Not sure if this applies to real ARM boards, but in qemu, I get:
-bash-3.1# ping 10.0.2.2
PING 10.0.2.2 (10.0.2.2): 56 data bytes
64 bytes from 10.0.2.2: icmp_seq=0 ttl=255 time=12.391 ms
64 bytes from 10.0.2.2: icmp_seq=1 ttl=255 time=-1.774 ms
64 bytes from 10.0.2.2: icmp_seq=2 ttl=255 time=-1.683 ms
64 bytes from 10.0.2.2: icmp_seq=3 ttl=255 time=-1.688 ms
64 bytes from 10.0.2.2: icmp_seq=4 ttl=255 time=-1.712 ms
64 bytes from 10.0.2.2: icmp_seq=5 ttl=255 time=-1.657 ms
--- 10.0.2.2 ping statistics ---
6 packets transmitted, 6 packets received, 0% packet loss
round-trip min/avg/max/stddev = -1.774/0.646/12.391/5.253 ms
But we all know that time cannot go backwards.
