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How to determine compute module model over rpiBoot

~~Hi, i need to setup a script to validate the raspberry hardware connected to a desktop PC, and im not sure how to go about it.~~
We are in an environment where we need to flash an OS + some goodies to a RPI module, and currently this is done using rpiBoot.
~~the current setup is:~~
~~start rpiboot - waiting for bcm...~~
plug in rpi over usb connection
~~mount the disk~~
configure/validate some partitioning
~~write our software to pi~~
~~validate~~
~~complete~~
Up until recently we have only worked with CM3 modules, so no need to double check the compute module type, but i want to be certain of the device hardware during this process, preferable between steps 3 and 4.
~~i have been doing some experiments myself, but all information online points to using feature that are not available without the raspberry actually running such as:~~
cat /sys/firmware/devicetree/base/model
cat /proc/cpuinfo
And looking around in the /boot folder doesn't provide me any obvious solution, since that seems to contain bcm... files for multiple version, as far as i can tell, so im not sure i can go by that somehow.
So "all" i need is a way to tell if the device mounted is a CM3, CM4, CM4S ( or CM5 in the future )
~~Any tips would be appreciated :)~~

I need to flash an OS + some goodies to a RPI module. Currently I am using rpiBoot for this, following these steps:
* start rpiboot - waiting for bcm...
* plug in rpi over usb connection
* mount the disk
* configure/validate some partitioning
* write the software to pi
* validate
* complete
Up until recently I have only worked with CM3 modules, so there's no need to double-check the compute module type. However, I want to be certain of the device hardware during this process - preferably right after mounting the disk. **How can I do this?**
I have been doing some experiments myself, but all information online points to using feature that are not available without the raspberry actually running such as:
```
cat /sys/firmware/devicetree/base/model
cat /proc/cpuinfo
```
I tried looking around in the `/boot` folder, but it seems to contain `bcm...` files for multiple versions, so that doesn't suggest an obvious solution.
How can I tell if the device that was mounted is a CM3, CM4, CM4S ( or CM5 in the future )?

raspbian filesystem