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Yocto Setup TFTP/NFS

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DART-MX8M - Yocto Setup TFTP/NFS

1 Running Yocto rootfs on Variscite board using TFTP & NFS

1.1 Host

Make sure you installed NFS server:

$ sudo apt-get install nfs-kernel-server
$ cd ~/var-fsl-yocto
$ sudo mkdir rootfs
$ cd rootfs
$ sudo tar xvf  ../build_xwayland/tmp/deploy/images/imx8m-var-dart/fsl-image-gui-imx8m-var-dart.tar.gz
$ sudo gedit /etc/exports

Add the following line (change <uname> to the name of user):

/home/<uname>/var-fsl-yocto/rootfs    *(rw,sync,no_root_squash,no_all_squash,no_subtree_check) 

exit & save

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

Make sure you installed TFTP server:

$ sudo apt-get install xinetd tftpd tftp
$ ls /usr/sbin/in.tftpd
$ sudo gedit /etc/xinetd.d/tftp
service tftp
protocol = udp
port = 69
socket_type = dgram
wait = yes
user = nobody
server = /usr/sbin/in.tftpd
server_args = /tftpboot
disable = no
$ sudo mkdir /tftpboot
$ sudo chmod -R 777 /tftpboot
$ sudo /etc/init.d/xinetd restart
$ cd ~/var-fsl-yocto//
$ cp tmp/deploy/images/imx8m-var-dart/Image.gz /tftpboot
$ cp tmp/deploy/images/imx8m-var-dart/Image.gz-imx*.dtb /tftpboot
$ sudo rename 's/Image.gz-//' /tftpboot/Image.gz-*.dtb
$ cd /tftpboot
$ ln -s imx8m-var-dart-dcss-lvds.dtb imx8m-var-dart.dtb
Default kernel configuration should be modified to compile Ethernet driver into kernel image instead compiling it as a loadable module.

Follow our kernel compilation guide Build kernel from source code
Run "make menuconfig", go to "Device Drivers → Network device support → Ethernet driver support → Freescale devices → FEC ethernet controller" and press y.

Compile the kernel and copy arch/arm64/boot/Image.gz to /tftpboot

1.2 Target

Make sure you have a serial connection to the target.

Reset and hold the space bar. This will bring you to U-Boot command line.

$ setenv serverip
$ setenv nfsroot /home/<uname>/var-fsl-yocto/rootfs (change <uname> to the name of user)
$ setenv bootcmd run netboot
$ saveenv 

You are all set. Connect Ethernet cable, power cycle the DART-MX8M and it should boot over NFS.