-Fix problem where mknb failed to set up PPC structure properly

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@2702 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

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

@@ -118,6 +118,11 @@ sub process_request {
          }
          chmod(0644,"$tftpdir/pxelinux.0");
       }
+   } elsif ($arch =~ /ppc/) {
+      mkpath("$tftpdir/etc");
+      if (! -r "$tftpdir/yaboot") {
+          $callback->({error=>["Unable to locate yaboot to boot ppc clients, install yaboot-xcat"],errorcode=>[1]});
+      }
    }
    my $dopxe=0;
    foreach (keys %{$hexnets}) {