kernel-yizhi.txt

将内核移植到s3c2410上

Found saved vivi parameters.                            
CS8900 - type: 630e, rev: a00                             
CS8900 - status: ad6 (EEPROM present)                                     
Setting MAC address...                      
Display format changed to VGA 640X480 mode                                          
Press Return to start the LINUX now, any other key fo                                                   
Copy linux kernel from 0x00030000 to 0x30008000, size = 0x001c0000 ... done                                                                           
zImage magic = 0x016f2818                         
Setup linux parameters at 0x30000100                                    
linux command line is: "noinitrd root=/dev/mtdblock/3  init= nuxrc console=ttySA                                                                                
C0 ,115200"           
MACH_TYPE = 193               
NOW, Booting Linux......                        
Uncompressing Linux.............................................................                                                                                
... done, booting the kernel.                             
Linux version 2.6.14 ([e-mail]) (gcc version 3.4.1) #1 Sat Aug                                                                                
 11 16:36:16 CST 2007                     
CPU: ARM920Tid(wb) [41129200] r                             
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                                                                    
S3C2410 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                 
Kernel command line: noinitrd root=/dev/mtdblock/3  init= nuxrc console=ttySAC0                                                                               
,115200       
irq: clearing subpending status 00000003                                        
irq: clearing subpending status 00000002                                        
PID hash table entries: 512 (order: 9, 8192 bytes)                                                  
timer tcon=00000000, tcnt a2c1, tcfg 00000200,00000000, usec 00001eb8                                                                     
Console: colour dummy device 80x30                                  
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)                                                              
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)                                                            
Memory: 64MB = 64MB total                         
Memory: 62720KB available (1620K code, 32                                        
Mount-cache hash table entries: 512                                   
CPU: Testing write buffer coherency: ok                                       
softlockup thread 0 started up.                               
NET: Registered protocol family 16                                  
S3C2410: Initialising architecture                                  
usbcore: registered new driver usbfs                                    
usbcore: registered new driver hub                                  
S3C2410 DMA Driver, (c) 2003-2004 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                                 
NetWinder Floating Point Emulator V0.97 (double precision)                                                          
Console: switching to colour frame buffer device 80x25                                                      
fb0: Virtual frame buffer device, using 1024K of video memory                                                             
S3C2410 RTC, (c) 2004 Simtec Electronics                                        
s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2410                                                          
s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2410                                                          
s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2410                                                          
io scheduler noop registered                            
io scheduler anticipatory registered                                    
io scheduler deadline registered                                
io scheduler cfq registered                           
RAMDISK driver initialized: 16 RAM disks of 4096K size                                                       
S3C24XX NAND Driver, (c) 2004 Simtec Electronics                                                
s3c2410-nand: mapped registers at c4980000                                          
s3c2410-nand: timing: Tacls 10ns, Twrph0 40ns, Twrph1 10ns                                                          
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":
0x00000000-0x00020000 : "vivi"
0x00020000-0x00030000 : "param"
0x00030000-0x001f0000 : "kernel"
0x00200000-0x00600000 : "root"
0x00600000-0x04000000 : "user"
usbmon: debugfs is not available
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 2, 16384 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
TCP bic registered
NET: Registered protocol family 1
Please press Enter to activate this console.
Starting pid 714, console /dev/console: '/bin/sh'

BusyBox v0.60.3 (2002.05.13-08:36+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
#
网卡驱动的移植：
1、把cs8900.c和cs8900.h两个针对2.6.14的内核的驱动程序源代码，将其放在drivers/net/arm/目录下面。
#cp cs8900.c ./drivers/net/arm/
#cp cs8900.h ./drivers/net/arm/
并在cs8900_probe()函数中，memset (&priv,0,sizeof (cs8900_t));函数之后添加如下两条语句：
__raw_writel(0x2211d110,S3C2410_BWSCON);
__raw_writel(0x1f7c,S3C2410_BANKCON3);
2、修改drivers/net/arm/目录下的Kconfig文件，在最后添加如下内容：
Config ARM_CS8900
tristate "CS8900 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.
内核系统配置文件由2.4版本的config.in变成了2.6版本Kconfig文件，在这个文件里面添加如上内容，则在运行make menuconfig或者make xconfig命令的时候就会出现：
[ ] CS8900 support 
这一选项。
3、修改drivers/net/arm/目录下的Makefile文件，在最后添加如下内容：
obj-$(CONFIG_ARM_CS8900) += cs8900.o
2.6版本内核的Makefile文件也与2.4版本的有所不同。添加以上语句，就会使内核在编译的时候根据配置将cs8900A的驱动程序以模块或静态的方式编译到内核当中。
4、在/arch/arm/mach-s3c2410/mach-smdk2410.c文件中，找到smdk2410_iodesc[]结构数组，添加如下如下内容：{vSMDK2410_ETH_IO, 0x19000000, SZ_1M, MT_DEVICE}
修改之后变成了：
static struct map_desc smdk2410_iodesc[] __initdata = {
/* nothing here yet */
/* Map the ethernet controller CS8900A */ {vSMDK2410_ETH_IO, 0x19000000, SZ_1M, MT_DEVICE}
};
添加#include <asm-arm/arch-s3c2410/smdk2410.h>
由于在驱动程序的开发的时候，在驱动程序当中所用到的跟设备有关的地址都是虚拟地址，也就是说驱动程序操作的都是虚拟地址，那么要使驱动程序对设备的操作反映到设备上去，就得将设备的物理地址映射到正确的虚拟地址上去，从而保证驱动程序对虚拟地址的操作也就是对相应的物理地址操作。以上添加的语句就是为了将网卡的物理地址(0x19000000)映射到vSMDK2410_ETH_IO所指向的虚拟地址上去，上面的结构还定义了网卡虚拟地址所占用的区间，也就是从vSMDK2410_ETH_IO开始的SZ_1M大小的去间，并指定了该区间所指向的域（的属性）。
5、在include/asm-arm/arch-s3c2410/目录下创建smdk2410.h文件，其内容为：
#ifndef _INCLUDE_SMDK2410_H_
#define _INCLUDE_SMDK2410_H_
#include <linux/config.h>
#define pSMDK2410_ETH_IO 0x19000000
#define vSMDK2410_ETH_IO 0xE0000000
#define SMDK2410_ETH_IRQ IRQ_EINT9
#endif // _INCLUDE_SMDK2410_H_
因为在网卡驱动程序当中，用到了一些常量，所以特意在此添加这个头文件。这个头文件定义了网卡的物理地址、虚拟地址以及网卡占用的中断线。
6、配置、编译内核。在内核顶层目录当中键入：
#make smdk2410_defconfig
由于2.6的内核默认就支持了S3C2410，所以就有一个默认的内核配置文件。里面只是包括了一个简单的配置，要使网卡编译进内核，还要进行手工配置。
#make menuconfig
Networking support ---> 
Ethernet (10 or 100Mbit) --->
[*] CS8900 support 
将刚才添加的网卡驱动程序静态添加到内核当中。
最后进行内核编译。
#make