剛開始調試程序的時候經常需要修改程序調試程序,這時候頻繁的下載代碼就比較麻煩,開發初期可以使用NFS的方式掛載根文件系統,這樣調試將非常方便,開發板配置nfs掛載根文件系統需要按如下配置內核:
1、配置網絡部分,主要是使能CONFIG_IP_PNP以在2中能夠看到Root file system on NFS選項
Networking support
Networking options
TCP/IP networking
[*]IP: kernel level autoconfiguration
[*] IP: DHCP support
[*] IP: BOOTP support
2、配置開啓nfs服務
File systems --->
Network File Systems --->
<*> NFS client support
[*] NFS client support for NFS version 3
[*] NFS client support for the NFSv3 ACL protocol extension
[*] NFS client support for NFS version 4 (EXPERIMENTAL)
[*] NFS client support for NFSv4.1 (DEVELOPER ONLY)
[*] Root file system on NFS
內核開啓nfs掛載根文件系統後,要相應的修改uboot的傳參配置內核以nfs掛載根文件系統:
3、在uboot中設置如下啓動參數(IP根據實際使用更改)
setenv bootargs root=/dev/nfs nfsroot=192.168.31.130:/home/tangtao/nfsdata/rootfs ip=192.168.31.10:192.168.31.130:192.168.31.1:255.255.255.0::eth0:off init=/linuxrc console=ttySAC2,115200