nfs根文件系统问题

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1.IP-Config: Complete:

device=eth0, addr=192.168.0.110,mask=255.255.255.0, gw=192.168.0.110,

host=SKY2440, domain=,nis-domain=embedsky.net,

bootserver=192.168.0.104,rootserver=192.168.0.104, rootpath=

VFS: Cannot open root device "nfs" orunknown-block(0,255)

Please append a correct "root=" boot option; here are theavailable partitions:

1f00 1024mtdblock0 (driver?)

1f01 4096mtdblock1 (driver?)

1f02 257024 mtdblock2(driver?)

Kernel panic - not syncing: VFS: Unable to mount root fs onunknown-block(0,255)

解答：编译内核时：

[*] Root file system on NFS 必须选上

更改nfs要重启nfs服务：

sudo /etc/init.d/nfs-kernel-serverrestart

sudo /etc/init.d/portmaprestart

使用showmount -e查看挂载的nfs目录是否正确！

2.nfs: server 192.168.0.104 not responding, still trying

nfs: server 192.168.0.104 OK

根据linux doc下的nfsroot.txt：

nfsroot=[:][,]

If the `nfsroot' parameter is NOT given onthe command line,

the default "/tftpboot/%s" will beused.

Specifies the IP address of the NFSserver.

The default address is determined by the `ip' parameter

(see below). This parameter allows the use of different

servers for IP autoconfiguration and NFS.

Name of the directory on the server tomount as root.

If there is a "%s" token in the string, it will be

replaced by the ASCII-representation of the client's

IP address.

Standard NFS options. All options areseparated by commas.

The following defaults are used:

port = as given by server portmap daemon

rsize = 4096

wsize = 4096

timeo = 7

retrans = 3

acregmin = 3

acregmax = 60

acdirmin = 30

acdirmax = 60

flags = hard, nointr, noposix, cto, ac

设置ubboot参数bootargs=console=ttySAC0 root=/dev/nfsnfsroot=192.168.1.101:/home/csb/code/rootfs,rsize=512,wsize=512ip=192.168.1.110:192.168.1.101:192.168.1.1:255.255.255.0:xxx:eth0:off

#mount -t nfs -o intr,nolock,rsize=1024,wsize=1024host:/path/to/export /client/to/mount

方法不成功！

目前所知道只有使用交叉线开发板连接电脑。

3.mount: RPC: Authentication error; why = Failed (unspecifiederror)

查看/etc/hosts.allow里面，nfs相关服务你板子的IP是否有权访问。

自己当时的问题如nfsd192.168.0.101/255.255.255.0,不晓得为什么加了这个掩码就不是，按理说都是在一个网段内，总之，直接用nfsd192.168.0.101即可

感谢http://blog.sina.com.cn/s/blog_6634dffb0100m29c.html

4.Looking up port of RPC 100005/1 on 192.168.1.101

VFS: Mounted root (nfs filesystem) on device 0:11.

Freeing init memory: 240K

Kernel panic - not syncing: No init found. Try passing init= option to kernel.

使用file /bin/busybox 发现

/bin/busybox: ELF 32-bit LSB executable, Intel 80386, version1 (SYSV), statically linked, for GNU/Linux 2.6.24,BuildID[sha1]=0xb63ac5ddfa302e77851860471656cde35091312e,stripped

oh shit!!!怎么80386都出来了。重新拷贝tq的rootfs

成功后出现

Try to bring eth0 interface up ...

把/etc/init.d/rcS

里面的net_set &注释掉

自此成功在tq原厂的bin文件下建立nfs成功！！

Loading OV9650 driver.........

OV9650 address 0x60, manufacture ID 0xFFFF, expect0x7FA2

No OV9650 found!!!

[01/Apr/2009:01:36:02 +0000] boa: server versionBoa/0.94.13

[01/Apr/2009:01:36:02 +0000] boa: server built Jul 29 2009 at14:27:34.

[01/Apr/2009:01:36:02 +0000] boa: starting server pid=624,port 80

Please press Enter to activate this console.

下一步尝试在自己编译的linux内核下构建nfs

使用自己编译的linux内核下出现：

VFS: Mounted root (nfs filesystem) on device 0:12.

Freeing init memory: 140K

nfs: server 192.168.1.101 not responding, still trying

nfs: server 192.168.1.101 OK

怀疑是rc.S没有编辑好，使用tq内核+自己做的文件系统可以正确启动。内核的dm9000驱动有问题！

根据http://hi.baidu.com/andio/item/f6072b29d9e3bdf850fd8785

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

一、DM9000驱动移植

主要修改俩个文件，一是mach-smdk2440.c,一是dm9000.c

1.1 mach-smdk2440.c

#vi arch/arm/mach-s3c2440/mach-smdk2440.c

修改mach-smdk2440.c，在其中添加如下红色所示的代码,注意gcc中#include是可以随处摆放的的，

因此只需要把如下红色代码copy 就可以了

#include

#define MACH_SMDK2440_DM9K_BASE (S3C2410_CS4 + 0x300)

static struct resource smdk2440_dm9k_resource[] = {

[0] = {

.start =MACH_SMDK2440_DM9K_BASE,

.end =MACH_SMDK2440_DM9K_BASE + 3,

.flags = IORESOURCE_MEM

[1] = {

.start =MACH_SMDK2440_DM9K_BASE + 4,

.end =MACH_SMDK2440_DM9K_BASE + 7,

.flags = IORESOURCE_MEM

[2] = {

.start = IRQ_EINT7,

.end =IRQ_EINT7,

.flags = IORESOURCE_IRQ |IORESOURCE_IRQ_HIGHEDGE,

}

};

static struct dm9000_plat_data smdk2440_dm9k_pdata = {

.flags =(DM9000_PLATF_16BITONLY | DM9000_PLATF_NO_EEPROM),

};

static struct platform_device s3c_device_eth = {

.name ="dm9000",

.id = -1,

.num_resources =ARRAY_SIZE(smdk2440_dm9k_resource),

.resource = smdk2440_dm9k_resource,

.dev = {

.platform_data = &smdk2440_dm9k_pdata,

};

