How to create an application partition img

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

hi ,
I am trying to separate our app from filesystem image and put them into separated emmc partition. I created a directory which host a few App binary after cross compiling on the host. I want to covert this directory into a image file like system.img so that i can modify flash.sh to flash into the emmc. ( note i have already modified the partition table xml file to add a App partition) the only thing i am missing is that to make the directory into img binary.

Thanks

3

hello terry8uwg2,

please check Flash Script Usage session,
how about using -G options to reads the boot partition and saves the image to the specified file.
thanks

4

Hey Jerry,

I have few app binaries and other config file .I want to create a image file for example App.img which will include these app binaries and config file. i want flash App.img separately not together with system.img.

5

hello terry8uwg2,

how about create a deb package to include them,
for example, https://linuxconfig.org/easy-way-to-create-a-debian-package-and-local-package-repository.

6

deb package still install the actual file into file system partition. i just tried something like this
# dd if=/dev/zero of=~/app.img bs=1024k count=1024
# losetup --find --show ~/file.img
/dev/loop0
# mkfs -t ext4 /dev/loop0
# mount /dev/loop0 /mnt
# cp the bin files to /mnt
# umount /dev/loop0
# losetup --detach /dev/loop0

then i modified the partition table to flash app.img. after system boot up i can directly mount this partition. any comments ?

Thanks

7

hello terry8uwg2,

may I know what’s your actual use-case,
thanks

8

hey Jerry,

I want to be able to flash the new Application independently at the factory and also in the runtime ota update session . I want to be able to update this partition without touching the system partitions. we are supporting various build flavor . so trying to separate them.

9

hello terry8uwg2,

okay, it looks like you’ll need some implementation to have dual APP partition.
you may have update flash configuration file to have couple of APP partitions (i.e. APP_1, and APP_2 ).

please also check similar discussion thread, Topic 76624, and Topic 81894 for reference,
thanks