原创 u-boot-1.3.4移植到mini2440+128M nand boot(3)

1）对cpu\arm920t\s3c24x0里的nand.c进行如下修改：

#include <common.h>

#if 0
#define DEBUGN printf
#else
#define DEBUGN(x, args ...) {}
#endif

#if defined(CONFIG_CMD_NAND)
#if !defined(CFG_NAND_LEGACY)

#include <nand.h>
#include <s3c2410.h>

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

#define NF_BASE  0x4e000000
#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 NFECC0  __REGb(NF_BASE + 0x14)
#define NFECC1  __REGb(NF_BASE + 0x15)
#define NFECC2  __REGb(NF_BASE + 0x16)

#define S3C2410_NFCONF_EN          (1<<15)
#define S3C2410_NFCONF_512BYTE     (1<<14)
#define S3C2410_NFCONF_4STEP       (1<<13)
#define S3C2410_NFCONF_INITECC     (1<<12)
#define S3C2410_NFCONF_nFCE        (1<<11)
#define S3C2410_NFCONF_TACLS(x)    ((x)<<8)
#define S3C2410_NFCONF_TWRPH0(x)   ((x)<<4)
#define S3C2410_NFCONF_TWRPH1(x)   ((x)<<0)

#elif 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 NFMECCD0 __REGi(NF_BASE + 0x14)
#define NFMECCD1 __REGi(NF_BASE + 0x18)
#define NFSECCD  __REGi(NF_BASE + 0x1C)
#define NFSTAT  __REGb(NF_BASE + 0x20)
#define NFSTAT0  __REGi(NF_BASE + 0x24)
#define NFSTAT1  __REGi(NF_BASE + 0x28)
#define NFMECC0  __REGi(NF_BASE + 0x2C)
#define NFMECC1  __REGi(NF_BASE + 0x30)
#define NFSECC  __REGi(NF_BASE + 0x34)
#define NFSBLK  __REGi(NF_BASE + 0x38)
#define NFEBLK  __REGi(NF_BASE + 0x3c)

#define S3C2440_NFCONT_nCE (1<<1)
#define S3C2440_ADDR_NALE 0x0c
#define S3C2440_ADDR_NCLE 0x08
#endif
static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd)
{
 struct nand_chip *chip = mtd->priv;

 DEBUGN("hwcontrol(): 0x%02x: ", cmd);

#if defined(CONFIG_S3C2410)
 switch (cmd) {
 case NAND_CTL_SETNCE:
  NFCONF &= ~S3C2410_NFCONF_nFCE;
  DEBUGN("NFCONF=0x%08x\n", NFCONF);
  break;
 case NAND_CTL_CLRNCE:
  NFCONF |= S3C2410_NFCONF_nFCE;
  DEBUGN("NFCONF=0x%08x\n", NFCONF);
  break;
 case NAND_CTL_SETALE:
  chip->IO_ADDR_W = NF_BASE + 0x8;
  DEBUGN("SETALE\n");
  break;
 case NAND_CTL_SETCLE:
  chip->IO_ADDR_W = NF_BASE + 0x4;
  DEBUGN("SETCLE\n");
  break;
 default:
  chip->IO_ADDR_W = NF_BASE + 0xc;
  break;
 }
#elif defined(CONFIG_S3C2440)
 switch (cmd) {
 case NAND_CTL_SETNCE:
  NFCONF &= ~S3C2440_NFCONT_nCE;
  DEBUGN("NFCONF=0x%08x\n", NFCONF);
  break;
 case NAND_CTL_CLRNCE:
  NFCONF |= S3C2440_NFCONT_nCE;
  DEBUGN("NFCONF=0x%08x\n", NFCONF);
  break;
 case NAND_CTL_SETALE:
  chip->IO_ADDR_W = NF_BASE + S3C2440_ADDR_NALE;
  DEBUGN("SETALE\n");
  break;
 case NAND_CTL_SETCLE:
  chip->IO_ADDR_W = NF_BASE + S3C2440_ADDR_NCLE;
  DEBUGN("SETCLE\n");
  break;
 default:
  chip->IO_ADDR_W = NF_BASE + 0x10; //注意是0x10
  break;
 }
#endif
 return;
}

static int s3c2410_dev_ready(struct mtd_info *mtd)
{
 DEBUGN("dev_ready\n");
 return (NFSTAT & 0x01);
}

#ifdef CONFIG_S3C2410_NAND_HWECC
void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
 DEBUGN("s3c2410_nand_enable_hwecc(%p, %d)\n", mtd ,mode);
 NFCONF |= S3C2410_NFCONF_INITECC;
}

static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
          u_char *ecc_code)
{
 ecc_code[0] = NFECC0;
 ecc_code[1] = NFECC1;
 ecc_code[2] = NFECC2;
 DEBUGN("s3c2410_nand_calculate_hwecc(%p,): 0x%02x 0x%02x 0x%02x\n",
  mtd , ecc_code[0], ecc_code[1], ecc_code[2]);

 return 0;
}

static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
         u_char *read_ecc, u_char *calc_ecc)
{
 if (read_ecc[0] == calc_ecc[0] &&
     read_ecc[1] == calc_ecc[1] &&
     read_ecc[2] == calc_ecc[2])
  return 0;

 printf("s3c2410_nand_correct_data: not implemented\n");
 return -1;
}
#endif

int board_nand_init(struct nand_chip *nand)
{
 u_int32_t cfg;
 u_int8_t tacls, twrph0, twrph1;
 S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();

 DEBUGN("board_nand_init()\n");

 clk_power->CLKCON |= (1 << 4);

