000网卡，因此需要把dm9000编译进uboot而不是cs8900,在配置文件添加这个宏CONFIG_DRIVER_DM9000

根据下面的原理图可知DM9000是使用nGCS4作为片选引脚,内存的基地址要设置为0x2000_0000 ，

代码修改如下，BANKCON4用于修改DM9000的时序:

zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ git diff .
diff --git a/board/samsung/smdk2440/lowlevel_init.S b/board/samsung/smdk2440/lowlevel_init.S
index c14cab3..0adf662
--- a/board/samsung/smdk2440/lowlevel_init.S
+++ b/board/samsung/smdk2440/lowlevel_init.S
@@ -, +, @@ SMRDATA:
 .long 0x00000700        //BANKCON1
 .long 0x00000700        //BANKCON2
 .long 0x00000700        //BANKCON3
-.long 0x00000700        //BANKCON4
+.long 0x00000740        //BANKCON4
 .long 0x00000700        //BANKCON5
 .long 0x00018005        //BANKCON6
 .long 0x00018005        //BANKCON7
diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
index 6f5710d..780adb7
--- a/include/configs/smdk2440.h
+++ b/include/configs/smdk2440.h
@@ -, +, @@
 /*
  * Hardware drivers
  */
+ # if
 #define CONFIG_CS8900          /* we have a CS8900 on-board */
 #define CONFIG_CS8900_BASE     0x19000300
 #define CONFIG_CS8900_BUS16    /* the Linux driver does accesses as shorts */
+#else
+#define CONFIG_DRIVER_DM9000
+#define CONFIG_DM9000_BASE             0x20000000
+#define DM9000_IO                      CONFIG_DM9000_BASE
+#define DM9000_DATA                    (CONFIG_DM9000_BASE + 4)

+#endif
 /*
  * select serial console configuration
  */

编译烧录：现象如下,显示没有找到网卡:

在uboot里网卡初始化流程如下,由于没有修改成DM9000的初始化导致的:

puts("Net: ");
eth_initialize(gd->bd);

　　　　|

　　　　int board_eth_init(bd_t *bis)
　　　　{
　　　　　　int rc = 0;
　　　　　　#ifdef CONFIG_CS8900
　　　　　　rc = cs8900_initialize(0, CONFIG_CS8900_BASE);
　　　　　　#endif
　　　　　　return rc;
　　　　}
　　　　#endif

代码修改如下:

 diff --git a/board/samsung/smdk2440/smdk2410.c b/board/samsung/smdk2440/smdk2410.c
 index 44f38d1..b56f8aa
 --- a/board/samsung/smdk2440/smdk2410.c
 +++ b/board/samsung/smdk2440/smdk2410.c
 @@ -, +, @@ int board_eth_init(bd_t *bis)
  #ifdef CONFIG_CS8900
         rc = cs8900_initialize(, CONFIG_CS8900_BASE);
  #endif
 +
 +#ifdef CONFIG_DRIVER_DM9000
 +       rc = dm9000_initialize(bis);
 +#endif
 +
         return rc;
  }
  #endif

编译烧录现象如下，识别到DM9000,并且ping成功:

使用tftp下载：

安装相关的软件

 apt-get install tftp-hpa tftpd-hpa xinetd 

修改配置文件:

sudo vim /etc/default/tftpd-hpa

# /etc/default/tftpd-hpa

TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/tftpboot"
TFTP_ADDRESS=":69"
TFTP_OPTIONS="--secure"

创建tftp的目录

 sudo mkdir /tftpboot
 sudo chmod  /tftpboot

使用tftp下载内核实验如下,成功下载内核，因此uboot对应dm9000的修改暂时没有问题:

九、修改默认参数以及裁剪uboot

代码修改如下：

 zhuang@zhuang:~/project/-jz2440/systems/u-boot-2012.04.$ git diff .
 diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
 index 6cd7352..634f4c8
 --- a/arch/arm/lib/board.c
 +++ b/arch/arm/lib/board.c
 @@ -, +, @@ void board_init_r(gd_t *id, ulong dest_addr)
         }
  #endif

