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基于s3c6410的u-boot 2010.3版本的移植(二)

分类： LINUX

2015-06-08 21:46:42

        之前编译出来的二进制，能用nandflash加载吗？不能，是吧，这就对啦。为什么不能呢？因为，代码中没有加从nandflash启动所需要的代码。因此，这就是我们今天码字的由来。
       1.先修改cpu/arm1176/start.S文件，修改代码如下：

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  1. #ifndef CONFIG_NAND_SPL
  2.     /*
  3.      * flush v4 I/D caches
  4.      */
  5.     mov r0, #0
  6.     mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
  7.     mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */

  9.     /*
  10.      * disable MMU stuff and caches
  11.      */
  12.     mrc p15, 0, r0, c1, c0, 0
  13.     bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
  14.     bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
  15.     orr r0, r0, #0x00000002 @ set bit 2 (A) Align
  16.     orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
  17.     /* Prepare to disable the MMU */
  18.     adr r1, mmu_disable_phys
  19.     /* We presume we're within the first 1024 bytes */
  20.     and r1, r1, #0x3fc
  21.     ldr r2, _TEXT_PHY_BASE
  22.     ldr r3, =0xfff00000
  23.     and r2, r2, r3
  24.     orr r2, r2, r1
  25.     b mmu_disable

  27.     .align 5
  28.     /* Run in a single cache-line */
  29. mmu_disable:
  30.     mcr p15, 0, r0, c1, c0, 0
  31.     nop
  32.     nop
  33.     mov pc, r2
  34. #endif
更改为：

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  1. #ifndef CONFIG_NAND_SPL
  2.     /*
  3.      * flush v4 I/D caches
  4.      */
  5.     mov r0, #0
  6.     mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
  7.     mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */

  9.     /*
  10.      * disable MMU stuff and caches
  11.      */
  12.     mrc p15, 0, r0, c1, c0, 0
  13.     bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
  14.     bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
  15.     orr r0, r0, #0x00000002 @ set bit 2 (A) Align
  16.     orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
  17. #if 0
  18.     /* Prepare to disable the MMU */
  19.     adr r1, mmu_disable_phys
  20.     /* We presume we're within the first 1024 bytes */
  21.     and r1, r1, #0x3fc
  22.     ldr r2, _TEXT_PHY_BASE
  23.     ldr r3, =0xfff00000
  24.     and r2, r2, r3
  25.     orr r2, r2, r1
  26.     b mmu_disable

  28.     .align 5
  29.     /* Run in a single cache-line */
  30. mmu_disable:
  31.     mcr p15, 0, r0, c1, c0, 0
  32.     nop
  33.     nop
  34.     mov pc, r2
  35. #endif
  36. #endif
找到lowlevel_init在其下面添加如下代码：

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  1. bl lowlevel_init /* go setup pll,mux,memory */
  2. /*
  3.  * When we already run in ram, we don't need to relocate U-Boot
  4.  * and actually, memory controller mest to configured before U-Boot
  5.  * is running in ram.
  6.  */
  7.     ldr r0, =0xff000fff
  8.     bic r1, pc, r0 /*r0 <- current base addr of code*/
  9.     ldr r2, _TEXT_BASE /*r1 <- original base addr in ram*/
  10.     bic r2, r2 ,r0 /*ro <- current base addr of code*/
  11.     cmp r1, r2 /*compare r1 , r2*/
  12.     beq after_copy /* if r1 == r2 then skip flash copy*/

  14. #ifdef CONFIG_BOOT_NAND
  15.     mov r0, #0x1000
  16.     bl copy_from_nand
  17. #endif
简述一下：
bic是位清除指令：就是r0中的值取反与pc值相与存入r1,且r1值为0；此时，_TEXT_BASE的值不是0x57e00000就是0xc7e00000；那么执行完bic r2, r2, r0之后r2就为0x00e00000;然后比较r1,r2如果相等则跳转到after_copy;很显然不相等，执行下面的函数copy_from_nand;这个就是从nandflash中拷贝到内存的函数。

在

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  1. #ifdef CONFIG_ENABLE_MMU
  2. _mmu_table_base:
  3.     .word mmu_table
  4. #endif
上面这些代码的下面加上如下代码：

