Linux 2.6.30内核移植到S3C2440——CS8900网卡移植


开发环境：主机：Window XP SP2；linux：VMware7.01+Ubuntu9.10；目标板：扬创utu2440-F开发板

交叉编译器：arm-linux-3.4.1

一、说明：

本CS8900网卡驱动移植是基于之前内核版本的，实际上是从扬创开发板附送光盘上拷贝下来的CS8900源文件移植而来。

移植好的CS8900网卡驱动在扬创ubu2440-F开发板上已验证通过。

二、移植要点：

CS8900网卡驱动移植到基于linux2.6.30内核版本的S3C2440中，主要关注其中几点：

1. 基于旧的CS8900网卡驱动；

2. CS8900网卡驱动的BSP信息构造；

2. 头文件的变化；

3. linux2.6.30的struct net_device有变化，主要是没有了priv这个成员变量；

本文要用到的相关文件在帮客之家的1号FTP服务器里，下载地址：

FTP地址：ftp://www.bkjia.com

用户名：www.bkjia.com

密码：www.muu.cc

在 2011年LinuxIDC.com\6月\Linux 2.6.30内核移植到S3C2440——CS8900网卡移植

下载方法见 http://www.bkjia.net/thread-1187-1-1.html

三、移植步骤：

１. 在drivers/net/arm/ 目录下添加 cs8900.c，cs8900.h两个文件。

如果是你自己重新移植的话，这两文件可从帮客之家FTP上下载；如果使用本人移植好的驱动（可以省略一些步骤）。

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

  1. config ARM_CS8900    
  2.     tristate "CS8900 support"    
  3.     depends on ARM || BLACKFIN || MIPS    
  4.     help    
  5.       support for cs8900 chipset based Ethernet cards , if you  have a network card of this type  

3. 修改drivers/net/arm/Makefile文件，添加：
obj-$(CONFIG_ARM_CS8900) += cs8900.o

4. 编译配置内核，进入配置菜单，添加CS8900驱动到内核：
# make menuconfig

Device Drivers  --->

       [*] Network device support  --->

              [*]   Ethernet (10 or 100Mbit)  --->

                     <*>   CS8900 support

５.  添加BSP关于CS8900网卡驱动信息：

如果是移植到2410，则打开arch/arm/mach-s3c2410/mach-smdk2410.c文件；如果是移植到2440，则打开arch/arm/mach-s3c2440/mach-smdk2440.c。本人使用自己创建的BSP文件，即arch/arm/mach-s3c2440/mach-reille2440.c，在static struct map_desc smdk2410_iodesc[] __initdata (对2410而言)或static struct map_desc smdk2440_iodesc[] __initdata(对2440而言)最后添加：

  1. ,{    
  2.         // support cs8900|added by guoyirong 2011.06.04    
  3.           .virtual     = vSMDK2410_ETH_IO,        // virtural addr that will be remapped    
  4.           .pfn          = __phys_to_pfn(S3C2410_CS3 + (1<<24)),    
  5.           .length      = SZ_1M,    
  6.           .type          = MT_DEVICE,    
  7.  }  

６. 修改arch/arm/mach-s3c2410/include/mach/map.h文件，在最后添加：

  1. /* CS8900 */   
  2. #define pSMDK2410_ETH_IO     __phys_to_pfn(0x19000000)   
  3. #define vSMDK2410_ETH_IO     0xE0000000   
  4. #define SMDK2410_ETH_IRQ     IRQ_EINT9  

７. 编译内核：

如果是使用我移植好的CS8900驱动，则不会有问题，如果是使用从网上下载或从我博客资源上下载的未移植好的C8900驱动，则编译时会出现很多错误，包括头文件、宏定义、priv成员等错误，如下所示：

drivers/net/arm/cs8900.c:56:26: asm/hardware.h: No such file or directory

drivers/net/arm/cs8900.c:71:30: asm/arch/bit-map.h: No such file or directory

drivers/net/arm/cs8900.c:72:31: asm/arch/regs-mem.h: No such file or directory

drivers/net/arm/cs8900.c:96: error: unknown field `init' specified in initializer

drivers/net/arm/cs8900.c:97: warning: missing braces around initializer

drivers/net/arm/cs8900.c:97: warning: (near initialization for `cs8900_dev.name')

drivers/net/arm/cs8900.c:97: warning: initialization makes integer from pointer without a cast

drivers/net/arm/cs8900.c:97: error: initializer element is not computable at load time

drivers/net/arm/cs8900.c:97: error: (near initialization for `cs8900_dev.name[0]')

drivers/net/arm/cs8900.c:97: error: initializer element is not constant

drivers/net/arm/cs8900.c:97: error: (near initialization for `cs8900_dev.name')

drivers/net/arm/cs8900.c:117: error: variable `cs8900_eeprom_fops' has initializer but incomplete type

drivers/net/arm/cs8900.c:118: error: unknown field `owner' specified in initializer

drivers/net/arm/cs8900.c:118: warning: excess elements in struct initializer

drivers/net/arm/cs8900.c:118: warning: (near initialization for `cs8900_eeprom_fops')

drivers/net/arm/cs8900.c:119: error: unknown field `open' specified in initializer

drivers/net/arm/cs8900.c:119: warning: excess elements in struct initializer

drivers/net/arm/cs8900.c:119: warning: (near initialization for `cs8900_eeprom_fops')

drivers/net/arm/cs8900.c:120: error: unknown field `release' specified in initializer

