backported from trunk.

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.8@15471 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/xcat/plugins/anaconda.pm

@@ -719,7 +719,7 @@ sub mknetboot
             $useifname=1;
             $kcmdline .= "ifname=".$reshash->{$node}->[0]->{primarynic}.":";
         }else{
-	    if( $arch=~ /ppc/)
+	    if($osver =~ /rhels5/ and $arch=~ /ppc/)
 	    {
      		$usemac=1;	
 	    }
@@ -1191,7 +1191,7 @@ sub mkinstall
                     "/$installroot/autoinst/" . $node,
                     $node,
 		            $pkglistfile,
-                    $pkgdir, 
+                    $pkgdir,
                     $platform,
                     $partfile
                     );