基于S3C2410的Linux2.6.24.7内核移植

原文出处　http://blog.chinaunix.net/u1/58780/showart_1080188.html　Jacky Xu

 

一、主机环境
  Linux version 2.4.20-8, RedHat9, VMWare5.5.3;
  gcc version 3.4.4, Thread model: posix;
  GNU Make 3.81;
  arm-linux-gcc 4.2.1 （此创建过程见另贴用crosstool脚本编译针对Linux2.6内核的交叉编译工具链 ）

二、编译内核
1、解压linux-2.6.24.7.tar.gz，修改Makefile中的ARCH和CROSS_COMPILE对应内容。修改本机的交叉编译工具链的路径和前缀。

ARCH ? = arm CROSS_COMPILE ? = / opt/ crosstool/ bin/ arm- s3c2410- linux- gnu-

2、修改NandFlash分区，和Bootloader中的一样。我分了5个区。
[root@Sure linux-2.6.24.7]# vim arch/arm/plat-s3c24xx/common-smdk.c

static struct mtd_partition smdk_default_nand_part[ ] = {     [ 0] = {         . name = "Bootloader" ,         . size = SZ_1M,         . offset = 0,     } ,     [ 1] = {         . name = "Kernel" ,         . offset = SZ_1M,         . size = SZ_1M * 3,     } ,     [ 2] = {         . name = "Root" ,         . offset = SZ_4M,         . size = SZ_4M * 12,     } ,     [ 3] = {         . name = "ExtRoot" ,         . offset = SZ_4M * 13,         . size = 0x00be0000, //12M - 128K     } ,     [ 4] = {         . name = "Param" ,         . offset = SZ_4M * 13 + 0x00be0000,         . size = 0x00020000, //128K     } ,  } ;

3、修改fs/Kconfig文件，使内核支持devfs以及在启动时并在/sbin/init运行之前能自动挂载/dev为devfs文件系统。

menu "Pseudo filesystems" # jacky - - > config DEVFS_FS     bool "/dev file system support(OBSOLETE)"     default y config DEVFS_MOUNT     bool "Automatically mount at boot"     default y     depends on DEVFS_FS # jacky < - -

4、移植CS8900A网卡驱动。从网上下载了cs8900驱动，是针对2.6.14内核的。
（1）将cs8900.c、cs8900.h复制到drivers/net/arm目录下。
（2）在include/asm-arm/arch-s3c2410/下新建smdk2410.h，添加如下代码：

# define pSMDK2410_ETH_IO __phys_to_pfn( 0x19000000) # define vSMDK2410_ETH_IO 0xe0000000 # define SMDK2410_ETH_IRQ IRQ_EINT9

（3）修改arch/arm/mach-s3c2410/mach-smdk2410.c文件（line:59）：

static struct map_desc smdk2410_iodesc[ ] __initdata = {   /* nothing here yet */     { vSMDK2410_ETH_IO, pSMDK2410_ETH_IO, SZ_1M, MT_DEVICE} ,     //added by Jacky_Xu @ 2008.7.12 } ;

（4）注意cs8900.c源文件中，cs8900_probe()函数中的两句话（见下）不能被注释掉，否则会检测不到网卡的，我在这里搞了一天时间，原来是下载的源码被人为注释掉了。。。

__raw_writel( 0x2211d110, S3C2410_BWSCON) ;     __raw_writel( 0x1f7c, S3C2410_BANKCON3) ;

（5）在drivers/net/arm/Kconfig中添加编译选项。这样，在menuconfig时，CS8900A网卡会被添加并选中。

# jacky - - > config ARM_CS8900A     tristate "CS8900A support"     depends on NET_ETHERNET & & ARM & & ARCH_SMDK2410     help       Support for CS8900A chipset based Ethernet cards. If you have a network       ( Ethernet) card of this type, say Y and read the Ethernet- HOWTO,       available from as well as. To compile this driver as a module,       choose M here and read . The module will be called CS8900. o. # jacky < - -

（6）添加编译选项的依赖文件。在drivers/net/arm/Makefile中添加：

obj- $ ( CONFIG_ARM_CS8900A) + = cs8900. o

5、复制make的配置文件。
[root@Sure linux-2.6.24.7]#  cp arch/arm/configs/s3c2410_defconfig .config