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  1. #ifndef CONFIG_NAND_SPL
  2. /*
  3.  * we assume that cache operation is done before. (eg. cleanup_before_linux())
  4.  * actually, we don't need to do anything about cache if not use d-cache in
  5.  * U-Boot. So, in this function we clean only MMU. by scsuh
  6.  *
  7.  * void theLastJump(void *kernel, int arch_num, uint boot_params);
  8.  */
  9.  /*
  10.  * copy U-Boot to SDRAM and jump to ram (from NAND or OneNAND)
  11.  * r0: size to be compared
  12.  * Load 1'st 2blocks to RAM because U-boot's size is larger than 1block(128k) size
  13.  */
  14.  .globl copy_from_nand
  15.  copy_from_nand:
  16.     mov r10, lr /* save return address */
  17.     mov r9, r0
  18.  /* get ready to call C functions */
  19.     ldr sp, _TEXT_PHY_BASE /* setup temp stack pointer */
  20.     sub sp, sp, #12
  21.     mov fp, #0 /* no previous frame, so fp=0 */
  22.     mov r9, #0x1000
  23.     bl copy_uboot_to_ram
  24.  3: tst r0, #0x0
  25.     bne copy_failed
  26.     ldr r0, =0x0c000000
  27.     ldr r1, _TEXT_PHY_BASE
  28.  1: ldr r3, [r0], #4
  29.     ldr r4, [r1], #4
  30.     teq r3, r4
  31.     bne compare_failed /* not matched */
  32.     subs r9, r9, #4
  33.     bne 1b
  34.  4: mov lr, r10 /* all is OK */
  35.     mov pc, lr
  36.     copy_failed:
  37.     nop /* copy from nand failed */
  38.     b copy_failed
  39. compare_failed:
  40.     nop /* compare failed */
  41.     b compare_failed
2.在cpu/arm1176/目录下面添加文件nand_cp.c。文件内容如下：

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  1. #include <common.h>

  3. #ifdef CONFIG_S3C64XX
  4. #include <asm/io.h>
  5. #include <linux/mtd/nand.h>
  6. #include <asm/arch/s3c6410.h>

  8. static int nandll_read_page(uchar *buf, ulong addr, int large_block)
  9. {
  10.     int i;
  11.     int page_size = 512;

  13.     if (large_block == 1)
  14.     {
  15.         page_size = 2048;
  16.     }

  18.     if(large_block == 2)
  19.     {
  20.         page_size = 4096;
  21.     }

  23.     NAND_ENABLE_CE();
  24.     NFCMD_REG = NAND_CMD_READ0;
  25.     NFADDR_REG = 0; /*Write address*/

  27.     if(large_block)
  28.     {
  29.         NFADDR_REG = 0;
  30.     }

  32.     NFADDR_REG = addr & 0xff;
  33.     NFADDR_REG = (addr >> 8) & 0xff;
  34.     NFADDR_REG = (addr >> 16) & 0xff;
  35.     if (large_block)
  36.     {
  37.         NFCMD_REG = NAND_CMD_READSTART;
  38.     }
  39.     NF_TRANSRnB();
  40.     for(i=0; i < page_size; i++)
  41.     {
  42.         *buf++ = NFDATA8_REG;
  43.     }
  44.     NAND_DISABLE_CE();
  45.     return 0;
  46. }
  47. static int nandll_read_blocks (ulong dst_addr, ulong size, int large_block)
  48. {
  49.     uchar *buf = (uchar *)dst_addr;
  50.     int i;
  51.     uint page_shift = 9;
  52.     if (large_block==1)
  53.         page_shift = 11;
  54.         /* Read pages */
  55.     if(large_block==2)
  56.         page_shift = 12;
  57.     if(large_block == 2)
  58.     {
  59.         /* Read pages */
  60.         for (i = 0; i < 4; i++, buf+=(1<<(page_shift-1)))
  61.         {
  62.             nandll_read_page(buf, i, large_block);
  63.         }
  64.         /* Read pages */
  65.         for (i = 4; i < (0x3c000>>page_shift); i++, buf+=(1<<page_shift))
  66.         {
  67.             nandll_read_page(buf, i, large_block);
  68.         }
  69.     }
  70.     else
  71.     {
  72.         for (i = 0; i < (0x3c000>>page_shift); i++, buf+=(1<<page_shift))
  73.         {
  74.             nandll_read_page(buf, i, large_block);
  75.         }

  77.     }
  78.     return 0;
  79. }
  80. int copy_uboot_to_ram(void)
  81. {
  82.     int large_block = 0;
  83.     int i;
  84.     vu_char id;

  86.     /*
  87.     NFCONT_REG = ( *( (volatile u32 *) (0x70200004) ) )
  88.     NFCONT 0x70200004 读/写NAND Flash 控制寄存器
  89.     [0]1：NAND Flash 控制器使能
  90.     */
  91.     NAND_ENABLE_CE();

