一,Linux-3.19内核移植DM9000驱动(JZ2440)
文档时间:2018-08-25
交叉编译器:arm-linux-gcc-4.3.2
Ubuntu版本:16.04
kernel版本:linux-3.19
1,移植内核自带的 DM9000 网卡驱动
使用之前制作的 uboot,kernel 和 文件系统,在 uboot 终端把 machid 设置为 0x16a (SMDK2440),启动内核,然后输入 ifconfig 命令,发现不支持 DM9000,如下图所示:
而如果把 machid 设置为 0x7cf (MINI2440),执行同样的操作,发现其能支持 DM9000 网卡驱动,结果如下:
说明在 mach-mini2440.c 单板文件里有对 DM9000 的支持,查看 mach-mini2440.c(/home/aaron/work/kernel/linux-3.19/arch/arm/mach-s3c24xx目录下)文件,看看是如何支持 DM9000 驱动的:
先查找 "dm9000" 关键字找到 mini2440_device_eth 结构,然后查找 mini2440_device_eth 找到 mini2440_device 结构里调用,查找 mini2440_device_eth 找到在 mini2440_init 函数里调用,如下:
static struct platform_device mini2440_device_eth = { //创建 dm9000 平台设备 .name = "dm9000", .id = -1, //id 号,-1 表示只有一个设备 .num_resources = ARRAY_SIZE(mini2440_dm9k_resource), .resource = mini2440_dm9k_resource, //硬件资源相关 .dev = { .platform_data = &mini2440_dm9k_pdata, }, }; ............. static struct platform_device *mini2440_devices[] __initdata = { &s3c_device_ohci, &s3c_device_wdt, &s3c_device_i2c0, &s3c_device_rtc, &s3c_device_usbgadget, &mini2440_device_eth, //将dm9000平台设备添加到数组里 &mini2440_led1, &mini2440_led2, &mini2440_led3, &mini2440_led4, &mini2440_button_device, &s3c_device_nand, &s3c_device_sdi, &s3c_device_iis, &uda1340_codec, &mini2440_audio, }; .............. static void __init mini2440_init(void) //单板初始化函数 { ................. platform_add_devices(mini2440_devices, ARRAY_SIZE(mini2440_devices)); if (features.count) /* the optional features */ platform_add_devices(features.optional, features.count); //注册添加的平台设备 }
如果与所用板子硬件原理图上 DM9000 引脚不匹配,可以通过查找 "mini2440_dm9k_resource" 来进行修改。
下面仿照上面代码,修改 mach-smdk2440.c(home/aaron/work/kernel/linux-3.19/arch/arm/mach-s3c24xx目录下) 文件,使其能够支持DM9000驱动,修改代码如下(红色为修改部分):
#include <linux/dm9000.h> //添加头文件 /* DM9000AEP 10/100 ethernet controller */ //添加相关宏 static struct resource smdk2440_dm9k_resource[] = { [0] = DEFINE_RES_MEM(MACH_SMDK2440_DM9K_BASE, 4), [1] = DEFINE_RES_MEM(MACH_SMDK2440_DM9K_BASE + 4, 4), [2] = DEFINE_RES_NAMED(IRQ_EINT7, 1, NULL, IORESOURCE_IRQ \ | IORESOURCE_IRQ_HIGHEDGE), }; //添加smdk2440相关结构定义 /* * The DM9000 has no eeprom, and it's MAC address is set by * the bootloader before starting the kernel. */ static struct dm9000_plat_data smdk2440_dm9k_pdata = { .flags = (DM9000_PLATF_16BITONLY | DM9000_PLATF_NO_EEPROM), }; static struct platform_device smdk2440_device_eth = { .name = "dm9000", .id = -1, .num_resources = ARRAY_SIZE(smdk2440_dm9k_resource), .resource = smdk2440_dm9k_resource, .dev = { .platform_data = &smdk2440_dm9k_pdata, }, }; static struct platform_device *smdk2440_devices[] __initdata = { &s3c_device_ohci, &s3c_device_lcd, &s3c_device_wdt, &s3c_device_i2c0, &s3c_device_iis, &smdk2440_device_eth, /在数组里添加该结构 };
make uImage 进行内核编译,在 uboot 中输入以下命令烧写新内核:
nfs 32000000 192.168.2.110:/home/aaron/work/kernel/linux-3.19/arch/arm/boot/uImage set machid 0x16a bootm 32000000
内核启动成功后,输入以下命令验证:
ifconfig eth0 192.168.2.90 //配置 ifconfig //查看
结果如下:
出现如上图所示结果,表示 DM9000 网卡驱动移植成功。
(PS:drivers/net/ethernet/davicom/dm9000.c 和 dm9000.h文件一般不用修改)