linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / Documentation / DocBook / deviceiobook.tmpl

diff --git a/Documentation/DocBook/deviceiobook.tmpl b/Documentation/DocBook/deviceiobook.tmpl
index 90ed23d..6f41f2f 100644 (file)
--- a/Documentation/DocBook/deviceiobook.tmpl
+++ b/Documentation/DocBook/deviceiobook.tmpl
@@ -270,6 +270,25 @@ CPU B:  spin_unlock_irqrestore(&dev_lock, flags)
       </para>
     </sect1>
 
+    <sect1>
+      <title>ISA legacy functions</title>
+      <para>
+       On older kernels (2.2 and earlier) the ISA bus could be read or
+       written with these functions and without ioremap being used. This is
+       no longer true in Linux 2.4. A set of equivalent functions exist for
+       easy legacy driver porting. The functions available are prefixed
+       with 'isa_' and are <function>isa_readb</function>,
+       <function>isa_writeb</function>, <function>isa_readw</function>, 
+       <function>isa_writew</function>, <function>isa_readl</function>,
+       <function>isa_writel</function>, <function>isa_memcpy_fromio</function>
+       and <function>isa_memcpy_toio</function>
+      </para>
+      <para>
+       These functions should not be used in new drivers, and will
+       eventually be going away.
+      </para>
+    </sect1>
+
   </chapter>
 
   <chapter>