This test appears to check that a target has an interrupt named "sh_cmt.0",
and that it is running (/proc/interrupts increments over a 5-second period), and is assigned IRQ number 174.

This looks like something very specific to some Renesas lager board.

= Details =

This test unpacks a tarball called: dung-3.4.25-m2.tar.gz
It runs the following scripts on target:
 * cmt/cmt-interrupt.sh
 * cmt/dmesg.sh
 * cmt/proc-interrupts.sh

then checks that the log contains "Test passed" exactly
$FUNCTIONAL_CMT_LINES_COUNT times

This variable is not defined (would have been nice to test it earlier
than in test_processing).  I thought maybe another board file would
have this, but it appears not to.

== cmt/cmt-interrupt.sh ==
This script uses common/interrupt-count.sh to measure the number of occurrences
of the 'sh_cmt.0' interrupt over a period of 5 seconds.

If the value is increasing, then it emits "Test passed"

== cmt/dmesg.sh ==
This script uses common/dmesg.sh to search for the following string:
 "sh_cmt sh_cmt.0: used for clock events" in the dmesg output

== cmt/proc-interrupts.sh ==
This script uses common/proc-interrupts.sh to check for the
'sh_cmt.0' interrupt, and see if it matches 174.

If the value matches, then it emits "Test passed"