title: Changing the PCIe BAR size
body: <p>Can somebody tell me how to increase the bar size (like by using setpci or some other way)?</p>
  <p>I am able to read the BAR register and also able to determine the size of it. But what if i want to expand or contract the BAR size? For example : BAR 4 is prefetchable and size is &quot;1M&quot;.
  What if i wanna expand it to 16M ?</p>
  <p>I am able successfully to do with the driver , but what if i wanna do it without the help of driver (like using setpci, as we can edit BAR register values ).</p>