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Re: Assistance with non-bios found HDD/cdrom booting

From: Felix Zielcke
Subject: Re: Assistance with non-bios found HDD/cdrom booting
Date: Fri, 22 Jan 2010 19:21:09 +0100

Am Donnerstag, den 21.01.2010, 06:11 +1100 schrieb Nando:
> Hi Grub team,
> I have connected a HDD to my optical drive port and find that Ubuntu
> can see and mount that HDD. However, I'd like to be able to boot from
> it. If I do:
> 'ls'
> -> shows hd0..
> 'insmod ata_pthru'
> 'insmod ntfs'
> 'ls'
> -> shows ata0.. + additional partitions
> set prefix=(ata0,1)/boot/grub
> Problem is the sequence required to boot the Ubuntu or Windows
> partitions off the shown ataxx partitions. I understand that Windows
> may need bios INT10/INT13 services to boot, but Ubuntu does not. Can
> anyone list the command sequence to boot Ubuntu off an ataxx ('insmod
> ata' or 'insmod ata_pthru') non bios found IDE device?

It's exactly the same as from a hdX,Y one.
But you need to run `boot' command after `linux' and `initrd' from the
commandline. It's only done automatically in menu entries.

> I have also tried sbootmgr.dsk finding it sees the devices but upon
> selecting the Ubuntu drive/partition off the optical port, it reboots
> the system. 
> Any advice on how this can be done using grub2?

I don't know sbootmgr.dsk.

> Nando

Felix Zielcke
Proud Debian Maintainer and GNU GRUB developer

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