Run on Beagle Board:

case 1:
    root@omap:/home/ubuntu/tom# ./kmem_mem /boot/System.map-3.0.4-x3
    found jiffies at (0xc0870080) c0870080
    /dev/kmem read buf = 319317
    jiffies=319317 (read from virtual memory)

    /dev/mem: the offset is 870080
    the page size = 4096
    mmap: Invalid argument



case 2:
    root@omap:/home/ubuntu/tom# ./kmem_mem /boot/System.map-3.0.4-x3 
    found jiffies at (0xc0870080) c0870080
    /dev/kmem read buf = 333631
    jiffies=333631 (read from virtual memory)

    /dev/mem: the offset is 870080
    /dev/mem read failed: Bad address
    jiffies=0 (read from physical memory)