Updates for Raspberrypi OS tutorials (#28)

Author: andre-richter

content/this-month/2020-10.md

@@ -46,11 +46,24 @@ In this section, we describe updates to personal projects that are not directly
 
 This month, ...
 
+### [`rust-embedded/rust-raspberrypi-OS-tutorials`](https://github.com/rust-embedded/rust-raspberrypi-OS-tutorials)
+
+<span class="gray">(Section written by [@andre-richter](https://github.com/andre-richter))</span>
+
+The [_Operating System development tutorials in Rust on the Raspberry Pi_](https://github.com/rust-embedded/rust-raspberrypi-OS-tutorials) project now provides [Tutorial 15 - `Virtual Memory Part 2: MMIO Remap`](https://github.com/rust-embedded/rust-raspberrypi-OS-tutorials/tree/master/15_virtual_mem_part2_mmio_remap).
+
+It introduces a first set of changes which are eventually needed for separating `kernel` and `user` address spaces:
+- The memory mapping strategy gets more sophisticated and no longer `identity maps` the _whole_ of the board's address space.
+- Instead, only ranges that are actually needed are mapped:
+    - The `kernel binary` stays `identity mapped` for now.
+    - Device `MMIO regions` are remapped lazily to a special virtual address region at the top of the virtual address space during the device driver's `init()`.
+
+
 ## Join Us?
 
 Are you interested in Rust-based operating system development? Our `rust-osdev` organization is always open to new members and new projects. Just let us know if you want to join! A good way for getting in touch is our [gitter channel](https://gitter.im/rust-osdev/Lobby).
 
 
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