Hi.

I am planning to build a system to be deployed in a SATA flash disk, and most of the file system will be read-only. There will be a tempfs on /temp and a read-write partition for /var (perhaps a unionfs with the static part of /var and that read-write partition)

Is there any resources on how to do this using Gentoo?

There is already a development system with everything working as expected on the final system. But when I put it to a squashfs, the system boots with several errors, like when trying to write to /etc and /var.

Looking on the new issue regarding /usr and / being on a different partitions, I have found the file in /etc/initramfs.mounts. I have added the needed fstab entries to be mounted before the system switches to the real-root, (as the comments on top of this file claims) but there are still errors during boot.

Thanks
Francisco