CM4 Android 11 - making persistent changes to ueventd.rc

tohox

Hi,


I'm developping an app which accesses the hardware directly and requires access to /dev/i2c-2. For the app to work I need to set /dev/i2c-2 access permissions to 666. I currently do this via:

1. chmod 666 /dev/i2c-2

Copy code

this works OK but it is not persistent and has to be repeated after each reboot.

My understanding is that I can accomplish the same by modfying ueventd.rc but the file is currently read-only as it is on a ramdisk wich gets mounted from an image file at boot time.

I don't know where this image file is located or if it is possible to modify it.

Any ideas?

Thanks!

tohox

So it turns out I was missing a step...

After doing: adb root
I also had to do an: adb remount

Which will remount /system and /vendor as read/write allowing changes. Then I am able to edit and save changes to /vendor/ueventd.rc which already contains an inscription for /dev/i2c-2...

So there was no need to play around with the boot image file.

Hope this helps someone!