This test appears to check that a target has an interrupt named "arch_timer",
and that it is running (/proc/interrupts increments over a 5-second period), and is assigned IRQ number 27.

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

= Details =

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

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

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

== arch_timer-interrupt-lager.sh ==
This script uses common/interrupt-count.sh to measure the number of occurrences
of the arch_timer interrupt over a period of 5 seconds.

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

== dmesg-lager.sh ==
This script uses common/dmesg.sh to search for the following string:
 "ARM arch timer >56 bits at 10000kHz" in the dmesg output

== proc-interrupts-lager.sh ==
This script uses common/proc-interrupts.sh to check for the
arch_timer interrupt, and see if it matches 27.

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