停在Freeing init memory: 92K，sys_open无法结束

Reny

                                (转)http://blog.sina.com.cn/s/blog_5592d0620100034s.html
在
http://www.kernel.org
下载 2.6.15.4 的内核，
在ftp://ftp.handhelds.org/projects ... x-gcc-3.4.1.tar.bz2下载交叉编译工具
修改Makefile
注释掉以下内容：
#ARCH   ?= $(SUBARCH)
#CROSS_COMPILE      ?=
增加如下内容：
ARCH     : = arm
CROSS_COMPILE =/usr/local/arm/3.4.1/bin/arm-linux-
修改arch\arm\mach-s3c2410\devs.c文件
增加头文件定义
/***********add here***********/
#include
               
#include
               
#include
/**************end add********/
增加nand flash分区信息
/*****************************add here***************************/
static int chip0_map[] = { 0 };
struct mtd_partition s3c_nand_part[] = {
[0] = {
.name = "vivi",
.offset = 0x00000000,
.size = 0x00020000,
},
[1] = {
.name = "param",
.offset = 0x00020000,
.size = 0x00010000,
},
[2] = {
.name = "kernel",
.offset = 0x00030000,
.size = 0x001d0000,
},
[3] = {
.name = "root",
.offset = 0x00200000,
.size = 0x03dfc000,
}
};
static struct s3c2410_nand_set s3c_nand_sets[] = {
[0] = {
.name = "chip0",
.nr_chips = 1,
.nr_map = chip0_map,
.nr_partitions = ARRAY_SIZE(s3c_nand_part),
.partitions = s3c_nand_part
}
};
static struct s3c2410_platform_nand s3c_nand_info = {
.tacls = 0,
.twrph0 = 30,
.twrph1 = 0,
.nr_sets = ARRAY_SIZE(s3c_nand_sets),
.sets = s3c_nand_sets,
};
/********************************end add****************************/
struct platform_device s3c_device_nand = {
        .name                  = "s3c2410-nand",
        .id                  = -1,
        .num_resources          = ARRAY_SIZE(s3c_nand_resource),
        .resource          = s3c_nand_resource,
/***********add here****************/
        .dev = {
        .platform_data = &s3c_nand_info
        }
/**************end here************/
};
可以交叉编译内核了
make mrproper //清楚所有config信息
make clean  //清楚中间代码
make smdk2410_defconfig  //使用默认2410配置
make menuconfig  //配置
make
内核配置选择：
用NFS做根文件系统并配置网络：
主机上配置好NFS和DHCP服务
编译内核选择
Networking  --->     
  

Networking support
        Networking options  --->   
               

   IP: kernel level autoconfiguration
               

     IP: DHCP support
               

     IP: BOOTP support
File systems  --->      
    Network File Systems  --->
       

NFS file system support
       

   Provide NFSv3 client support
       

     Provide client support for the NFSv3 ACL protocol extension
       

   Provide NFSv4 client support (EXPERIMENTAL)
       

   Allow direct I/O on NFS files (EXPERIMENTAL)
        [ ] NFS server support
       

Root file system on NFS                          
网卡驱动：
在下面的网址下载sunshiyou做好的dm9000x.c驱动
http://www.hhcn.com/cgi-bin/topic.cgi?forum=3&topic=101&start=12&show=0
拷贝到drivers/net/arm目录下改名为dm9000.c
我这个开发板用的是EINT0,而2.6内核不能使用这个，所以把EINT0和EINT1焊到一起，驱动里面用的是EINT1。
修改drivers/net/arm/目录下的Kconfig文件，在最后添加如下内容：
Config ARM_DM9000
        tristate "DM9000 for ARM support"
        depends on NET_ETHERNET && ARM && ARCH_SMDK2410
        help
Support for CS8900A chipset based Ethernet cards. If you have a network
(Ethernet) card of this type, say Y and read the Ethernet-HOWTO,
available from as well as.To compile this driver as a module, choose M
here and read.The module will be called cs8900.o.
修改drivers/net/arm/目录下的Makefile文件，在最后添加如下内容：
obj-$(CONFIG_ARM_DM9000)    += dm9000.o
编译内核选择：
Device Drivers  --->
        Network device support  --->
                  Ethernet (10 or 100Mbit)  --->
                       

   DM9000E suport for ARM
linux_cmd_line 配置为 noinitrd root=/dev/nfs nfsroot=192.168.1.130:/mnt/arm nfsaddrs=192.168.1.160 init=/linuxrc console=ttySAC0
在/mnt/arm目录放一个可用的文件系统（我是用cramfs文件解开的）
目前为止网卡已经驱动，并可以挂载上NFSROOT了但内核启动到释放内存就不动了，也没有出错信息。
内核启动到释放内存就不动了：
VFS: Mounted root (cramfs filesystem) readonly.
Freeing init memory: 92K
对内核代码init/main.c进行跟踪：
        if (execute_command) {
printk("***********0\n" );
                run_init_process(execute_command);
printk("***********2\n" );
                printk(KERN_WARNING "Failed to execute %s.  Attempting "
                                        "defaults...\n", execute_command);
printk("***********3\n" );
        }
printk("***********4\n" );
        run_init_process("/sbin/init");
        run_init_process("/etc/init");
        run_init_process("/bin/init");
        run_init_process("/bin/sh");
printk("***********5 \n");
        panic("No init found.  Try passing init= option to kernel.");
屏幕打印：
VFS: Mounted root (cramfs filesystem) readonly.
Freeing init memory: 92K
***********0
linux_cmd_line 去掉init=/linuxrc项，屏幕打印：
VFS: Mounted root (cramfs filesystem) readonly.
Freeing init memory: 92K
***********4
说明run_init_process函数 有问题
在网上一个maillist里看到解决方法：
Hi,
Kulkarni, Ganapatrao P. IN BLR SISL wrote:
[...]
> I am trying to boot the kernel, its comes up and hangs at the end
> (hangs after "Freeing init memory: 64K"), I am not getting the shell
> on the minicom.
>
> Anybody faced such problem??
> Any solution/workaround ... Please
If you have activated "FastFPE math emulation" im kernel config then
try to use the "NWFPE math emulation" (section "General setup" in
menuconfig).
I had the same problem a few weeks ago and solved it on this way (FastFPE seems to be not implemented).
[...]
Regards,
Wolfgang Schriebl
更改选项重新编译内核烧进板子重启：
mount: Mounting none on /root failed: Invalid argument
mount: Mounting none on /tmp failed: Invalid argument
mount: Mounting none on /var failed: Invalid argument
mkdir: Cannot create directory `/var/lib': Read-only file system
mkdir: Cannot create directory `/var/run': Read-only file system
mkdir: Cannot create directory `/var/log': Read-only file system
Please press Enter to activate this console.
BusyBox v1.00 (2006.01.11-14:20+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
-sh: can't access tty; job control turned off
id: unknown uid 0
[@(none) /]#
成功进入Shell。
上面的方法我没成功？？？？？？？？？？？？？
把[] Use the ARM EABI to compile the kernel选上可以，我是成功了
               
               

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