Hello,
I'd need the SD image I prepared for the xM to be supplied to people 
without them changing a single bit in it. Also, this avoids write failure 
with power supply failures and increases the life of the SD.
>From my understanding this can be done by mounting the rootfs as read-only 
at some point in the boot and writing any change to the RAM without making 
them persistent. But I'm not expert in the bootstrap process with Linux. 

The only similar case I know in detail so far is with Ubuntu 10.10 
https://ccrma.stanford.edu/~eberdahl/satellite/ and it has two uInitrd 
images for boot, one with aufs enable and the other without. They only 
differ in a couple of scripts and if one wants changes to be persistents it 
is enough to mv files in the boot partition in order for the bootloader to 
pick the right one.

Now, I'm using debian and the rcn-ee builds. Here the boot partition is 
different it uses initrd.img and zImage. I'm not sure what to do here since 
it is a different boot method. 
Are there any suggestions on how to reach my goal? Any simple solution, 
even performed with an init script after bootstrap would be fine as a 
starter.

Regards

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