#if defined(CONFIG_S3C2410)
 /* initialize hardware */
 twrph0 = 3; twrph1 = 0; tacls = 0;

 cfg = S3C2410_NFCONF_EN;
 cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
 cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
 cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);

 NFCONF = cfg;

 /* initialize nand_chip data structure */
 nand->IO_ADDR_R = nand->IO_ADDR_W = 0x4e00000c;

 /* read_buf and write_buf are default */
 /* read_byte and write_byte are default */

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

 nand->dev_ready = s3c2410_dev_ready;

#ifdef CONFIG_S3C2410_NAND_HWECC
 nand->enable_hwecc = s3c2410_nand_enable_hwecc;
 nand->calculate_ecc = s3c2410_nand_calculate_ecc;
 nand->correct_data = s3c2410_nand_correct_data;
 nand->eccmode = NAND_ECC_HW3_512;
#else
 //nand->eccmode = NAND_ECC_SOFT;

nand->eccmode = NAND_ECC_NONE;  /*这个ECC先去掉，否则你使用nand write命令和nand read会boot 不起内核*/
#endif

#ifdef CONFIG_S3C2410_NAND_BBT
 nand->options = NAND_USE_FLASH_BBT;
#else
 nand->options = 0;
#endif

#elif defined(CONFIG_S3C2440)
    twrph0 = 6; twrph1 = 2; tacls = 0;
 cfg = (tacls<<12)|(twrph0<<8)|(twrph1<<4);
 NFCONF = cfg;
 cfg = (1<<6)|(1<<4)|(0<<1)|(1<<0);
 NFCONT = cfg;

/* initialize nand_chip data structure */
 nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)0x4e000010;

 /* read_buf and write_buf are default */
 /* read_byte and write_byte are default */

 /* hwcontrol always must be implemented */
 nand->hwcontrol = s3c2410_hwcontrol;
 
 nand->dev_ready = s3c2410_dev_ready;
 
#ifdef CONFIG_S3C2440_NAND_HWECC
 nand->enable_hwecc = s3c2410_nand_enable_hwecc;
 nand->calculate_ecc = s3c2410_nand_calculate_ecc;
 nand->correct_data = s3c2410_nand_correct_data;
 nand->eccmode = NAND_ECC_HW3_512;
#else
// nand->eccmode = NAND_ECC_SOFT;

nand->eccmode = NAND_ECC_NONE;  /*这个ECC先去掉，否则你使用nand write命令和nand read会boot 不起内核*/

#ifdef CONFIG_S3C2440_NAND_BBT
 nand->options = NAND_USE_FLASH_BBT;
#else
 nand->options = 0;
#endif

#endif

 DEBUGN("end of nand_init\n");

 return 0;
}

#else
 #error "U-Boot legacy NAND support not available for S3C2410"
#endif
#endif

2）对include\configs、mini2440.h进行如下修改：

增加

#define CONFIG_CMD_NAND  /* NAND support   */

#define CFG_ENV_IS_IN_NAND  1    /*  */
#define CFG_ENV_OFFSET   0X40000    
/* u-boot:0x00000--0x40000,param:0x40000--0x60000,kernel:0x60000--0x260000 128K block*/
#define CFG_ENV_SIZE  0x10000 /* Total Size of Environment Sector */

//#define CONFIG_SETUP_MEMORY_TAGS 1
//#define CONFIG_CMDLINE_TAG 1

/*nand flash define*/
#if defined(CONFIG_CMD_NAND)
#define CFG_MAX_NAND_DEVICE 1           //just one nand flash chip on board
#define CFG_NAND_BASE      0x4e000000   //nand flash base address

#define SECTORSIZE 2048
/* one page size*/
#define NAND_SECTOR_SIZE SECTORSIZE
#define NAND_BLOCK_MASK (SECTORSIZE - 1)

/*
 * Nandflash Boot
 */
#define CONFIG_S3C2440_NAND_BOOT 1
#endif

3）增加对网口芯片的支持：

同在mini2440.h里，修改Hardware drivers的定义：

/*
 * 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_DM9000 1
#define CONFIG_DM9000_BASE 0x20000300
#define DM9000_IO CONFIG_DM9000_BASE
#define DM9000_DATA (CONFIG_DM9000_BASE+4)
#define CONFIG_DM9000_USE_16BIT

并确保#define CONFIG_CMD_NET  /* bootp, tftpboot, rarpboot */打开，设置相关TFTP操作的定义，如下：

#define CONFIG_BOOTDELAY 3
#define CONFIG_BOOTARGS "root=ramfs devfs=mount console=ttySA0,115200n81"
#define CONFIG_ETHADDR 08:00:3e:26:0a:5b
#define CONFIG_NETMASK          255.255.255.0
#define CONFIG_IPADDR  192.168.1.250
#define CONFIG_SERVERIP  192.168.1.100
#define CONFIG_BOOTFILE "zImage.img"
/*#define CONFIG_BOOTCOMMAND "tftp; bootm"*/
#define CONFIG_BOOTCOMMAND "tftp 0x30008000 zImage.img\; bootm 30008000"

到这里，make一下，你可以把zImage通过TFTP给BOOT 起来了。

注意zImage必须使用u-boot-1.3.4\toolsl里的mkimage加上文件头才能被u-boot boot起来，本人写了一个sh文件：

#!/bin/sh

mkimage -n 'linux-2.6.31' -A arm -O linux -T kernel -C none -a 0x30008000 -e 0x30008040 -d zImage zImage.img
#=================================================