Update README.md

mm/README.md

@@ -4,3 +4,4 @@ This chapter describes memory management in the linux kernel. You will see here
 couple of posts which describe different parts of the linux memory management framework:
 
 * [Memblock](https://github.com/0xAX/linux-insides/blob/master/mm/linux-mm-1.md) - describes early `memblock` allocator.
+* [Fix-Mapped Addresses and ioremap](https://github.com/0xAX/linux-insides/blob/master/mm/linux-mm-2.md) - describes `fix-mapped` addresses and early `ioremap`.