Shallow clone to save clone time and disk space

configure

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -ex
 y=''
 while getopts t OPT; do
   case "$OPT" in
@@ -8,6 +9,9 @@ while getopts t OPT; do
   esac
 done
 shift $(($OPTIND - 1))
+git submodule update --depth 1 --jobs 4 --init
+cd qemu
+git submodule update --init
 sudo apt-get update $y
 # Building SDL for QEMU in Buildroot was rejected upstream because it adds many dependencies:
 # https://patchwork.ozlabs.org/patch/770684/

getting-started.md

@@ -44,7 +44,7 @@ The only advantage of using your host machine is that you don't have to wait som
 
 Reserve 12Gb of disk:
 
-    git clone --recursive https://github.com/cirosantilli/linux-kernel-module-cheat
+    git clone https://github.com/cirosantilli/linux-kernel-module-cheat
     cd linux-kernel-module-cheat
     ./configure
     ./build