(小白嵌入式)基于S5pv210的arm初级驱动开发之环境安装之移植Linux内核(二)

二,移植linux内核源码 ------ 内核镜像:zimage/uImage

1,获取linux内核源码
从官网下载
www.kernel.org 》内核版本linux-3.0.8.tar.bz2

2,在ubuntu中创建相应的目录
$ mkdir s5pv210
$ mkdir s5pv210/kernel
$ mkdir s5pv210/driver

3,将内核源码拷贝到 ~/s5pv210/kernel ,并解压:
~/s5pv210/kernel$ tar -xvf linux-3.0.8.tar.bz2

4,配置交叉编译器:
cd linux-3.0.8/
vim Makefile
修改下面两行:
195 ARCH ?= arm
196 CROSS_COMPILE ?= arm-none-linux-gnueabi-

5,选择平台:-----soc:s5pv210
方法一:
cp arch/arm/configs/s5pv210_defconfig .config
方法二:
make s5pv210_defconfig

6,平台(开发板)通用的配置
make menuconfig
1》选择串口:COM1
System Type —>
(0) S3C UART to use for low-level messages

	2》选择网络协议支持:
		[*] Networking support  ---> 
				Networking options  --->
					<*> Packet socket 
					<*> Unix domain sockets 
					[*] TCP/IP networking 
					[*]   IP: kernel level autoconfiguration 
	3》选择支持网络文件系统
		 File systems  --->
			 [*] Network File Systems (NEW)  --->
					<*>   NFS client support
					[*]     NFS client support for NFS version 3 
					[*]       NFS client support for the NFSv3 ACL protocol extension 
					[*]   Root file system on NFS
	
	注意:有时候执行make menuconfig,不能进入图形界面,这时有两种情况:
	第一种:没有安装libncurses5-dev
		sudo apt-get install libncurses5-dev
	第二种:窗口太小
		将窗口调整为最大

7,编译内核:
make -j2

  LD [M]  crypto/rng.ko
  LD [M]  drivers/scsi/scsi_wait_scan.ko
  LD [M]  net/ipv4/tunnel4.ko
  LD [M]  net/ipv6/ipv6.ko
  LD [M]  net/ipv6/sit.ko
  LD [M]  net/ipv6/xfrm6_mode_beet.ko
  LD [M]  net/ipv6/xfrm6_mode_transport.ko
  LD [M]  net/ipv6/xfrm6_mode_tunnel.ko
  SHIPPED arch/arm/boot/compressed/lib1funcs.S
  AS      arch/arm/boot/compressed/piggy.gzip.o
  AS      arch/arm/boot/compressed/lib1funcs.o
  LD      arch/arm/boot/compressed/vmlinux
  OBJCOPY arch/arm/boot/zImage
  Kernel: arch/arm/boot/zImage is ready

8,将编译好的内核镜像zImage 拷贝到 /tftpboot
cp arch/arm/boot/zImage /tftpboot

9,重新配置uboot参数
FS210 # set bootcmd tftp 0x40008000 zImage ; bootm 0x40008000
FS210 # sa
10,重启开发板,结果如下:

mousedev: PS/2 mouse device common for all mice
TCP cubic registered
NET: Registered protocol family 17
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 2
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[<80032564>] (unwind_backtrace+0x0/0xf0) from [<8024c978>] (panic+0x70/0x19c)
[<8024c978>] (panic+0x70/0x19c) from [<80008de4>] (mount_block_root+0x15c/0x210)
[<80008de4>] (mount_block_root+0x15c/0x210) from [<80009030>] (mount_root+0xa8/0xc4)
[<80009030>] (mount_root+0xa8/0xc4) from [<800091b0>] (prepare_namespace+0x164/0x1bc)
[<800091b0>] (prepare_namespace+0x164/0x1bc) from [<80008aa0>] (kernel_init+0xe4/0x118)
[<80008aa0>] (kernel_init+0xe4/0x118) from [<8002dee0>] (kernel_thread_exit+0x0/0x8)

