These steps boot the image and allow you to see the changes
Boot the image: Boot the modified image in the QEMU emulator using this command:
$ runqemu qemux86
Verify the changes:
Log into the machine using root
with no password and then
use the following shell command to scroll through the console's boot output.
# dmesg | less
You should see the results of your printk
statements
as part of the output.