移植u-boot-2010.03 --- 使用tftp下载并运行内核

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.......