nandflash驱动移植－《Mini2440_Linux移植开发实战指南》

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1，按照《Mini2440_Linux移植开发实战指南》一文进行nandflash驱动的移植出现了一些问题，记录下，备后用：

arch/arm/mach-s3c2440/mach-mini2440.c:155: error: array type has incomplete element type

arch/arm/mach-s3c2440/mach-mini2440.c:156: error: array index in non-array initializer

arch/arm/mach-s3c2440/mach-mini2440.c:156: error: (nearinitialization for'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:158: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:158: error: (near initialization for 'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:160: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:160: error: (near initialization for 'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:162: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:162: error: (near initialization for 'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:165: error: array index in non-array initializer

arch/arm/mach-s3c2440/mach-mini2440.c:165: error: (near initialization for'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:166: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:166: error: (near initialization for'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:168: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:168: error: (near initialization for 'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:170: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:170: error: (near initialization for'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:173: error: array index in non-array initializer

arch/arm/mach-s3c2440/mach-mini2440.c:173: error: (near initialization for'mini2440_default_nand_part')

arch/arm/mach-s3c2440/mach-mini2440.c:174: error: field name not in record or union initializer

arch/arm/mach-s3c2440/mach-mini2440.c:174: error: (near initialization for'mini2440_default_nand_part')

………………

arch/arm/mach-s3c2440/mach-mini2440.c:211: warning: excess elements in struct initializer

arch/arm/mach-s3c2440/mach-mini2440.c:211: warning: (near initialization for'mini2440_nand_info')

是因为没有添加相应的头文件：

#include <plat/common-smdk.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/nand.h>

#include <linux/mtd/nand_ecc.h>

#include <linux/mtd/partitions.h>

#include <plat/nand.h>

把以上头文件添加上以后，再编译：make zImage，成功！

2，通过以上的更改，make  zImage编译时通过了，可是下载到开发板里面，运行内核时，又报错了：

S3C24XX NAND Driver, (c) 2004 Simtec Electronics

s3c24xx-nand s3c2440-nand: Tacls=4, 39ns Twrph0=8 79ns, Twrph1=8 79ns

Unable to handle kernel NULL pointer dereference at virtual address 00000018

pgd = c0004000

[00000018] *pgd=00000000

Internal error: Oops: 5 [#1]

与三星的NAND的时序对比：

S3C24XX NAND Driver, (c) 2004 Simtec Electronics

s3c24xx-nand s3c2440-nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns

与调试的信息不符合。再在drivers/mtd/nand/中查找NAND的驱动程序：s3c2410.c

static int s3c2410_nand_setrate(struct s3c2410_nand_info *info)

{

 struct s3c2410_platform_nand *plat = info->platform;

 int tacls_max = (info->cpu_type == TYPE_S3C2412) ? 8 : 4;

 int tacls, twrph0, twrph1;

 unsigned long clkrate = clk_get_rate(info->clk);

 unsigned long uninitialized_var(set), cfg, uninitialized_var(mask);

 unsigned long flags;

 /* calculate the timing information for the controller */

 info->clk_rate = clkrate;

 clkrate /= 1000; /* turn clock into kHz for ease of use */

 if (plat != NULL) {

  tacls = s3c_nand_calc_rate(plat->tacls, clkrate, tacls_max);

  twrph0 = s3c_nand_calc_rate(plat->twrph0, clkrate, 8);

  twrph1 = s3c_nand_calc_rate(plat->twrph1, clkrate, 8);

 } else {

  /* default timings */

  tacls = tacls_max;

  twrph0 = 8;

  twrph1 = 8;

 }

 if (tacls < 0 || twrph0 < 0 || twrph1 < 0) {

  dev_err(info->device, "cannot get suitable timings\n");

  return -EINVAL;

 }

 dev_info(info->device, "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n",

        tacls, to_ns(tacls, clkrate), twrph0, to_ns(twrph0, clkrate), twrph1, to_ns(twrph1, clkrate));

 switch (info->cpu_type) {

 case TYPE_S3C2410:

  mask = (S3C2410_NFCONF_TACLS(3) |

   S3C2410_NFCONF_TWRPH0(7) |

   S3C2410_NFCONF_TWRPH1(7));

  set = S3C2410_NFCONF_EN;

  set |= S3C2410_NFCONF_TACLS(tacls - 1);

  set |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);

  set |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);

  break;

 case TYPE_S3C2440:

 case TYPE_S3C2412:

  mask = (S3C2440_NFCONF_TACLS(tacls_max - 1) |

   S3C2440_NFCONF_TWRPH0(7) |

   S3C2440_NFCONF_TWRPH1(7));

  set = S3C2440_NFCONF_TACLS(tacls - 1);

  set |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);

  set |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);

  break;

 default:

  BUG();

 }

 local_irq_save(flags);

 cfg = readl(info->regs + S3C2410_NFCONF);

 cfg &= ~mask;

 cfg |= set;

 writel(cfg, info->regs + S3C2410_NFCONF);

 local_irq_restore(flags);

 dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg);

 return 0;

}

其中并没有使用我们在mach-mini2440.c中我们为NAND 初始化的信息mini2440_nand_info，而是使用了默认配置：

 {

  /* default timings */

  tacls = tacls_max;

  twrph0 = 8;

  twrph1 = 8;

 }

所以我们在static void __init mini2440_machine_init(void)（此函数在mach-mini2440.c中）中添加

s3c_device_nand.dev.platform_data=&mini2440_nand_info;

将配置的信息传递给驱动。

重新编译，下载内核，就可以了。