fix serial console on LinuxBIOS

diff -Nurp grub2/include/grub/i386/efi/machine.h grub2.serial/include/grub/i386/efi/machine.h
@@ -0,0 +1,24 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MACHINE_MACHINE_HEADER
+#define GRUB_MACHINE_MACHINE_HEADER	1
+
+#define GRUB_MACHINE_EFI	1
+
+#endif /* ! GRUB_MACHINE_MACHINE_HEADER */

diff -Nurp grub2/include/grub/i386/linuxbios/machine.h grub2.serial/include/grub/i386/linuxbios/machine.h
@@ -0,0 +1,24 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MACHINE_MACHINE_HEADER
+#define GRUB_MACHINE_MACHINE_HEADER	1
+
+#define GRUB_MACHINE_LINUXBIOS	1
+
+#endif /* ! GRUB_MACHINE_MACHINE_HEADER */

diff -Nurp grub2/include/grub/i386/pc/machine.h grub2.serial/include/grub/i386/pc/machine.h
@@ -0,0 +1,24 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MACHINE_MACHINE_HEADER
+#define GRUB_MACHINE_MACHINE_HEADER	1
+
+#define GRUB_MACHINE_PCBIOS	1
+
+#endif /* ! GRUB_MACHINE_MACHINE_HEADER */

diff -Nurp grub2/include/grub/powerpc/ieee1275/machine.h grub2.serial/include/grub/powerpc/ieee1275/machine.h
@@ -0,0 +1,24 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MACHINE_MACHINE_HEADER
+#define GRUB_MACHINE_MACHINE_HEADER	1
+
+#define GRUB_MACHINE_IEEE1275	1
+
+#endif /* ! GRUB_MACHINE_MACHINE_HEADER */

diff -Nurp grub2/include/grub/sparc64/ieee1275/machine.h grub2.serial/include/grub/sparc64/ieee1275/machine.h
@@ -0,0 +1,24 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MACHINE_MACHINE_HEADER
+#define GRUB_MACHINE_MACHINE_HEADER	1
+
+#define GRUB_MACHINE_IEEE1275	1
+
+#endif /* ! GRUB_MACHINE_MACHINE_HEADER */

diff -Nurp grub2/term/i386/pc/serial.c grub2.serial/term/i386/pc/serial.c
@@ -16,6 +16,7 @@
  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <grub/machine/machine.h>
 #include <grub/machine/serial.h>
 #include <grub/machine/console.h>
 #include <grub/term.h>

@@ -63,13 +64,18 @@ struct serial_port
 /* Serial port settings.  */
 static struct serial_port serial_settings;
 
+#ifdef GRUB_MACHINE_PCBIOS
+/* The BIOS data area.  */
+static const unsigned short *serial_hw_io_addr = (const unsigned short *) 0x0400;
+#else
+static const unsigned short serial_hw_io_addr[] = { 0x3f8, 0x2f8 };
+#endif
+
 /* Return the port number for the UNITth serial device.  */
 static inline unsigned short
 serial_hw_get_port (const unsigned short unit)
 {
-  /* The BIOS data area.  */
-  const unsigned short *addr = (const unsigned short *) 0x0400;
-  return addr[unit];
+  return serial_hw_io_addr[unit];
 }
 
 /* Fetch a key.  */