1、設備資源初始化
Linux-2..6.32.2 已經自帶了完善的DM9000網卡驅動驅動(源代碼位置：linux-2.6.32.2/drivers/net/dm9000.c)，它也是一個平臺設備，因此在目標平臺初始化代碼中，只要填寫好相應的結構表即可，具體步驟如下：
(1)、確認已經添加了驅動所需的頭文件dm9000.h：
clx@think:/work/armlinux/linux-2.6.32.2$ gedit arch/arm/mach-s3c2440/mach-mini2440.c
定位到55行附近，加入dm9000.h，如下所示：
#include <plat/common-smdk.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <plat/nand.h>
#include <linux/dm9000.h>
(2)、填充該平臺設備的資源設置
定位到208行附近，加入下面代碼：
tatic struct s3c2410_platform_nandmini2440_nand_info = {
.tacls = 20,
.twrph0 = 60,
.twrph1 = 20,
.nr_sets = ARRAY_SIZE(mini2440_nand_sets),
.sets = mini2440_nand_sets,
.ignore_unset_ecc = 1,
};
/* DM9000AEP 10/100 ethernet controller */
//定義DM9000網卡設備的物理基地址，以便後面用到
#define MACH_MINI2440_DM9K_BASE (S3C2410_CS4 + 0x300)
//再填充該平臺設備的資源設置，以便和 DM9000網卡驅動接口配合起來
static struct resource mini2440_dm9k_resource[] = {
[0] = {
.start = MACH_MINI2440_DM9K_BASE,
.end = MACH_MINI2440_DM9K_BASE + 3,
.flags = IORESOURCE_MEM
},
[1] = {
.start = MACH_MINI2440_DM9K_BASE + 4,
.end = MACH_MINI2440_DM9K_BASE + 7,
.flags = IORESOURCE_MEM
},
[2] = {
.start = IRQ_EINT7,
.end = IRQ_EINT7,
.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
}
};
/*
* * The DM9000 has no eeprom, and it's MACaddress is set by
* * the bootloader before starting the kernel.
* */
static struct dm9000_plat_data mini2440_dm9k_pdata = {
.flags = (DM9000_PLATF_16BITONLY |DM9000_PLATF_NO_EEPROM),
};
static struct platform_device mini2440_device_eth = {
.name = "dm9000",
.id = -1,
.num_resources =ARRAY_SIZE(mini2440_dm9k_resource),
.resource = mini2440_dm9k_resource,
.dev = {
.platform_data = &mini2440_dm9k_pdata,
},
};
static struct platform_device *mini2440_devices[]__initdata = {
&s3c_device_usb,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_nand, //;把nand flash設備添加到開發板的設備列表結構
&mini2440_device_eth, //;把網卡平臺設備添加到開發板的設備列表結構
};
因爲Linux-2.6.32.2的DM9000 網卡驅動並不是專門爲mini2440準備的，所以還要在其源代碼中做一些移植工作，如下步驟。
(1)、clx@think:/work/armlinux/linux-2.6.32.2$ gedit drivers/net/dm9000.c，定位到42行附近，添加2410相關的配置定義，如下紅色部分：
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/io.h>
#include "dm9000.h"
#if defined(CONFIG_ARCH_S3C2410)
#include <mach/regs-mem.h>
#endif
(2) 在dm9000設備的初始化函數中添加如下紅色部分，這裏是配置DM9000所用片選總線的時序，因爲mini2440目前只有一個通過總線外擴的設備，在此設備驅動中直接修改相關的寄存器配置會更加容易理解一些，當然這部分也可以放到mach-mini2440.c中。
打開linux-2.6.32.2/drivers/net/dm9000.c，定位到1557行附近，加入下面代碼：
static int __init
dm9000_init(void)
{
#if defined(CONFIG_ARCH_S3C2410)
unsigned int oldval_bwscon = *(volatile unsigned int *)S3C2410_BWSCON;
unsigned int oldval_bankcon4 = *(volatile unsigned 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);
}
3、關於MAC地址
本開發板所用的DM9000網卡並沒有外接EEPROM用以存儲MAC地址，因此係統中的MAC地址是一個“軟”地址，也就是可以通過軟件進行修改，可以隨意改爲其他值。
打開linux-2.6.32.2/drivers/net/dm9000.c，定位到1461行附近，加入下面一行代碼：
static int __devinit
dm9000_probe(struct platform_device *pdev)
{
... ...