//如上代码置于smdk2440_devices[] 数组前

static struct platform_device *smdk2440_devices[] __initdata ={

&s3c_device_usb,

&s3c_device_lcd,

&s3c_device_wdt,

&s3c_device_i2c0,

&s3c_device_iis,

&s3c_device_eth

};

1.2 dm9000.c

#vi driver/net/dm9000.c

在头文件处添加如下红色的代码

#include "dm9000.h"

#if defined(CONFIG_ARCH_S3C2410)

#include

#endif

修改static int __devinit dm9000_probe(struct platform_device*pdev)函数如下所示，

该函数大概位置1276行，需要修改的大概位置为1460行

db->mii.reg_num_mask = 0x1f;

db->mii.force_media =0;

db->mii.full_duplex =0;

db->mii.dev = ndev;

db->mii.mdio_read = dm9000_phy_read;

db->mii.mdio_write =dm9000_phy_write;

#if defined(CONFIG_ARCH_S3C2410)

printk("Now use the default MAC address:10:23:45:67:89:ab\n");

mac_src ="tq2440";

ndev->dev_addr[0] =0x10;

ndev->dev_addr[1] = 0x23;

ndev->dev_addr[2] = 0x45;

ndev->dev_addr[3] =0x67;

ndev->dev_addr[4] =0x89;

ndev->dev_addr[5] = 0xab;

#else

mac_src = "eeprom";

for (i = 0; i < 6; i += 2)

dm9000_read_eeprom(db, i / 2,ndev->dev_addr+i);

if (!is_valid_ether_addr(ndev->dev_addr)&& pdata != NULL) {

mac_src = "platform data";

memcpy(ndev->dev_addr,pdata->dev_addr, 6);

}

if (!is_valid_ether_addr(ndev->dev_addr)){

mac_src = "chip";

for (i = 0; i < 6; i++)

ndev->dev_addr[i] =ior(db, i+DM9000_PAR);

}

if(!is_valid_ether_addr(ndev->dev_addr))

dev_warn(db->dev, "%s: Invalid ethernetMAC address. Please "

"set using ifconfig\n",ndev->name);

#endif

修改dm9000_init(void)函数如下所示，大概位置1590行

static int __init

dm9000_init(void)

{

#if defined(CONFIG_ARCH_S3C2410)

unsigned int oldval_bwscon = *(volatileunsigned int *)S3C2410_BWSCON;

unsigned int oldval_bankcon4 = *(volatileunsigned int *)S3C2410_BANKCON4;

*((volatile unsigned int *)S3C2410_BWSCON)=

(oldval_bwscon &~(3<<16)) | S3C2410_BWSCON_DW4_16 | S3C2410_BWSCON_WS4 |S3C2410_BWSCON_ST4;

*((volatile unsigned int *)S3C2410_BANKCON4)= 0x1f7c;

#endif

printk(KERN_INFO "%s Ethernet Driver,V%s\n", CARDNAME, DRV_VERSION);

returnplatform_driver_register(&dm9000_driver);

}

编译download后成功出现Please press Enter to activate thisconsole.

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

下面分析一下：

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

//mach-smdk2440.c中定义一个platform_device结构的数组，数组内容为各个设备结构的地址。

static struct platform_device *smdk2440_devices[] __initdata ={

&s3c_device_usb,

&s3c_device_lcd,

&s3c_device_wdt,

&s3c_device_i2c0,

&s3c_device_iis,

&s3c_device_eth

};

//struct platform_device结构的定义在/include/linux/platform_device.h 中。

struct platform_device {

const char * name;

int id;

struct device dev;

u32 num_resources;

struct resource * resource;

struct platform_device_id *id_entry;

struct pdev_archdata archdata;

};

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

lcd driver 分析：

struct s3c2410fb_info {

struct device *dev;

struct clk *clk;

struct resource *mem;

void __iomem *io;

void __iomem *irq_base;

enum s3c_drv_type drv_type;

struct s3c2410fb_hw regs;

unsigned long clk_rate;

unsigned int palette_ready;

#ifdef CONFIG_CPU_FREQ

struct notifier_block freq_transition;

#endif

u32 palette_buffer[256];

u32 pseudo_pal[16];

};

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

重新编译内核,理解下make menuconfig中M和*的区别http://hi.baidu.com/iris_chow/item/609a27d7118ef0362b35c7b1

要增加对某部分功能的支持，比如网络之类，可以把相应部分编译到内核中（build-in），也可以把该部分编译成模块（module），动态调用。

1.选项*（编译到内核）

如果编译到内核中，在内核启动时就可以自动支持相应部分的功能，这样的优点是方便、速度快，机器一启动，你就可以使用这部分功能了；缺点是会使内核变得庞大起来，不管你是否需要这部分功能，它都会存在，这就是Windows惯用的招数，建议经常使用的部分直接编译到内核中，比如网卡。

2.选项M（编译到模块）

如果编译成模块，就会生成对应的.o文件，在使用的时候可以动态加载，优点是不会使内核过分庞大，缺点是你得自己来调用这些模块。

。