From: "H. Peter Anvin" <hpa@zytor.com>
To: Bill Davidsen <davidsen@tmr.com>
Cc: berk walker <berk@panix.com>, Doug Ledford <dledford@redhat.com>,
Janek Kozicki <janek_listy@wp.pl>,
linux-raid@vger.kernel.org
Subject: Re: switching root fs '/' to boot from RAID1 with grub
Date: Sun, 04 Nov 2007 10:02:15 -0800 [thread overview]
Message-ID: <472E0927.4000701@zytor.com> (raw)
In-Reply-To: <472D4A86.3090700@tmr.com>
Bill Davidsen wrote:
>
> I don't understand your point, unless there's a Linux bootloader in the
> BIOS it will boot whatever 512 bytes are in sector 0. So if that's crap
> it doesn't matter what it would do if it was valid, some other bytes
> came off the drive instead. Maybe Windows, since there seems to be an
> option in Windows to check the boot sector on boot and rewrite it if it
> isn't the WinXP one. One of my offspring has that problem, dual boot
> system, every time he boots Windows he has to boot from rescue and
> reinstall grub.
>
> I think he could install grub in the partition, make that the active
> partition, and the boot would work, but he tried and only type FAT or
> VFAT seem to boot, active or not.
>
The Grub-promoted practice of stuffing the Linux bootloader in the MBR
is a bad idea, but that's not the issue here.
The issue here is that the bootloader itself is capable of making the
decision to reject a corrupt image and boot the next device. The Linux
kernel, unfortunately, doesn't have a sane way to do that.
-hpa
prev parent reply other threads:[~2007-11-04 18:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-30 20:07 switching root fs '/' to boot from RAID1 with grub Janek Kozicki
2007-10-30 20:37 ` Janek Kozicki
2007-10-30 22:01 ` Doug Ledford
2007-10-31 15:01 ` Janek Kozicki
2007-10-31 17:38 ` Doug Ledford
2007-10-31 20:12 ` xosview + RAID (was: switching root fs '/'...) Janek Kozicki
2007-10-31 20:47 ` xosview + RAID David Greaves
2007-11-01 17:31 ` switching root fs '/' to boot from RAID1 with grub H. Peter Anvin
2007-11-01 18:30 ` Doug Ledford
2007-11-01 18:57 ` H. Peter Anvin
2007-11-02 15:55 ` Doug Ledford
2007-11-01 19:04 ` Janek Kozicki
2007-11-01 19:20 ` Doug Ledford
2007-11-02 16:36 ` berk walker
2007-11-04 3:18 ` Bill Davidsen
2007-11-04 3:44 ` H. Peter Anvin
2007-11-04 4:28 ` Bill Davidsen
2007-11-04 18:02 ` H. Peter Anvin [this message]
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