移植u-boot-2010.03 --- 使用tftp下载并运行内核

在解决了u-boot网卡驱动后，其实就可以通过tftp下载内核，并运行内核

1，查看系统参数

WU_SMDK6410 # printenv

bootargs=console=ttySAC,115200

bootcmd=nand read 0x50008000 0x100000 0x500000;bootm 0x50008000

bootdelay=10

baudrate=115200

ethaddr=00:40:5c:26:0a:5b

ipaddr=192.168.1.123

serverip=192.168.1.127

gatewayip=192.168.1.1

netmask=255.255.255.0

stdin=serial

stdout=serial

stderr=serial

ethact=dm9000

检查地址，保证能连通主机的tftp,前文有提到过，这里不再说明方法。

2，下载内核

保证主机上的tftp服务器已经正常启动。并且在tftp根目录下有编译好的uImage镜像文件

WU_SMDK6410 # tftp uImage

dm9000 i/o: 0x18800300, id: 0x90000a46 

DM9000: running in 16 bit mode

MAC: 00:40:5c:26:0a:5b

operating at 100M full duplex mode

Using dm9000 device

TFTP from server 192.168.1.127; our IP address is 192.168.1.123

Filename 'uImage'.

Load address: 0x50000000

Loading: T T #################################################################

         ###########################################

done

Bytes transferred = 1575472 (180a30 hex)

3，运行内核

WU_SMDK6410 # bootm

## Booting kernel from Legacy Image at 50000000 ...

   Image Name:   Linux-3.12.7

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    1575408 Bytes =  1.5 MB

   Load Address: 50008000

   Entry Point:  50008000

   Verifying Checksum ... OK

   Loading Kernel Image ... OK

OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Booting Linux on physical CPU 0x0

Linux version 3.12.7 (wu@wu-VirtualBox) (gcc version 4.4.3 (ctng-1.6.1) ) #1 Tue Jan 21 17:10:55 CST 2014

CPU: ARMv6-compatible processor [410fb766] revision 6 (ARMv7), cr=00c5387d

CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache

Machine: OK6410

Memory policy: ECC disabled, Data cache writeback

CPU S3C6410 (id 0x36410101)

.......省略.......