Linux下USB烧写uImage kernel
1.启动开发板，进入u-boot：（如果开发板中没有系统，可以通过用SD卡方式启动开发板进入）
U-Boot 2011.06 (Mar 19 2012 - 08:45:34) for MINI6410
CPU: S3C6400@667MHz
Fclk = 667MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)
Board: MINI6410
DRAM: 256 MiB
NAND: 512 MiB
MMC: SAMSUNG SD/MMC: Host controler CH0
SD card is SD_VERSION_2
SD/MMC size : 3911680 block * 512B = 1910MB
Video: no Video params found, try bootargs~~ 640x480x24 31kHz 59Hz
[petworm] video_hw_init: <640, 480, 640, 480>
Error: Bad gzipped data
Error: no valid bmp or bmp.gz image at 57500000
In: serial
Out: serial
Err: serial
Net: dm9000
Hit any key to stop autoboot: 3
2.按任意键进入命令行状态后，运行dnw命令，文件存放地址作为参数传入（十六进制）：
MINI6410 # dnw 50008000
Insert a OTG cable into the connector!
3.插入USB电缆，连接主机和开发板，minicom会出现如下提示：
USB Cable is Connected
Now, Waiting for DNW to transmit data
4.另开一个终端，加载secbulk驱动：
sudo insmod secbulk
5.建立secbulk驱动设备节点(通过试验，可跳过此步)：
sudo mknod /dev/secbulk0 c 102 0
6.运行dnw程序，将欲传送的uImage的带路径的文件名作为参数传入:
sudo ./dnw uImage_a70 #(我们选择当前目录下的uImage_a70文件)
回车后传输开始，直至传送完毕。Minicom端提示如下：
Now, Waiting for DNW to transmit data
Download Done!! Download Address: 0x50008000, Download Filesize:0x40de8
Checksum is being calculated.
Checksum O.K.
主机端提示如下：
liwei@liwei:~/Desktop/dnw_linux/dnw$ sudo ./dnw uImage_a70
file name : uImage_a70
file size : 3763296 bytes
Writing data...
100% 3763306 bytes OK
此时，文件传送完毕，且校验正确。这时我们就可以用u-boot命令来将文件写入相应
的nandflash地址中：
MINI6410 # nand erase 80000 400000
NAND erase: device 0 offset 0x80000, size 0x400000
Erasing at 0x460000 -- 100% complete.
OK
MINI6410 # nand write 50008000 80000 400000
NAND write: device 0 offset 0x80000, size 0x400000
4194304 bytes written: OK
7.将S2调整到NAND启动位置，重启开发板后从NandFlash读取内核到内存，运行结
果如下：
U-Boot 2011.06 (Mar 16 2012 - 13:58:27) for MINI6410
CPU: S3C6400@667MHz
Fclk = 667MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)
Board: MINI6410
DRAM: 256 MiB
NAND: 512 MiB
MMC: SAMSUNG SD/MMC: Host controler CH0
No SD/MMC card detected!
No MMC card for env!
Using default environment
Video: no Video params found, try bootargs~~ 640x480x24 31kHz 59Hz
[petworm] video_hw_init: <640, 480, 640, 480>
No SD/MMC card detected!
Video: No MMC card for background image!
In: serial
Out: serial
Err: serial
Net: dm9000
Hit any key to stop autoboot: 0
MINI6410 # nand read 50008000 80000 400000
NAND read: device 0 offset 0x80000, size 0x400000
4194304 bytes read: OK
8.从内存中启动内核：
MINI6410 # bootm 50008000
## Booting kernel from Legacy Image at 50008000 ...
Image Name: petworm
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3763232 Bytes = 3.6 MiB
Load Address: 50008000
Entry Point: 50008040
Verifying Checksum ... OK
XIP Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Initializing cgroup subsys cpu
Linux version 2.6.38-FriendlyARM (root@jensen) (gcc version 4.5.1 (ctng-1.8.1-F1
CPU: ARMv6-compatible processor [410fb766] revision 6 (ARMv7), cr=00c5387f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: MINI6410
。。。 。。。
至此，Linux下用USB电缆烧写uImage成功完成！
附：
我们可以通过使用u-boot自带的mkimage命令来将zImage转换为uImage文件，命令如下：
mkimage -A arm -O linux -T kernel -C none -a 0x50008000 -e
0x50008040 -n "image-name" -d zImage_a70 uImage_a70
此命令将zImage_a70文件转换为uImage_a70文件，镜像的名称为image-name。
