Merge branch 'omac777-master-patch-78777' into 'master'

Update ch02-04-preparing-the-build.md

See merge request !175

src/ch02-04-preparing-the-build.md

@@ -128,7 +128,7 @@ cd ~/tryredox/redox
 make fetch
 ```
 
-### Change Sources To Build ARM 64-bit Redox-Os Image
+### Change Sources To Build ARM 64-bit Redox OS Image
 WIP this section needs more work
 ```
 cd ~/tryredox/redox
@@ -143,6 +143,12 @@ git rev-parse HEAD
 git pull
 ```
 
+### Install Additional Tools To Build And Run ARM 64-bit Redox OS Image
+```
+sudo apt-get install u-boot-tools
+sudo apt-get install qemu-system-arm qemu-efi
+```
+
 Next steps
 ----------