  93.     NFCMD_REG = NAND_CMD_READID;

  95.     /*
  96.     NFADDR_REG = ( *( (volatile u32 *) (0x7020000C) ) )
  97.     NFADDR 0x7020000C NAND Flash 地址设置寄存器 */
  98.     NFADDR_REG = 0x00;


  101.     /*
  102.     NFDATA8_REG = ( *( (vu_char *) (0x70200010) ) )
  103.     NFDATA 0x70200010 读/写NAND Flash 数据寄存器
  104.     NAND Flash 读/烧写数据值用于I/O
  105.     */
  106.     /* wait for a while */
  107.     for (i=0; i<200; i++);
  108.     id = NFDATA8_REG;
  109.     id = NFDATA8_REG;
  110.     if (id > 0x80)
  111.         large_block = 1;
  112.         if(id == 0xd5)
  113.             large_block = 2;
  114.             /* read NAND Block.
  115.             * 128KB ->240KB because of U-Boot size increase. by scsuh
  116.             * So, read 0x3c000 bytes not 0x20000(128KB).
  117.             */
  118.             /*CONFIG_SYS_PHY_UBOOT_BASE = 0x57e0 0000
  119.             0x3 c000 = 1M
  120.             */
  121.     return nandll_read_blocks(CONFIG_SYS_PHY_UBOOT_BASE, 0x3c000, large_block);
  122. }
  123. #endif
3.修改cpu/arm1176/makefile文件中

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  1. COBJS = cpu.o nand_cp.o
    4.修改cpu/arm1176/u-boot.lds文件中

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  1. .text :
  2.     {
  3.         cpu/arm1176/start.o (.text)
  4.         cpu/arm1176/s3c64xx/cpu_init.o (.text)
  5.         board/samsung/smdk6410/lowlevel_init.o (.text)
  6.         cpu/arm1176/nand_cp.o (.text)
  7.         lib_arm/board.o (.text)
  8.         *(.text)
  9.     }
    5.修改board/samsung/smdk6410/u-boot-nand.lds文件中

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  1. .text :
  2.     {
  3.       cpu/arm1176/start.o (.text)
  4.       cpu/arm1176/s3c64xx/cpu_init.o (.text)
  5.       board/samsung/smdk6410/lowlevel_init.o (.text)
  6.       cpu/arm1176/nand_cp.o (.text)
  7.       lib_arm/board.o (.text)
  8.       *(.text)
  9.     }
    6.修改nand_spl/board/samsung/smdk6410/Makefile文件中

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  1. # from SoC directory
  2. $(obj)cpu_init.S:
  3.     @rm -f $@
  4.     @ln -s $(TOPDIR)/cpu/arm1176/s3c64xx/cpu_init.S $@

  6. # from from cpu directory
  7. $(obj)nand_cp.c:
  8.     @rm -f $@
  9.     @ln -s $(TOPDIR)/cpu/arm1176/nand_cp.c $@
    7.修改根目录下u-boot.lds文件

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  1. .text :
  2.  {
  3.    cpu/arm1176/start.o (.text)
  4.    cpu/arm1176/s3c64xx/cpu_init.o (.text)
  5.    board/samsung/smdk6410/lowlevel_init.o (.text)
  6.    cpu/arm1176/nand_cp.o (.text)
  7.    lib_arm/board.o (.text)
  8.    *(.text)
  9.  }
    8.修改include/configs/sdmk6410.h文件

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  1. #if !defined(CONFIG_NAND_SPL) && (TEXT_BASE >= 0xc0000000)
  2. #define CONFIG_ENABLE_MMU
  3. #ifdef CONFIG_ENABLE_MMU
  4. #define virt_to_phys(x) virt_to_phy_smdk6410(x)
  5. #else
  6. #define virt_to_phys(x) (x)
  7. #endif
  8. #endif
    添加nand_pc.c中用到的那些宏定义

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  1. #define NAND_DISABLE_CE() (NFCONT_REG |= (1 << 1))
  2. #define NAND_ENABLE_CE() (NFCONT_REG &= ~(1 << 1))
  3. #define NF_TRANSRnB() do { while(!(NFSTAT_REG & (1 << 0))); } while(0)
  4. #define CFG_PHY_UBOOT_BASE CONFIG_SYS_PHY_UBOOT_BASE
    9.再次编译。使用make smdk6410_config; make ;生成u-boot-nand.bin，放到开发板上。
   这次能够从nandflash启动了。^@^
附加:通过网络烧写到nandflash;
tftp 50000000 u-boot-nand.bin;
nand erase;/*擦除nandflash*/
nand scrub;/*标记坏块*/
nand write 50000000 0 40000 /*写在0~40000 地址之间*/






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