OpenWrt on 8/64 devices

You have a device with 8MB flash and/or 64MB RAM.
You have read and understood the 8/64 warning.
You have adjusted your expectations according to this warning.
You still want to install OpenWrt on your 8/64 device for

• training purposes only (soldering, OpenWrt, Linux in general); if it breaks, it breaks, it's no loss.
• basic, low level routing functions only

Now you are asking: What can I do?

Find answers below.

Version 25.12 works well with LuCi running. For example, RAM usage on RE200 is 77%, with around 1MB of flash remaining. Basic router functions work.

How can I work around the 8MB flash issue?

• build your own image 18.06/19.07 image with all possible space saving measures, or...
• ...use extroot (only if USB available)
  • no flash problems any more
  • “infinite”¹⁾ storage space available
  • install all the packages of the world, if you like
  • BUT: It's kind of pointless to have a bunch of large packages (VPN, etc.) stored in extroot, but no RAM to run them on.

Why should I build my own image rather than installing packages?

Building your own image compresses the packages you need to about half the size compared to installing them after you flash.

How can I work around the 64MB RAM issue?

• Don't use LuCI (For older releases, will not work at all, will be terribly slow, or will crash due to OOM)
• Don't use RAM hungry applications (will not work at all, will be terribly slow, or will crash due to OOM)

Add links to forum topics here that deal with 8/64 specific flash/RAM issues. Preferably link to topics that have a solution for these issues.

• ...add forum link here ...
• ...

Check out the community Builds section of the forum. Maybe someone created a special build which takes care of the 8/64 specific issues.

• https://forum.openwrt.org/c/community-builds-projects-packages/