AT91RM9200开发板上成功移植linu2.6.21

一、获得 linux kernel 源码及相应硬件的 patch
1.下载 linux 2.6.21内核源代码。
在 www.kernel.org 上下载 linux-2.6.21.tar.gz
2.下载 for at91rm9200 patch。
在 www.maxim.org.za/AT91ARM9200/2.6/
下载 2.6.21-at91.patch.gz
二、解压文件并给内核源代码打补丁
在根目录下使用命令：
mkdir  /emmett/2.6
把上面第一个文件拷贝到该目录下
tar zxvf  linux-2.6.21.tar.gz
cd linux-2.6.21
把2.6.21-at91.patch.gz拷贝到linux-2.6.21
zcat  2.6.21-at91.patch.gz｜patch p1
三、修改Makefile文件配置并编译内核
 查找到如下:
ARCH               ?= $(SUBARCH)
CROSS_COMPILE?=
 修改为:
ARCH               ?= arm
CROSS_COMPILE   ?= /usr/local/arm/3.4.1/bin/arm-linux-
然后在命令终端运行
# make at91rm9200dk_defconfig
#make menuconfig
添加和裁减相应的配置
#make
后就生成了zImage文件
[root@Linux boot]# pwd
/emmett/2.6/linux-2.6.21/arch/arm/boot
[root@Linux boot]# ls
bootp  compressed  Image  install.sh  Makefile  zImage
[root@Linux boot]#
四、烧写内核到flash即可
在开发板上启动信息也贴出来：
U-Boot 0.4.0 (Apr 27 2005 - 19:26:55)

U-Boot code: 21F00000 -> 21F143A8  BSS: -> 21F22478
DRAM Configuration:
Bank #0: 20000000 32 MB
SST: SST39VF3201 (32Mbit)
SST: SST39VF3201 (32Mbit)
Flash:  8 MB
In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0
## Starting application at 0x20008000 ...
Uncompressing Linux............................................................................. done, booting the kernel.
Linux version 2.6.21 (root@Linux) (gcc version 3.4.1) #1 Mon Aug 27 11:49:47 CST 2007
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
Machine: Atmel AT91RM9200-DK
Warning: bad configuration page, trying to continue
Memory policy: ECC disabled, Data cache writeback
Clocks: CPU 179 MHz, master 59 MHz, main 18.432 MHz
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.  Total pages: 8128
Kernel command line: mem=32M console=ttyS0,115200 initrd=0x21000000,3145728 root=/dev/ram0 rw
AT91: 128 gpio irqs in 4 banks
PID hash table entries: 128 (order: 7, 512 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 32MB = 32MB total
Memory: 26896KB available (2164K code, 210K data, 100K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
checking if image is initramfs...it isn't (no cpio magic); looks like an initrd
Freeing initrd memory: 3072K
NetWinder Floating Point Emulator V0.97 (double precision)
io scheduler noop registered
io scheduler anticipatory registered (default)
at91_spi: Baud rate set to 5990400
AT91 SPI driver loaded
AT91 Watchdog Timer enabled (5 seconds, nowayout)
atmel_usart.0: ttyS0 at MMIO 0xfefff200 (irq = 1) is a ATMEL_SERIAL
atmel_usart.1: ttyS1 at MMIO 0xfffc4000 (irq = 7) is a ATMEL_SERIAL
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
at91_ether: Your bootloader did not configure a MAC address.
eth0: Link now 100-FullDuplex
eth0: AT91 ethernet at 0xfefbc000 int=24 100-FullDuplex (00:00:00:00:00:00)
eth0: Davicom 9161 PHY (Copper)
physmap platform flash device: 00200000 at 10000000
Found: SST 49LF080A
physmap-flash.0: Found 2 x8 devices at 0x0 in 16-bit bank
number of JEDEC chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
RedBoot partition parsing not available
at91_cf: irqs det #64, io #0
usbmon: debugfs is not available
at91_ohci at91_ohci: AT91 OHCI
at91_ohci at91_ohci: new USB bus registered, assigned bus number 1
at91_ohci at91_ohci: irq 23, io mem 0x00300000
usb usb1: Product: AT91 OHCI
usb usb1: Manufacturer: Linux 2.6.21 ohci_hcd
usb usb1: SerialNumber: at91
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
udc: at91_udc version 3 May 2006
mice: PS/2 mouse device common for all mice
at91_rtc at91_rtc: rtc core: registered at91_rtc as rtc0
AT91 Real Time Clock driver.
i2c /dev entries driver
at91_i2c at91_i2c: AT91 i2c bus driver.
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
at91_rtc at91_rtc: setting the system clock to 1998-01-01 00:00:19 (883612819)
RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem).
Freeing init memory: 100K
init started:  BusyBox v1.2.1 (2007.07.30-14:37+0000) multi-call binary
eth0: Setting MAC address to 00:0a:1b:7e:bc:20
eth0: Link now 100-FullDuplex


BusyBox v1.2.1 (2007.07.30-14:37+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

# Jan  1 00:00:31 (none) syslog.info syslogd started: BusyBox v1.2.1
ls
ls
bin         etc         linuxrc     mnt         sbin        usr
dev         lib         lost+found  proc        tmp         var