linux 2.6.32 在arm9（s3c2440）平台的移植 标题要长(2)

此篇主要对http://blog.csdn.net/dos5gw/archive/2010/08/11/5804587.aspx中的错误做修正和分析,

(1)

s3c2440平台关于nand flash部分的代码,

" 在你弄清楚移植代码的每一个步骤是为什么之前，不要去做所谓的移植，那是毫无意义的"

*****/arch/arm/plat-s3c24xx/common-smdk.c*****

static struct mtd_partition smdk_default_nand_part[] = {
        [0] = {
                .name   = "supervivi",
                .size   = 0x00040000,
                .offset = 0,
        },
        [1] = {
                .name   = "param",
                .offset = 0x00040000,
                .size   = 0x00020000,
        },
        [2] = {
                .name   = "Kernel",
                .offset = 0x00060000,
                .size   = 0x00500000,
        },
        [3] = {
                .name   = "root",
                .offset = 0x00560000,
                .size   = 1024 * 1024 * 1024,
        },
        [4] = {
                .name   = "nand",
                .offset = 0x00000000,
                .size   = 1024 * 1024 * 1024,
        }
}; //changed
static struct s3c2410_nand_set smdk_nand_sets[] = {
        [0] = {
                .name           = "NAND",
                .nr_chips       = 1,
                .nr_partitions  = ARRAY_SIZE(smdk_default_nand_part),//note
                .partitions     = smdk_default_nand_part,
        },
};//not changed
static struct s3c2410_platform_nand smdk_nand_info = {
        .tacls          = 20,
        .twrph0         = 60,
        .twrph1         = 20,
        .nr_sets        = ARRAY_SIZE(smdk_nand_sets),//note
        .sets           = smdk_nand_sets,
};//not changed
static struct platform_device __initdata *smdk_devs[] = {
        &s3c_device_nand, //
        &smdk_led4,
        &smdk_led5,
        &smdk_led6,
        &smdk_led7,
};//not changed
void __init smdk_machine_init(void)
{
        /* Configure the LEDs (even if we have no LED support)*/
        s3c2410_gpio_cfgpin(S3C2410_GPF(4), S3C2410_GPIO_OUTPUT);
        s3c2410_gpio_cfgpin(S3C2410_GPF(5), S3C2410_GPIO_OUTPUT);
        s3c2410_gpio_cfgpin(S3C2410_GPF(6), S3C2410_GPIO_OUTPUT);
        s3c2410_gpio_cfgpin(S3C2410_GPF(7), S3C2410_GPIO_OUTPUT);
        s3c2410_gpio_setpin(S3C2410_GPF(4), 1);
        s3c2410_gpio_setpin(S3C2410_GPF(5), 1);
        s3c2410_gpio_setpin(S3C2410_GPF(6), 1);
        s3c2410_gpio_setpin(S3C2410_GPF(7), 1);
        if (machine_is_smdk2443())
                smdk_nand_info.twrph0 = 50;
        s3c_device_nand.dev.platform_data = &smdk_nand_info; //note
        /*s3c_device_nand的类型是platform_device ,
          这里是platform_device::dev
          s3c_device_nand这个变量是在哪个文件定义的?
          -有的版本的内核代码, 在devs.c中定义s3c_device_nand
          -common-smdk.c中引用了此变量,故这个s3c_device_nand一定不是static.
        */

        platform_add_devices(smdk_devs, ARRAY_SIZE(smdk_devs));
        s3c_pm_init();
}//not changed

把上面涉及nand flash的代码单独摘出来, 看的清楚些,

(2)

内核mane zImage, 烧写~ 开机

Uncompressing Linux...................................................................... done, booting the kernel.
Error: unrecognized/unsupported machine ID (r1 = 0x0000016a).

 

因为mini2440的开发板的bootloader是友善自己的supervivi, 开机后bl向内核传递一个机器码, 如果与内核中的机器码不匹配, 则出现上面的错误,  错误中提示的是0x000007cf, 换成10进制就是1999, 这个应该就是MINI2440的机器码,

BL传递的机器码是0x7cf, 但是内核是按照SMDK2440的配置编译的, 故内核的机器码为0x362,

方法有三, 前两个都麻烦, 要么改内核的机器码, 要么改vivi, 第三种比较简单:

方法就是进viviv,

选[s] Set the boot parameters,

再选[s] Set parameter,

Enter the parameter's name, 此处输入 mach_type

Enter the parameter's value, 此处输入 362

再选[w] Write the parameter table to flash memeory,

再选[q] Quit

再选[b] Boot the system

 

(3)

经过上面的修改, 机器码验证ok, 但是有新错误

sysfs: duplicate filename 's3c2440-nand' can not be created

线索http://www.arm9home.net/simple/index.php?t1878.html

原因是, 在原来的代码中, arch/arm/plat-s3c24xx/common-smdk.c, 已经存在下面的代码:

static struct platform_device __initdata *smdk_devs[] = {
        &s3c_device_nand, //注意这里
        &smdk_led4,
        &smdk_led5,
        &smdk_led6,
        &smdk_led7,
};

但是我照着别的移植帖子做, 完全照抄修改, 改动了arch/arm/mach-s3c2440/mach-smdk2440.c的代码:

static struct platform_device *smdk2440_devices[] __initdata = {
        &s3c_device_usb,
        &s3c_device_lcd,
        &s3c_device_wdt,
        &s3c_device_i2c0,
        &s3c_device_iis,
        &s3c_device_nand, //这里如果加上这行, 就出现错误,重复注册了s3c_device_nand这个设备
};

 

(4)

出现错误:

Kernel panic - not syncing: Attempted to kill init!

线索:http://www.cublog.cn/u1/43090/showart_1967029.html

进入Kernel Configure

Kernel Features  --->
            [*] Use the ARM EABI to compile the kernel                   
            [*]   Allow old ABI binaries to run with this kernel (EXPERIMENTA)

这个EABI支持居然忘了选,,,,,

 

-------------------------

vi arch/arm/tools/mach-types

s3c2410                 ARCH_S3C2410            S3C2410                 182

s3c2440                 ARCH_S3C2440            S3C2440                 362

smdk2440                MACH_SMDK2440           SMDK2440           1008

mini2440                MACH_MINI2440           MINI2440                1999

改为:---------------------------->

smdk2440                MACH_SMDK2440           SMDK2440           1999

mini2440                MACH_MINI2440           MINI2440                1008

偷梁换柱,,, 因为我的板子的Kernel Configure的system type -> S3C2440 Machines,选择的是SMDK2440,

所以编译出的内核的机器码是1008, 但是vivi传递的机器码是1999,

在不改变vivi的情况下, 通过这个方法修改内核的机器码~, 实验~ ok

但是但是但是! 为什么串口中断打印的是: Error: unrecognized/unsupported machine ID (r1 = 0x0000016a). ??

0x16a = 362 !

转自:http://blog.csdn.net/dos5gw/archive/2010/08/13/5808566.aspx