title: Linux kernel architecture support timeline
body: <p>I would love if someone could precisely spell dates of introduction of each architecture (x86, alpha, sparc, arm, etc.) support in Linux kernel.</p>
  
  <p>I found this illustration for Debian Linux distribution:</p>
  
  <p><img src="https://i.stack.imgur.com/mcXUn.png" alt="enter image description here"></p>
  
  <p>However, I need data for plain Linux kernel, not Debian Linux.</p>