Kernel labs: suggest to use LZO compression and add reference to our …

…boot time course

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

labs/kernel-compiling-and-nfs-booting/kernel-compiling-and-nfs-booting.tex

@@ -87,6 +87,11 @@ \section{Kernel configuration}
 Make sure that this configuration has \kconfigval{CONFIG_ROOT_NFS}{y} (support
 booting on an NFS exported root directory).
 
+To save about 1 second every time you boot or reboot, as shown in our
+\href{https://bootlin.com/training/boot-time}{Embedded Linux Boot Time
+Optimization course}, you can also replace LZMA kernel compression by LZO
+compression (\kconfig{CONFIG_KERNEL_LZO}).
+
 \section{Kernel compiling}
 
 Compile your kernel and generate the Device Tree Binaries (DTBs)