title: what does 'low memory' mean in linux
body: <p>HI I'm Korean and getting little confused on "The boot program first copies itself to a fixed high-memory address to free up low memory for the operating system".</p>
  
  <p>What I know about low memory that I found by googling was that this is first 640K memory in DOS system. Does this means all of the OS system (like kernel) goes in to low memory (640K) ????</p>
  
  <p>Thanks for reading this.</p>