 +       //mtdparts_init();
 +       run_command("mtdparts default",);      //在执行mtdpart之前需要运行mtdparts default 进行初始化设置
 +
         /* main_loop() can return to retry autoboot, if so just run it again. */
         for (;;) {
                 main_loop();
 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
 index bb3f227..709071d
 --- a/include/configs/smdk2440.h
 +++ b/include/configs/smdk2440.h
 @@ -, +, @@
  /************************************************************
   * USB support (currently only works with D-cache off)
   ************************************************************/
 -#define CONFIG_USB_OHCI
 -#define CONFIG_USB_KEYBOARD
 -#define CONFIG_USB_STORAGE
 -#define CONFIG_DOS_PARTITION
 +//#define CONFIG_USB_OHCI                           //裁剪没有用到的模块
 +//#define CONFIG_USB_KEYBOARD
 +//#define CONFIG_USB_STORAGE
 +//#define CONFIG_DOS_PARTITION

  /************************************************************
   * RTC
   ************************************************************/
 -#define CONFIG_RTC_S3C24X0
 +//#define CONFIG_RTC_S3C24X0

  #define CONFIG_BAUDRATE                115200
 @@ -, +, @@
  /*
   * BOOTP options
   */
 -#define CONFIG_BOOTP_BOOTFILESIZE
 -#define CONFIG_BOOTP_BOOTPATH
 -#define CONFIG_BOOTP_GATEWAY
 -#define CONFIG_BOOTP_HOSTNAME
 +//#define CONFIG_BOOTP_BOOTFILESIZE
 +//#define CONFIG_BOOTP_BOOTPATH
 +//#define CONFIG_BOOTP_GATEWAY
 +//#define CONFIG_BOOTP_HOSTNAME

  /*
   * Command line configuration.
 @@ -103,13 +103,13 @@

  #define CONFIG_CMD_BSP
  #define CONFIG_CMD_CACHE
 -#define CONFIG_CMD_DATE
 -#define CONFIG_CMD_DHCP
 +//#define CONFIG_CMD_DATE
 +//#define CONFIG_CMD_DHCP
  #define CONFIG_CMD_ELF
  #define CONFIG_CMD_NAND
  #define CONFIG_CMD_PING
  #define CONFIG_CMD_REGINFO
 -#define CONFIG_CMD_USB
 +//#define CONFIG_CMD_USB

  #define CONFIG_SYS_HUSH_PARSER
  #define CONFIG_SYS_PROMPT_HUSH_PS2     "> "
 @@ -162,7 +162,7 @@

  #define CONFIG_BOOTARGS "console=ttySAC0 root=/dev/mtdblock3"
 -#define CONFIG_BOOTCOMMAND "nand read 30000000 0xabc 0x200000;bootm 30000000"
 +#define CONFIG_BOOTCOMMAND "nand read 30000000 kernel 0x200000;bootm 30000000"
  #define CONFIG_ETHADDR "00:06:3b:01:41:55"
  /*-----------------------------------------------------------------------
   * Stack sizes
 @@ -200,11 +200,28 @@
  #define CONFIG_SYS_FLASH_BANKS_LIST     { CONFIG_SYS_FLASH_BASE }
  #define CONFIG_SYS_MAX_FLASH_SECT      (128)

 +#if 0
  #define CONFIG_ENV_ADDR                        (CONFIG_SYS_FLASH_BASE + 0x070000)
  #define CONFIG_ENV_IS_IN_FLASH
  #define CONFIG_ENV_SIZE                        0x10000
  /* allow to overwrite serial and ethaddr */
  #define CONFIG_ENV_OVERWRITE
 +#endif
 +
 +#define CONFIG_ENV_IS_IN_NAND
 +#define CONFIG_ENV_OFFSET   0x00040000      //设置params分区存放的大小和便宜
 +#define CONFIG_ENV_SIZE          0x20000   /* nand blcok size */
 +#define CONFIG_ENV_RANGE     CONFIG_ENV_SIZE
 +
 +#define CONFIG_CMD_MTDPARTS
 +#define CONFIG_MTD_DEVICE
 +#define MTDIDS_DEFAULT         "nand0=jz2440-0"   // which device
 +                               //mtdparts 命令对nandflash的划分
 +#define MTDPARTS_DEFAULT       "mtdparts=jz2440-0:256k(u-boot),"       \
 +                                               "128k(params),"         \
 +                                               "2m(kernel),"   \
 +                                               "-(rootfs)"
 +

