From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with archive (Exim 4.43)
	id 1HXDYF-0002UK-Fw
	for mharc-grub-devel@gnu.org; Fri, 30 Mar 2007 05:37:43 -0400
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1HXDYD-0002U6-9S
	for grub-devel@gnu.org; Fri, 30 Mar 2007 05:37:41 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1HXDYC-0002To-DV
	for grub-devel@gnu.org; Fri, 30 Mar 2007 05:37:40 -0400
Received: from [199.232.76.173] (helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1HXDYC-0002Tj-Am
	for grub-devel@gnu.org; Fri, 30 Mar 2007 04:37:40 -0500
Received: from mx07.ms.so-net.ne.jp ([202.238.82.7])
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <h-ozeki@ck2.so-net.ne.jp>) id 1HXDVV-0007Jt-Dz
	for grub-devel@gnu.org; Fri, 30 Mar 2007 05:34:53 -0400
Received: from temjin (pddf855.gifunt01.ap.so-net.ne.jp [218.221.248.85])
	by mx07.ms.so-net.ne.jp  with ESMTP id l2U9YbV5027515
	for <grub-devel@gnu.org>; Fri, 30 Mar 2007 18:34:43 +0900 (JST)
From: "Hitoshi Ozeki" <h-ozeki@ck2.so-net.ne.jp>
To: "'The development of GRUB 2'" <grub-devel@gnu.org>
Date: Fri, 30 Mar 2007 18:34:29 +0900
Message-ID: <000001c772ae$a4fa46d0$030010ac@temjin>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.6822
Importance: Normal
Thread-Index: AcdxbtZb8nloLKgWSO2dDa5xepMQRABPQMmQ
In-Reply-To: <200703282125.06774.okuji@enbug.org>
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028
X-detected-kernel: Solaris 9.1
Subject: i386-pc 'chainloader' is something wrong. (RE: I write a patch for
	Japanese NEC i386 old computers.)
X-BeenThere: grub-devel@gnu.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: The development of GRUB 2 <grub-devel@gnu.org>
List-Id: The development of GRUB 2 <grub-devel.gnu.org>
List-Unsubscribe: <http://lists.gnu.org/mailman/listinfo/grub-devel>,
	<mailto:grub-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/grub-devel>
List-Post: <mailto:grub-devel@gnu.org>
List-Help: <mailto:grub-devel-request@gnu.org?subject=help>
List-Subscribe: <http://lists.gnu.org/mailman/listinfo/grub-devel>,
	<mailto:grub-devel-request@gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 30 Mar 2007 09:37:41 -0000

Hello,

I wrote:
> * When doing 'chainloader' command, the all disk devices cannot use =
via
> 'dev.c',
>   because of doing 'grub_loader_unload_func'  on 'grub_loader_set'.
>   I think it is disirable to do 'grub_loader_unload_func' on
'grub_*_boot'.

Okuji-san wrote:
> Could you elaborate on why this is bad?

At first, excuse me. 'grub_loader_unload_func' is not bad.
Please see 'grub-1.96/loader/i386/pc/chainloader.c' and
 'grub-1.96/kern/loader.c'

When we execute the 'boot' command, process the 'grub_loader_boot()'
--------------------------------------------------
grub_loader_boot (void)
{
  if (! grub_loader_loaded)
    return grub_error (GRUB_ERR_NO_KERNEL, "no loaded kernel");

  if (grub_loader_noreturn)
    grub_machine_fini (); <--- includes 'grub_biosdisk_fini()'
 =20
  return (grub_loader_boot_func) ();  <--- call the
'grub_chainloader_boot()'
}
--------------------------------------------------

And 'grub_loader_boot()' passes to 'grub_chainloader_boot()'

--------------------------------------------------
grub_chainloader_boot (void)
{
  grub_device_t dev;
  int drive =3D -1;
  void *part_addr =3D 0;
 =20
  /* Open the root device.  */
  dev =3D grub_device_open (0);  <--- Ouch! Cannot open device!
  if (dev)
    {
      grub_disk_t disk =3D dev->disk;
--------------------------------------------------     =20

I experience this trouble during my work,
 so 'grub_chainloader_boot()' doesn't open the root device in PC-9800 =
patch.