Ls1046nfs mount file system

For embedded Linux Development , adopt NFS Mount the root file system , The root file system does not need to be downloaded to FLASH（FLASH You also need to erase before writing ）, Can be saved directly in Linux host , And in Linux The developed driver does not need to be downloaded to Linux Development board FLASH, This makes development very convenient and fast , The passage is recorded below NFS The process of mounting the root file system .
linux Modification on virtual machine ：
1） open /etc/exports, The content in the edit is

/home/nfs *(rw,sync,insecure,no_root_squash,no_all_squash,no_subtree_check)

2） Re open nfs

/etc/init.d/nfs-kernel-server restart

3） stay /home/nsf Put into file system

4) modify ls1046ardb_boot.scr file
Input boot Command to start the kernel , The device will execute an additional startup script ：/boot/ls1046ardb_boot.scr

The script is located on the development board /dev/mmcblk0p2 Medium /boot Under the table of contents , The script will be rewritten during execution bootargs environment variable , This leads to the user setting before bootargs Will be covered , The system will not be able to mount the root file system from a user-defined location .
ls1046ardb_boot.scr Is a binary program , among ：
The source file is located in ：flexbuild/configs/board/ls1046ardb/manifest
Compile generated .scr The file is located in ：flexbuild/build/firmware/u-boot/ls1046ardb/ls1046ardb_boot.scr
The compile command is ：flex-builder -i mkdistroscr -a arm64 -m ls1046ardb
Where is the source file mainfest Medium and startup settings bootargs What's relevant is ：

setenv bootargs console=ttyS0,115200 earlycon=uart8250,mmio,0x21c0500 root=PARTUUID=$partuuid3 
rw rootwait board_name=$board_name serdes1=$serdes1 $othbootargs;

Put setenv bootargs Delete , Then recompile to generate .scr Program , And update it to the development board emmc The partition 2（ The equipment is ：/dev/mmcblk0p2） Of boot Under the table of contents . In this way, we will uboot The command set in will not be rewritten .

5） In the development board u-boot Stage settings bootargs environment variable

=>setenv bootargs 'console=ttyS0,115200 earlycon=uart8250,mmio,0x21c0500 root
fstype=nfsroot root=/dev/nfs nfsroot=192.168.8.10:/home/nfs,proto=tcp,nfsvers=3,nolock 
ip=192.168.8.46:192.168.8.10:192.168.8.1:255.255.255.0::eth1:off 
board_name=$board_name serdes1=$serdes1 $othbootargs'
=>saveenv

192.168.8.10 by ubuntu The server ip,192.168.8.46 For development board ip, Guarantee two ip In the same network segment ping All right , stay uboot The default network port used in the phase is fm1-mac3, At this stage, the network interface is named eth1, This cannot be written as fm1-mac3.
After restart nfs Mount the root file system

stay /home/nfs Created in aaa Folder

You can see that the root directory of the development board appears aaa Folder ,nfs Mount successfully