> Has anyone tried to use seL4 on a raspberry pi 4?

Yes, I am running seL4 on the Raspberry Pi 4 Model B. The project we are 
working has a userland that is not based on `seL4_libs` and friends, so I’m 
afraid we have no userland drivers to contribute upstream. However, we do have 
patches with the necessary kernel configuration and elfloader SMP 
initialization logic to get seL4 itself running on the Raspberry Pi 4 Model B.

Our project uses a different build system from upstream seL4 development, so 
our patches will require additional preparation before we can open a PR. For 
now, I’ll publish the patches in a public fork and then link to them in this 
thread.

- - - -
Nick Spinale (nickspinale.com)
Arm Research, Cambridge UK
- - - -

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