Latest revision as of 15:17, 28 March 2025

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DART-6UL - Flash Yocto images from network

Flashing a complete Yocto system from Network using TFTP & NFS

NOTES:

Please make sure your host system is ready to use TFTP/NFS. Use our Wiki if required: Yocto Setup TFTP/NFS
This is a concept Wiki. Please adapt it to your system and your requirements.
Android and Debian can be flashed in the same way.

Build minimal file system

To setup a build environment follow steps 1 & 3 of the Build Yocto from source code guide.
Then, append the following to the conf/local.conf file in your Yocto build directory:

IMAGE_INSTALL_append = " bash e2fsprogs-mke2fs tar mtd-utils imx-kobs mtd-utils-ubifs"

And build the image:

$ bitbake core-image-minimal

Create a root file system and copy files:

$ mkdir ~/flash_rootfs
$ sudo tar xf tmp/deploy/images/imx6ul-var-dart/core-image-minimal-imx6ul-var-dart.tar.gz -C ~/flash_rootfs
$ sudo cp tmp/deploy/images/imx6ul-var-dart/zImage /tftpboot
$ for f in tmp/deploy/images/imx6ul-var-dart/*.dtb; do if [[ -L $f ]] && [[ $f != *imx6ul-var-dart.dtb ]]; then sudo cp $f /tftpboot/; fi done
$ sudo rename 's/zImage-imx/imx/' /tftpboot/zImage-*.dtb

Edit /etc/exports. E.g.

$ sudo gedit /etc/exports

...and add the following line to it (replace <uname> with the actual username):

/home/<uname>/flash_rootfs    *(rw,sync,no_root_squash,no_all_squash,no_subtree_check)

Restart the NFS server:

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

Insert the recovery SD card into your host PC and copy the following files from it (assuming it is mounted at /media):

$ sudo cp -a /media/rootfs/opt/images ~/flash_rootfs/opt/
$ sudo cp /media/rootfs/usr/bin/*.sh  ~/flash_rootfs/usr/bin/

Boot the board, stop the autoboot to get to the U-Boot command line, and set the following environment variables:

=> setenv serverip <your host ip address>
=> setenv nfsroot /home/<your username>/flash_rootfs

# If you want to set the fdt file yourself, instead of using the default auto detection:
=> setenv fdt_file <relevant device tree>
=> setenv bootcmd 'run netboot'
=> saveenv
=> boot

On the target flash your system:

# install_yocto.sh

A complete system is flashed into the SOMs internal storage (NAND flash/eMMC).
Once the file system is built you can use it again and again to flash your DART-6UL.
You can update the images to use your images and/or customize install_yocto.sh to your requirements.

@@ Line 9: / Line 9: @@
 --> {{COMMON_YOCTO_VARS}} <!--
 --> {{PageHeader|{{#var:HARDWARE_NAME}} - Flash Yocto images from network}} {{DocImage|category1={{#var:HARDWARE_NAME}}|category2=Yocto}} __toc__
+{{#ifexist: {{#var:ROOTFS_COMP_TARBALL_EXT}} ||
+ {{#ifeq: {{KERNEL_VERSION_NEWER|{{#var:KERNEL_VER}}|6.6.23}} | true |
+  {{#vardefine:ROOTFS_COMP_TARBALL_EXT|rootfs.tar.zst}} <!-- Releases starting from Scarthgap (6.6.23) -->
+ |
+  {{#ifeq: {{KERNEL_VERSION_NEWER|{{#var:KERNEL_VER}}|6.1.22}} | true |
+   {{#vardefine:ROOTFS_COMP_TARBALL_EXT|tar.zst}}       <!-- Releases starting from Mickledore (6.1.22) -->
+   |
+   {{#vardefine:ROOTFS_COMP_TARBALL_EXT|tar.gz}}        <!-- Older than the statements above -->
+  }}
+ }}
+}}
 = Flashing a complete Yocto system from Network using TFTP &amp; NFS  =
@@ Line 21: / Line 33: @@
 Then, append the following to the conf/local.conf file in your Yocto build directory:
   {{#switch: {{#var:SOC_SERIES}} | am6 | imx8 | imx9=
-  IMAGE_INSTALL{{#var:YOCTO_OVERRIDE_PREFIX}}append = " bash e2fsprogs-mke2fs tar"
+  IMAGE_INSTALL{{#var:YOCTO_OVERRIDE_PREFIX}}append = " bash e2fsprogs-mke2fs tar dosfstools zstd"
 |#default=
   IMAGE_INSTALL{{#var:YOCTO_OVERRIDE_PREFIX}}append = " bash e2fsprogs-mke2fs tar mtd-utils imx-kobs mtd-utils-ubifs"
@@ Line 76: / Line 88: @@
 Boot the board, stop the autoboot to get to the U-Boot command line, and set the following environment variables:
+{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-AM62 |
+<pre>
+=> setenv serverip <HOST_IP_ADDRESS>                (replace <HOST_IP_ADDRESS> with the actual IP address of your host - run 'ifconfig' on the host to get it)
+=> setenv ipaddr <TARGET_IP_ADDRESS>                (replace <TARGET_IP_ADDRESS> with the IP address for the target)
+=> setenv image Image
+=> setenv fdtfile k3-am625-var-som-symphony.dtb
+=> setenv rootpath "/home/<user>/rootfs"            (replace <user> with the username on your host computer)
+=> setenv netargs 'setenv bootargs console=${console} ${optargs} root=/dev/nfs nfsroot=${serverip}:${rootpath},nolock,v3 rw ip=${ipaddr}:::::eth0'
+=> setenv netboot 'tftp ${loadaddr} ${image}; tftp ${fdtaddr} ${fdtfile}; run netargs; booti ${loadaddr} - ${fdtaddr}'
+=> setenv bootcmd 'run netboot'
+=> saveenv
+=> boot
+</pre>
+| <br>
   => setenv serverip <your host ip address>
   => setenv nfsroot /home/<your username>/flash_rootfs
-  If you want to set the fdt file yourself, instead of using the default auto detection:
+  # If you want to set the fdt file yourself, instead of using the default auto detection:
   => setenv fdt_file <relevant device tree>
   => setenv bootcmd 'run netboot'
   => saveenv
   => boot
+}}
 On the target flash your system:

Yocto Flash From Net: Difference between revisions

Latest revision as of 15:17, 28 March 2025

Contents

Flashing a complete Yocto system from Network using TFTP & NFS

Build minimal file system