6、make menuconfig。上面手动添加的DEVFS和CS8900A应该都会出现并被选中了，再选择一些需要的东西，如传递给内核的参数、MMC/SD等。

7、make

8、把arch/arm/boot目录下的zImage下到板子上运行。我传递给内核的参数为
“root=/dev/nfs rw nfsroot=192.168.1.249:/home/jacky/root-s3c2410/rootfs ip=192.168.1.199:192.168.1.249:192.168.1.1:255.255.255.0:Jacky:eth0:off console=ttySAC0,115200 init=/linuxrc noinitrd”，可用Bootloader传，也可以在编译内核时写入内核。
以下是启动信息：

Boot Parameters: root= / dev/ nfs rw nfsroot= 192. 168. 1. 249: / home/ jacky/ root- s3c2410/ rootfs ip= 192. 168. 1. 199: 192. 168. 1. 249: 192. 168. 1. 1: 255. 255. 255. 0: Jacky: eth0: off console= ttySAC0, 115200 init= / linuxrc noinitrd Now, booting Linux. . . Uncompressing Linux. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . done, booting the kernel. Linux version 2. 6. 24. 7 ( root@Sure) ( gcc version 4. 2. 1) # 5 Sat Jul 12 17: 26: 16 CST 2008 CPU: ARM920T [ 41129200] revision 0 ( ARMv4T) , cr= c0007177 Machine: SMDK2410 ATAG_INITRD is deprecated; please update your bootloader. Memory policy: ECC disabled, Data cache writeback CPU S3C2410A ( id 0x32410002) S3C2410: core 200. 000 MHz, memory 100. 000 MHz, peripheral 50. 000 MHz S3C24XX Clocks, ( c) 2004 Simtec Electronics CLOCK : Slow mode ( 1. 500 MHz) , fast, MPLL on, UPLL on CPU0: D VIVT write - back cache CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256 Kernel command line : root= / dev/ nfs rw nfsroot= 192. 168. 1. 249: / home/ jacky/ busybox- s3c2410/ root ip= 192. 168. 1. 199: 192. 168. 1. 249: 192. 168. 1. 1: 255. 255. 255. 0: Jacky: eth0: off console= ttySAC0, 115200 init= / linuxrc irq: clearing subpending status 00000003 PID hash table entries: 256 ( order: 8, 1024 bytes) timer tcon= 00000000, tcnt a2c1, tcfg 00000200, 00000000, usec 00001eb8 Console: colour dummy device 80x30 console [ ttySAC0] enabled Dentry cache hash table entries: 8192 ( order: 3, 32768 bytes) Inode- cache hash table entries: 4096 ( order: 2, 16384 bytes) Memory: 64MB = 64MB total Memory: 61440KB available ( 3048K code, 314K data, 128K init) Mount- cache hash table entries: 512 CPU: Testing write buffer coherency: ok net_namespace: 64 bytes NET: Registered protocol family 16 S3C2410 Power Management, ( c) 2004 Simtec Electronics S3C2410: Initialising architecture S3C24XX DMA Driver, ( c) 2003- 2004, 2006 Simtec Electronics DMA channel 0 at c4800000, irq 33 DMA channel 1 at c4800040, irq 34 DMA channel 2 at c4800080, irq 35 DMA channel 3 at c48000c0, irq 36 usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb Bluetooth: Core ver 2. 11 NET: Registered protocol family 31 Bluetooth: HCI device and connection manager initialized Bluetooth: HCI socket layer initialized NET: Registered protocol family 2 IP route cache hash table entries: 1024 ( order: 0, 4096 bytes) TCP established hash table entries: 2048 ( order: 2, 16384 bytes) TCP bind hash table entries: 2048 ( order: 1, 8192 bytes) TCP: Hash tables configured ( established 2048 bind 2048) TCP reno registered NetWinder Floating Point Emulator V0. 97 ( double precision) JFFS2 version 2. 