I have experience flashing images built with imx-image-full to SD cards.
However, I’m not sure how to flash an image to emmc.
Which part of the wiki does this fall under?
http://ess-wiki.advantech.com.tw/view/IoTGateway/BSP/Linux/iMX8/Yocto_LBVC_User_Guide#Build_U-Boot_in_standalone_environment
Also, do you know how to make it a read-only file system except for /etc and /home/root?
I’m in the process of looking into this using yocto kirkstone’s overrayfs and overrayfs-etc based on the following site.
https://mickey-happygolucky.hatenablog.com/entry/2022/12/02/032345
Hi~
Please check the wiki user guide: Reflash EMMC from Boot SD CARD
Yocto Linux BSP Ver.C User Guide for iMX8 series -Yocto 4.0 - ESS-WIKI (advantech.com.tw)
Hi @Jems_Cheng
Thank you for your information.
I didn’t think there was a way to flash it on another wiki.
http://ess-wiki.advantech.com.tw/view/RSB-3720_user_guide
It can reference the Yocto menu to create a Read-only Root Filesystem.
https://docs.yoctoproject.org/dev/dev-manual/read-only-rootfs.html
For areas with write access, that can reference 30.3.
Data written in /tmp or /var will be volatile.
I forgot to mention that the written data must also be retained even after the power is turned off.
Also, the data may be rewritten while the power is on.
Hi~
According to the Linux file system hierarchy standard, regardless of whether rootfs is set to read-only, the data stored in the /tmp directory may be deleted every time the system is started.
You want to write to a rootfs (partition) that has been set to read-only, which is a conflicting operation. I think it can only be written after you set up read/write, or it can add an extra place to store the retained data. The following example creates mmcblk1p3 for writing and persisting data in a read-only rootfs.
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