P6RXS1=$(devmem 0x1FB5C6A8)
P2RXS1=$(devmem 0x1FB5C248)

ping 192.168.1.100 -c 1

P6RXS2=$(devmem 0x1FB5C6A8)
P2RXS2=$(devmem 0x1FB5C248)

RXDIFF=$(($P6RXS2 - $P6RXS1))
TXDIFF=$(($P2RXS2 - $P2RXS1))

printf "RXDIFF: 0x%x TXDIFF: 0x%x\n" $RXDIFF $TXDIFF