2. ( NAND) & Acirc; & copy ; 2001- 2006 Red Hat, Inc. JFS: nTxBlock = 480, nTxLock = 3840 io scheduler noop registered io scheduler anticipatory registered ( default ) io scheduler deadline registered io scheduler cfq registered s3c2410- lcd s3c2410- lcd: no platform data for lcd, cannot attach s3c2410- lcd: probe of s3c2410- lcd failed with error - 22 lp: driver loaded but no devices found ppdev: user- space parallel port driver Serial: 8250/ 16550 driver $Revision: 1. 90 $ 4 ports, IRQ sharing enabled s3c2410- uart. 0: s3c2410_serial0 at MMIO 0x50000000 ( irq = 70) is a S3C2410 s3c2410- uart. 1: s3c2410_serial1 at MMIO 0x50004000 ( irq = 73) is a S3C2410 s3c2410- uart. 2: s3c2410_serial2 at MMIO 0x50008000 ( irq = 76) is a S3C2410 RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize loop: module loaded Cirrus Logic CS8900A driver for Linux ( Modified for SMDK2410) eth0: CS8900A rev E at 0xe0000300 irq= 53, addr: 00: 0: 3E: 26: 0A: 0 Uniform Multi- Platform E- IDE driver Revision: 7. 00alpha2 ide: Assuming 50MHz system bus speed for PIO modes; override with idebus= xx S3C24XX NAND Driver, ( c) 2004 Simtec Electronics s3c2410- nand s3c2410- nand: Tacls= 3, 30ns Twrph0= 7 70ns, Twrph1= 3 30ns NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 ( Samsung NAND 64MiB 3, 3V 8- bit) Scanning device for bad blocks Creating 5 MTD partitions on "NAND 64MiB 3,3V 8-bit" : 0x00000000- 0x00100000 : "Bootloader" 0x00100000- 0x00400000 : "Kernel" 0x00400000- 0x03400000 : "Root" 0x03400000- 0x03fe0000 : "ExtRoot" 0x03fe0000- 0x04000000 : "Param" usbmon: debugfs is not available s3c2410- ohci s3c2410- ohci: S3C24XX OHCI s3c2410- ohci s3c2410- ohci: new USB bus registered, assigned bus number 1 s3c2410- ohci s3c2410- ohci: irq 42, io mem 0x49000000 usb usb1: configuration # 1 chosen from 1 choice hub 1- 0: 1. 0: USB hub found hub 1- 0: 1. 0: 2 ports detected mice: PS/ 2 mouse device common for all mice S3C24XX RTC, ( c) 2004, 2006 Simtec Electronics s3c2410- i2c s3c2410- i2c: slave address 0x10 s3c2410- i2c s3c2410- i2c: bus frequency set to 390 KHz s3c2410- i2c s3c2410- i2c: i2c- 0: S3C I2C adapter S3C2410 Watchdog Timer, ( c) 2004 Simtec Electronics s3c2410- wdt s3c2410- wdt: watchdog inactive, reset disabled, irq enabled TCP cubic registered NET: Registered protocol family 1 NET: Registered protocol family 17 RPC: Registered udp transport module. RPC: Registered tcp transport module. drivers/ rtc/ hctosys. c: unable to open rtc device ( rtc0) IP- Config: Complete:       device= eth0, addr= 192. 168. 1. 199, mask= 255. 255. 255. 0, gw= 192. 168. 1. 1,      host= Jacky, domain= , nis- domain= ( none ) ,      bootserver= 192. 168. 1. 249, rootserver= 192. 168. 1. 249, rootpath= Looking up port of RPC 100003/ 2 on 192. 168. 1. 249 Looking up port of RPC 100005/ 1 on 192. 168. 1. 249 VFS: Mounted root ( nfs filesystem) .

因为主机的/home/jacky/busybox-s3c2410/root的文件系统还没做好，所以停在这里了。从主机的/var/log/message看出来目标板已经尝试连接NFS服务了：

Jul 12 21: 33: 05 localhost rpc. mountd: authenticated mount request from 192. 168. 1. 199: 966 for / home/ jacky/ busybox- s3c2410/ root ( / home/ jacky/ busybox- s3c2410/ root)
Jul 12 21: 38: 41 localhost rpc. mountd: authenticated mount request from 192. 168. 1. 199: 806 for / home/ jacky/ busybox- s3c2410/ root ( / home/ jacky/ busybox- s3c2410/ root)