根文件系统挂载失败,原因是在内核中没有网卡驱动,所以在编译内核源码时需要将网卡驱动一起编译进去

11,重新编译内核源码,将网卡驱动编译进去--------与平台(开发板)相关的配置
1》修改内核源码—修改网卡驱动
vim arch/arm/mach-s5pv210/mach-smdkv210.c
修改下面两个数据:

static struct resource smdkv210_dm9000_resources[] = {
				[0] = {
						.start = 0x88000000,
						.end = 0x88000000 + 0x3,
						.flags = IORESOURCE_MEM,   //地址端口
				},
				[1] = {
						.start = 0x88000000 + 0x4,
						.end = 0x88000000 + 0x4 + 0x3,
						.flags = IORESOURCE_MEM,   //数据端口
				},
				[2] = {
						.start = IRQ_EINT(10),
						.end = IRQ_EINT(10),
						.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL,
				},
		};
		static struct dm9000_plat_data smdkv210_dm9000_platdata = {
				.flags          = DM9000_PLATF_16BITONLY | DM9000_PLATF_NO_EEPROM,
				.dev_addr       = { 0x00, 0x09, 0xc0, 0xff, 0xec, 0xYY}, /* YY为座位号,如果座位号小于10, 则在前面添加0, 比如座位号为6,则可以填06 */
		};
	
		修改初始化函数:
		static void __init smdkv210_dm9000_init(void)
		{
			unsigned int tmp;
			gpio_request(S5PV210_MP01(1), "nCS1");
			s3c_gpio_cfgpin(S5PV210_MP01(1), S3C_GPIO_SFN(2));
			gpio_free(S5PV210_MP01(1));
				tmp = (5 << S5P_SROM_BCX__TACC__SHIFT);
			__raw_writel(tmp, S5P_SROM_BC1);
			tmp = __raw_readl(S5P_SROM_BW);
			tmp &= (S5P_SROM_BW__CS_MASK << S5P_SROM_BW__NCS1__SHIFT);
			tmp |= (1 << S5P_SROM_BW__NCS1__SHIFT);
			__raw_writel(tmp, S5P_SROM_BW);
		}
2》在 make menuconfig 中添加网卡驱动选项
	 Device Drivers  ---> 
		[*] Network device support  --->
				 [*]   Ethernet (10 or 100Mbit)  ---> 
					 <*>   DM9000 support
					 (4)     DM9000 maximum debug level (NEW)
3》重新编译内核源码
	make -j2
	
	 LD [M]  net/ipv6/sit.ko
	  Kernel: arch/arm/boot/Image is ready
	  LD [M]  net/ipv6/xfrm6_mode_beet.ko
	  LD [M]  net/ipv6/xfrm6_mode_transport.ko
	  GZIP    arch/arm/boot/compressed/piggy.gzip
	  LD [M]  net/ipv6/xfrm6_mode_tunnel.ko
	  SHIPPED arch/arm/boot/compressed/lib1funcs.S
	  AS      arch/arm/boot/compressed/lib1funcs.o
	  AS      arch/arm/boot/compressed/piggy.gzip.o
	  LD      arch/arm/boot/compressed/vmlinux
	  OBJCOPY arch/arm/boot/zImage
	  Kernel: arch/arm/boot/zImage is ready

4》重新将内核镜像拷贝到/tftpboot 
	 cp arch/arm/boot/zImage /tftpboot/

12,重启开发板,观察结果:

TCP cubic registered
NET: Registered protocol family 17
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 2
dm9000 dm9000: eth0: link down
dm9000 dm9000: eth0: link up, 100Mbps, full-duplex, lpa 0x41E1
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
	 device=eth0, addr=192.168.7.7, mask=255.255.255.0, gw=255.255.255.255,
	 host=192.168.7.7, domain=, nis-domain=(none),
	 bootserver=255.255.255.255, rootserver=192.168.7.5, rootpath=
VFS: Mounted root (nfs filesystem) on device 0:10.
Freeing init memory: 124K
===========^_^ fs start==========
===========@_@ fs end==========

Please press Enter to activate this console.
[root@farsight /]# ls
bin         etc         lib         opt         sbin        usr
dev         hello_arm   linuxrc     proc        sys
drv_module  home        mnt         root        tmp
[root@farsight /]#

============================内核移植成功!==================================
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