Dear all,

The first of these terms has an... interesting history. In a nutshell, it's not 
always used appropriately. Clearly that's not going to be the case with SEL4, 
but what exactly is meant?

Mixed critical is another term that I'm cautious over. It's not completely 
clear to me if the mixing refers to relaxed constraints for utilisation reasons 
or something else.

(Correct me if I'm mistaken, but I don't think SEL4 implements FLASK, which 
would be the obvious way to provide differing constraints, relaxed constraints 
within the trusted computing model. It's totally the wrong level.)

I have absolutely no doubt SEL4 will retain all the provable integrity ever 
claimed (by anyone involved), but this experimental-proto-main branch confuses 
me on what fundamentally changes.

Jonathan Day
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