drivers/net/arm/cs8900.c:120: warning: excess elements in struct initializer

drivers/net/arm/cs8900.c:120: warning: (near initialization for `cs8900_eeprom_fops')

drivers/net/arm/cs8900.c:121: error: unknown field `llseek' specified in initializer

drivers/net/arm/cs8900.c:121: warning: excess elements in struct initializer

drivers/net/arm/cs8900.c:121: warning: (near initialization for `cs8900_eeprom_fops')

drivers/net/arm/cs8900.c:122: error: unknown field `read' specified in initializer

drivers/net/arm/cs8900.c:122: warning: excess elements in struct initializer

drivers/net/arm/cs8900.c:122: warning: (near initialization for `cs8900_eeprom_fops')

drivers/net/arm/cs8900.c:123: error: unknown field `write' specified in initializer

drivers/net/arm/cs8900.c:123: warning: excess elements in struct initializer

drivers/net/arm/cs8900.c:123: warning: (near initialization for `cs8900_eeprom_fops')

drivers/net/arm/cs8900.c: In function `cs8900_receive':

drivers/net/arm/cs8900.c:343: error: structure has no member named `priv'

drivers/net/arm/cs8900.c: In function `cs8900_send_start':

drivers/net/arm/cs8900.c:382: error: structure has no member named `priv'

drivers/net/arm/cs8900.c: In function `cs8900_interrupt':

drivers/net/arm/cs8900.c:434: error: structure has no member named `priv'

drivers/net/arm/cs8900.c:439: error: structure has no member named `priv'

drivers/net/arm/cs8900.c: In function `cs8900_transmit_timeout':

drivers/net/arm/cs8900.c:496: error: structure has no member named `priv'

drivers/net/arm/cs8900.c: In function `cs8900_start':

drivers/net/arm/cs8900.c:508: error: implicit declaration of function `set_irq_type'

drivers/net/arm/cs8900.c:508: error: `IRQT_RISING' undeclared (first use in this function)

drivers/net/arm/cs8900.c:508: error: (Each undeclared identifier is reported only once

drivers/net/arm/cs8900.c:508: error: for each function it appears in.)

drivers/net/arm/cs8900.c:523: warning: passing arg 2 of `request_irq' from incompatible pointer type

drivers/net/arm/cs8900.c: In function `cs8900_get_stats':

drivers/net/arm/cs8900.c:580: error: structure has no member named `priv'

drivers/net/arm/cs8900.c: In function `cs8900_eeprom':

drivers/net/arm/cs8900.c:599: error: structure has no member named `priv'

drivers/net/arm/cs8900.c:618: error: implicit declaration of function `register_chrdev'

drivers/net/arm/cs8900.c: In function `cs8900_eeprom_fllseek':

drivers/net/arm/cs8900.c:674: error: dereferencing pointer to incomplete type

drivers/net/arm/cs8900.c:686: error: dereferencing pointer to incomplete type

drivers/net/arm/cs8900.c: In function `cs8900_probe':

drivers/net/arm/cs8900.c:778: error: `S3C2410_BWSCON' undeclared (first use in this function)

drivers/net/arm/cs8900.c:779: error: `S3C2410_BANKCON3' undeclared (first use in this function)

drivers/net/arm/cs8900.c:807: error: structure has no member named `priv'

drivers/net/arm/cs8900.c:811: error: implicit declaration of function `SET_MODULE_OWNER'

drivers/net/arm/cs8900.c: In function `cs8900_cleanup':

drivers/net/arm/cs8900.c:916: error: structure has no member named `priv'

drivers/net/arm/cs8900.c:919: error: implicit declaration of function `unregister_chrdev'

drivers/net/arm/cs8900.c: In function `cs8900_probe':

drivers/net/arm/cs8900.c:778: warning: statement with no effect

drivers/net/arm/cs8900.c:779: warning: statement with no effect

drivers/net/arm/cs8900.c: At top level:

drivers/net/arm/cs8900.c:117: error: storage size of `cs8900_eeprom_fops' isn't known

make[3]: *** [drivers/net/arm/cs8900.o] Error 1

make[2]: *** [drivers/net/arm] Error 2

make[1]: *** [drivers/net] Error 2

make: *** [drivers] Error 2

————————————————————————

上述错误如下处理：

1) 把#include <asm/hardware.h> 、#include "asm/arch/bit-map.h"和#include <asm/arch/regs-mem.h>屏蔽掉，同时增加如下头文件：

  1. #include <mach/hardware.h>  
  2. #include <mach/regs-mem.h>  
  3. #include <mach/regs-irq.h>  

2) netdevice.h 中struct net_device结构体又添上了：void *priv;

3) 把#include <linux/irq.h>文件包含，同时在CS8900.c文件中定义如下宏：

  1. #define IRQT_RISING IRQ_TYPE_EDGE_RISING  

把823行屏蔽掉。

4)对于错误：drivers/net/arm/cs8900.c:96: error: unknown field `init' specified in initializer

这个错误不知道怎么解决，我是把那行屏蔽掉了，同时把它改为在cs8900_init()函数中进行初始化。

按上述处理后，启动时会出现错误：操作了空指针，这是由于cs8900.c中静态定义了cs8900_dev但没有分配私有成员空间的缘故。

因此，改用alloc_etherdev()函数分配cs8900_dev就可以了。

具体的可以对比本人移植前后的的cs8900.c的源代码。

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