  /*
   * Size of malloc() pool
 @@ -234,6 +251,7 @@
  /*
   * File system
   */
 + #if 0
  #define CONFIG_CMD_FAT
  #define CONFIG_CMD_EXT2
  #define CONFIG_CMD_UBI
 @@ -, +, @@
  #define CONFIG_CMD_MTDPARTS
  #define CONFIG_MTD_DEVICE
  #define CONFIG_MTD_PARTITIONS
 -//#define CONFIG_YAFFS2
 +#define CONFIG_YAFFS2
  #define CONFIG_RBTREE
 -
 +#endif
  /* additions for new relocation code, must be added to all boards */
  #define CONFIG_SYS_SDRAM_BASE  PHYS_SDRAM_1
  #define CONFIG_SYS_INIT_SP_ADDR        (CONFIG_SYS_SDRAM_BASE + 0x1000 - \

设置默认的环境变量修改文件include/configs/smdk2440.h

  /*
   * select serial console configuration
   */
 @@ -, +, @@
  #define CONFIG_ZERO_BOOTDELAY_CHECK

  #define CONFIG_NETMASK         255.255.255.0
 -#define CONFIG_IPADDR          10.0.0.110
 -#define CONFIG_SERVERIP        10.0.0.1
 +#define CONFIG_IPADDR          192.168.1.17
 +#define CONFIG_SERVERIP        192.168.1.100

  #if defined(CONFIG_CMD_KGDB)
  #define CONFIG_KGDB_BAUDRATE   115200  /* speed to run kgdb serial port */
 @@ -, +, @@
  #define CONFIG_LZO
  #define CONFIG_LZMA

 +
 +#define CONFIG_BOOTARGS "console=ttySAC0 root=/dev/mtdblock3"
 +#define CONFIG_BOOTCOMMAND "nand read 30000000 0xabc 0x200000;bootm 30000000"
 +#define CONFIG_ETHADDR "00:06:3b:01:41:55"
  /*-----------------------------------------------------------------------

编译烧录，设置默认的环境变量生效:

tftp下载uboot到sdram，解除写保护，擦除分区，从内存拷贝到norflash。

下载内核到nandflash

从nandflash读到sdram并启动

支持mtdpart命令:

 利用分区名进行烧录，擦除等操作

十、uboot支持jffs2文件系统烧录,默认支持jffs2文件系统烧录

支持yaffs2文件系统,代码修改如下:

 diff --git a/drivers/mtd/nand/nand_util.c b/drivers/mtd/nand/nand_util.c
 old mode
 new mode
 index 60c778e..f9c4a88
 --- a/drivers/mtd/nand/nand_util.c
 +++ b/drivers/mtd/nand/nand_util.c
 @@ -, +, @@ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
                 return -EINVAL;
         }

 -       if (!need_skip && !(flags & WITH_DROP_FFS)) {
 +       if (!need_skip && !(flags & WITH_DROP_FFS) && !(flags & WITH_YAFFS_OOB)) {
                 rval = nand_write (nand, offset, length, buffer);
                 if (rval == )
                         return ;
 @@ -, +, @@ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,

                         ops.len = pagesize;
                         ops.ooblen = nand->oobsize;
 -                       ops.mode = MTD_OOB_AUTO;
 +                       ops.mode = MTD_OOB_RAW;
                         ops.ooboffs = ;

                         pages = write_size / pagesize_oob;
 @@ -, +, @@ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
                                 ops.oobbuf = ops.datbuf + pagesize;

                                 rval = nand->write_oob(nand, offset, &ops);
 -                               if (!rval)
 +                               if (rval)
                                         break;

                                 offset += pagesize;
 diff --git a/include/configs/smdk2440.h b/include/configs/smdk2440.h
 index 709071d..dc25330
 --- a/include/configs/smdk2440.h
 +++ b/include/configs/smdk2440.h
 @@ -, +, @@
  #define CONFIG_LZO
  #define CONFIG_LZMA

 -
 +#define CONFIG_CMD_NAND_YAFFS
  #define CONFIG_BOOTARGS "console=ttySAC0 root=/dev/mtdblock3"
  #define CONFIG_BOOTCOMMAND "nand read 30000000 kernel 0x200000;bootm 30000000"
  #define CONFIG_ETHADDR "00:06:3b:01:41:55"

更新uboot

 烧录yaffs文件系统

 使用yaffs文件系统启动Ok