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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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 Posted: Sat Feb 05, 2011 6:54 pm Post subject: grub-install : Unknown partition table signature |
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Hi guys,
Doing a:
| Code: | | grub-install --no-floppy /dev/sda |
on an ext4 boot partition results in a lot of "Unknown partition table signature" messages but it seems to complete and reports no errors.
If I do a manual grub install using:
| Code: | grub> root (hd0,0)
grub> setup (hd0)
grub> quit |
I don't get any errors or messages regarding the table signatres.
Is this a bug in grub?
Cheers. |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54847
Location: 56N 3W
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| Posted: Sat Feb 05, 2011 10:54 pm Post subject: |
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eponymous,
Its probably not a grub bug - it would be all over the forums if it were.
Be aware that (hd0) may not be /dev/sda.
(hd0) is the first drive discovered by the BIOS. /dev/sda is the first drive discovered by the kernel.
If you have more than one drive these need not be the same drive.
Some braindead BIOS's report the boot drive as (hd0), regardless of which drive it actually is, in which case, with 2 or more drives installed you may encounter the above BIOS 'feature'.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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| Posted: Sat Feb 05, 2011 11:40 pm Post subject: |
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| NeddySeagoon wrote: | eponymous,
Its probably not a grub bug - it would be all over the forums if it were.
Be aware that (hd0) may not be /dev/sda.
(hd0) is the first drive discovered by the BIOS. /dev/sda is the first drive discovered by the kernel.
If you have more than one drive these need not be the same drive.
Some braindead BIOS's report the boot drive as (hd0), regardless of which drive it actually is, in which case, with 2 or more drives installed you may encounter the above BIOS 'feature'. |
The thing is, I'm booting into my Gentoo install just fine :S
Is there any way to check which device hd0 actually is?
* UPDATE: Oh now this is really odd. I've just tried doing the exact same thing again (after making a tweak to my grub.conf to add a rootfs=ext4 line) and it worked fine without any error messages :S
I'm confused. |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54847
Location: 56N 3W
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| Posted: Sun Feb 06, 2011 9:30 pm Post subject: |
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eponymous,
That makes no sense. A grub doesn't care what your kernel root file system is unless /boot is not a real partition, then it has to read files from your kernel root. In any case, rootfs= is a kernel parameter.
"Unknown partition table signature" refers to the last two bytes in the MBR, which must be 0x0aa 0x55. Don't quote me on the order.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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| Posted: Sun Feb 06, 2011 10:54 pm Post subject: |
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| NeddySeagoon wrote: | eponymous,
That makes no sense. A grub doesn't care what your kernel root file system is unless /boot is not a real partition, then it has to read files from your kernel root. In any case, rootfs= is a kernel parameter.
"Unknown partition table signature" refers to the last two bytes in the MBR, which must be 0x0aa 0x55. Don't quote me on the order. |
Hi Neddy, sorry that is misleading. I didn't mean to imply that adding rootfs=ext4 solved the problem - I was merely stating what I had changed (to fix another problem) before I did another grub-install. |
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