The function capacity on the async ReadNotFlash trait is not async: https://github.com/rust-embedded-community/embedded-storage/blob/master/embedded-storage-async/src/nor_flash.rs#L18

I'm trying to make a shared flash based on these traits and to do that I have an async mutex that needs to be locked. But I can't do that in a sync function.

It would also be solved by having the capacity be a constant. But there may be a good reason why it's not a constant already