/* try reading the node address from theattached EEPROM */
//;嘗試從EEPROM讀取MAC
地址
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)) {
/* try reading from mac */
mac_src = "chip";
for (i = 0; i < 6; i++)
ndev->dev_addr[i] = ior(db, i+DM9000_PAR);
}
//;使用“軟”MAC地址: 08:90:90:90:90:90
memcpy(ndev->dev_addr,"\x08\x90\x90\x90\x90\x90", 6);
if (!is_valid_ether_addr(ndev->dev_addr))
dev_warn(db->dev, "%s: Invalid ethernet MAC address. Please "
"set using ifconfig\n", ndev->name);
platform_set_drvdata(pdev, ndev);
ret = register_netdev(ndev);
if (ret == 0)
printk(KERN_INFO "%s: dm9000%c at %p,%p IRQ %d MAC: %pM (%s)\n",
ndev->name, dm9000_type_to_char(db->type),
db->io_addr, db->io_data, ndev->irq,
ndev->dev_addr, mac_src);
return 0;
out:
dev_err(db->dev, "not found (%d).\n", ret);
dm9000_release_board(pdev, db);
free_netdev(ndev);
return ret;
}
4、配置內核加入DM9000，並編譯運行測試
(1)、確認在內核中已經配置了網卡驅動
clx@think:/work/armlinux/linux-2.6.32.2$ make menuconfig
開始在內核中配置網卡驅動，依次選擇如下菜單項
Device Drivers --->Network device support ---> Ethernet (10 or 100Mbit) --->
DM9000 已經被選中，這是因爲Linux-2.6.32.2默認的內核配置已經加入了DM9000的支持。
(2)、編譯測試使用”k”命令把它燒寫到開發板，並使用默認的文件系統啓動，在命令行終端運行ifconfig命令可以看到
Try to bring eth0 interface up......eth0: link down
Done
Please press Enter to activate this console.
[root@FriendlyARM /]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:90:90:90:90:90
inet addr:192.168.1.230 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:51 Base address:0xe300
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
插上網線，設置虛擬機爲網橋連接，測試網絡
[root@FriendlyARM /]# eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
[root@FriendlyARM /]# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: seq=0 ttl=64 time=0.963 ms
64 bytes from 127.0.0.1: seq=1 ttl=64 time=0.485 ms
64 bytes from 127.0.0.1: seq=2 ttl=64 time=0.470 ms
64 bytes from 127.0.0.1: seq=3 ttl=64 time=0.484 ms
64 bytes from 127.0.0.1: seq=4 ttl=64 time=0.460 ms
64 bytes from 127.0.0.1: seq=5 ttl=64 time=0.480 ms
64 bytes from 127.0.0.1: seq=6 ttl=64 time=0.466 ms
64 bytes from 127.0.0.1: seq=7 ttl=64 time=0.476 ms
^C
--- 127.0.0.1 ping statistics ---
8 packets transmitted, 8 packets received, 0% packet loss
round-trip min/avg/max = 0.460/0.535/0.963 ms
設置linux主機IPclx@think:/$ sudo ifconfig eth0 192.168.1.233
[root@FriendlyARM /]# ping 192.168.1.233
PING 192.168.1.233 (192.168.1.233): 56 data bytes
64 bytes from 192.168.1.233: seq=0 ttl=64 time=54.493 ms
64 bytes from 192.168.1.233: seq=1 ttl=64 time=1.623 ms
64 bytes from 192.168.1.233: seq=2 ttl=64 time=1.661 ms
64 bytes from 192.168.1.233: seq=3 ttl=64 time=1.774 ms
^C
--- 192.168.1.233 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 1.623/14.887/54.493 ms
至此，說明DM9k網卡驅動移植正常，並且網卡和主機連接正常。