title: Read a specific memory address via /dev/mem from the command line
body: <p>For context, programming a driver to interact with an FPGA IP core on an embedded Linux (Yocto: krogoth) on a Xilinx board.</p>
  
  <p>For debugging purposes I would like to read out specific memory addresses from physical memory. /dev/mem looks promising. I wanted to ask how I can read out the value of a specific physical memory address from the command line. I was hoping for something along the lines of <code>cat /dev/mem 0x2000000</code> to read the byte at 0x2000000.</p>