[gentoo-embedded] planning a flash DOM x86 embedded system

[Francisco Ares]

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