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c04d2860e8
These are some minor updates from walking through the session myself. * Add some context to the `entry.S` slide, which is otherwise a bit terrifying for someone who does not speak ARM assembly. * Include a simple, fake example of MMIO. * Add a "Using It" section to the minimal UART segment, parallel to the better UART * Better explanation of the `unwrap` calls in the logging example. Unwrap is never "unsafe", so remove that word. * Allow dead code in some `.rs` files. * Remove redundant warning about use of memory before MMU setup. * Rephase text about buddy-system * Fix lint warning in spin slide.