Help with EROFS for specific test scenario

[Fred Lotter]

Hi,

In the context of this page:
https://erofs.docs.kernel.org/en/latest/merging.html

I am trying to experiment with EROFS where I want to try something crazy
like the following setup:

/dev/mmcblk0p3:
|
EROFS root image
|
--------
|
EROFS second image
|
--------

I wanted to have a primate root EROFS filesystem written at the start of a
partition. Then I would like to "append" files to the immutable root EROFS
filesystem, by adding a concatenated EROFS filesystem after the root
filesystem, with an external device reference pointing to the root EROFS
filesystem.

My idea in my head was then to boot the Linux kernel with something like:

root=/dev/mmcblk0p3 rootfstype=erofs
rootoptions=device=/dev/mmcblk0p3,offset=<root size>

1. Is it possible to have the "blobdevice" point to a complete EROFS
filesystem?

2. If yes, is there userspace support for creating this setup?

Kind Regards,
Fred
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