2021年08月26日 | 内核(2.6.14) + 根文件系统 +Qtopia Core 4移植 for S3C2410

TARGET

CPU:   S3C2410X

SDRAM: HY57V561620(32MB) × 2

FLASH: K9F1208(64MB)

NET:   CS8900

HOST

Linux Realse Version: Fecora Core 6

CrossCompiler: gcc-4.1.1/arm-linux-gcc-3.4.1

一、内核移植(2.6.14)

1   修改linux2.6.14下面的makefile文件

    找到ARCH和CROSS_COMPILE，修改

    ARCH ?= arm

    CROSS_COMPILE ?= /usr/local/arm/3.4.1/bin/arm-linux- 

(此处为你交叉编译的路径)

2  设置flash分区

    在arch/arm/machs3c2410/devs.c文件中添加头文件

    #include

    #include

    #include  

    然后建立分区表

    /* 一个Nand Flash总共64MB, 按如下大小进行分区 分区大小自己看着办*/

    static struct mtd_partition partition_info[] ={

        { /* 1MB */

            name: "bootloader",

            size: 0x00100000,

            offset: 0x0,

        },{ /* 3MB */

            name: "kernel",

            size: 0x00300000,

            offset: 0x00100000,

        }, { /* 40MB */

            name: "root",

            size: 0x02800000,

            offset: 0x00400000,

        }, { /* 20MB */

        name: "user",

        size: 0x00f00000,

        offset: 0x02d00000,

        }

    };

    /*加入Nand Flash分区*/

    struct s3c2410_nand_set nandset ={

    nr_partitions: 4, /*指明partition_info中定义的分区数目*/

    partitions: partition_info, /* partition table分区信息表*/

    };

    /*建立Nand Flash芯片支持*/

    struct s3c2410_platform_nand superlpplatform={

        tacls:0,

        twrph0:30,

        twrph1:0,

        sets: &nandset,

        nr_sets: 1,

    };

    tacls, twrph0, twrph1的意思见S3C2410手册的63,

    这3个值最后会被设置到NFCONF中,见S3C2410手册66.

    sets: 支持的分区集        nr_set:分区集的个数

    /*加入Nand Flash芯片支持到Nand Flash驱动

    另外，还要修改此文件中的s3c_device_nand结构体变量,添加对dev成员的赋值*/

    struct platform_device s3c_device_nand = {

        .name = "s3c2410-nand",

            /* Device name */

        .id = -1,

            /* Device ID */

        .num_resources = ARRAY_SIZE(s3c_nand_resource),

        .resource = s3c_nand_resource, /* Nand Flash Controller Registers */

            /* Add the Nand Flash device */

        .dev = {

        .platform_data = &superlpplatform

        }

    };

    指定启动时初始化

    arch/arm/machs-3c2410/mach-smdk2410.c文件

    找到platform_device *smdk2410_devices[] __initdata函数，在该函数体最后加上一条语句:

    &s3c_device_nand,

    禁用禁止Flash ECC校验（有不同说法)

    修改drivers/mtd/nand/s3c2410.c

    找到chip->eccmode = NAND_ECC_SOFT;

    改为chip->eccmode = NAND_ECC_NONE;

    支持启动挂载devfs

    修改fs/Kconfig文件 

    找到menu "Pseudo filesystems" 添加

    config DEVFS_FS

        bool "/dev file system support (OBSOLETE)"

        default y

    config DEVFS_MOUNT

        bool "Automatically mount at boot"

        default y

        depends on DEVFS_FS

3   Yaffs2文件系统支持

下载yaffs2.tar.gz源码包，解压源码，并进入目录执行

#./patch-ker.sh c /linux-2.6.14.1/

注：假定内核源码在/linux-2.6.14.1/

4   编译配置内核，首先先load一个默认的内核/linux-2.6.14/arch/arm/configs/smdk2410_defconfig,在这个配置文件上改

    Loadable module support >

        [*] Enable loadable module support

            [*] Automatic kernel module loading

    System Type >

        [*] S3C2410 DMA support

    Boot options >

        Default kernel command string:

        noinitrd root=/dev/mtdblock2 init=/linuxrc console=ttySAC0,115200

    Floating point emulation >

        [*] NWFPE math emulation

    Device Drivers >

        Memory Technology Devices (MTD) >

            [*] MTD partitioning support

                #支持MTD分区，这样我们在前面设置的分区才有意义

            [*] Command line partition table parsing

                #支持从命令行设置flash分区信息，灵活

            RAM/ROM/Flash chip drivers >

                <*> Detect flash chips by Common Flash Interface (CFI) probe

                <*> Detect nonCFI AMD/JEDECcompatible flash chips

                <*> Support for Intel/Sharp flash chips

                <*> Support for AMD/Fujitsu flash chips

                <*> Support for ROM chips in bus mapping

            NAND Flash Device Drivers >

                <*> NAND Device Support

                <*> NAND Flash support for S3C2410/S3C2440 SoC

Character devices >

            [*] Nonstandard serial port support

            [*] S3C2410 RTC Driver

    File systems >

        <> Second extended fs support #去除对ext2的支持

        Pseudo filesystems >

            [*] /proc file system support

            [*] Virtual memory file system support (former shm fs)

            [*] /dev file system support (OBSOLETE)

            [*] Automatically mount at boot (NEW)

                #这里会看到我们前先修改fs/Kconfig的成果，devfs已经被支持上了

        Miscellaneous filesystems >

            <*> Compressed ROM file system support (cramfs) #支持cramfs

            <*> YAFFS2 file system support                  #支持yaffs2

        Network File Systems >

            <*> NFS file system support

二、CS8900网卡驱动的移植

1   cs8900.c和cs8900.h放到/drivers/net/arm/

2   在cs8900.c中的cs8900_probe()函数中，memset (&priv,0,sizeof (cs8900_t));函数之后添加如下两条语句：

    __raw_writel(0x2211d110,S3C2410_BWSCON);

    __raw_writel(0x1f7c,S3C2410_BANKCON3); 

    添加头文件#include

3   修改drivers/net/arm/目录下的Kconfig文件，在最后添加如下内容：

    config ARM_CS8900

   tristate "CS8900 support"

        depends on NET_ETHERNET && ARM && ARCH_SMDK2410

    help

4   修改drivers/net/arm/目录下的Makefile文件，在最后添加如下内容：

    obj-$(CONFIG_ARM_CS8900)    += cs8900.o

5   在/arch/arm/mach-s3c2410/mach-smdk2410.c文件中，找到smdk2410_iodesc[]结构数组，添加如下如下内容：{vSMDK2410_ETH_IO, 0x19000000, SZ_1M, MT_DEVICE}

    添加头文件#inlcude