[arch-general] Editing grub for dual boot?

bill

18 Apr 2016 18 Apr '16

3:43 p.m.

Hello again!Thanks much for the warm welcome and good advice.I have another issue in that i seem unable to have both arch and ghost bsd on the same system/drive. If i install bsd last the boot manager sees but cannot boot arch. If i install arch last, grub doesn't see the bsd at all.Apparently i need to edit grub so as to point it to the second os. Does anyone have advice how to do so, or references to a wiki, etc? Any thanks!peace-bill

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Ralf Mardorf

18 Apr 18 Apr

4:04 p.m.

To boot FreeBSD I needed to add a chainloader to the Linux's grub.cfg. menuentry "FreeBSD"{ set root=(hd0,msdos1) chainloader +1 } Note, at least FreeBSD needs to be on a primary or GPT partition.

bill .

23 Apr 23 Apr

2:41 p.m.

Hi all, BSD is on a primary so that's not the issue. When i added this to grub.cfg it puts the bsd option in my grub at bootup, but when i select it i get the error "invalid signature." I tried replacing msdos1 with msdos3 since my bsd is on the third primary partition, but same result. I have checked the syntax several times. Does this error have to do with my placement within the file (near the end before memtest) or another error? Many thanks! peace -bill

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Date: Tue, 19 Apr 2016 01:04:36 +0200 From: silver.bullet@zoho.com To: arch-general@archlinux.org Subject: Re: [arch-general] Editing grub for dual boot?

To boot FreeBSD I needed to add a chainloader to the Linux's grub.cfg.

menuentry "FreeBSD"{ set root=(hd0,msdos1) chainloader +1 }

Note, at least FreeBSD needs to be on a primary or GPT partition.

Mauro Santos

2:46 p.m.

On 23-04-2016 22:41, bill . wrote:

...

Hi all,

BSD is on a primary so that's not the issue.

When i added this to grub.cfg it puts the bsd option in my grub at bootup, but when i select it i get the error "invalid signature." I tried replacing msdos1 with msdos3 since my bsd is on the third primary partition, but same result. I have checked the syntax several times. Does this error have to do with my placement within the file (near the end before memtest) or another error? Many thanks! peace -bill

...
Date: Tue, 19 Apr 2016 01:04:36 +0200 From: silver.bullet@zoho.com To: arch-general@archlinux.org Subject: Re: [arch-general] Editing grub for dual boot?

To boot FreeBSD I needed to add a chainloader to the Linux's grub.cfg.

menuentry "FreeBSD"{ set root=(hd0,msdos1) chainloader +1 }

Note, at least FreeBSD needs to be on a primary or GPT partition.

You might have to mark the partition as active/bootable and you might have to hide other partitions. It all depends on what the bsd is expecting to find in regards to partitions. I've never used it so I can't be of much help besides guesses. -- Mauro Santos

William Castro

25 Apr 25 Apr

1:13 a.m.

I have another guess. BSD uses partitions within partitions (it calls them "slices".) Check under the GRUB command line for anything funky like hd0,msdos1bsd1 or something. On Sat, Apr 23, 2016 at 2:46 PM, Mauro Santos wrote:

...

...
Hi all,

BSD is on a primary so that's not the issue.

When i added this to grub.cfg it puts the bsd option in my grub at bootup, but when i select it i get the error "invalid signature." I tried replacing msdos1 with msdos3 since my bsd is on the third primary

On 23-04-2016 22:41, bill . wrote: partition, but same result. I have checked the syntax several times. Does this error have to do with my placement within the file (near the end before memtest) or another error? Many thanks!

...
peace -bill

...
Date: Tue, 19 Apr 2016 01:04:36 +0200 From: silver.bullet@zoho.com To: arch-general@archlinux.org Subject: Re: [arch-general] Editing grub for dual boot?

To boot FreeBSD I needed to add a chainloader to the Linux's grub.cfg.

menuentry "FreeBSD"{ set root=(hd0,msdos1) chainloader +1 }

Note, at least FreeBSD needs to be on a primary or GPT partition.

You might have to mark the partition as active/bootable and you might have to hide other partitions.

It all depends on what the bsd is expecting to find in regards to partitions. I've never used it so I can't be of much help besides guesses.

-- Mauro Santos

Lukas Rose

18 Apr 18 Apr

4:05 p.m.

Did you try running # grub-mkconfig -o /boot/grub/grub.cfg or, for UEFI-GPT Mode (As per #Alternative install method): # grub-mkconfig -o /boot/efi/EFI/GRUB/grub.cfg after installing bsd? Often it recognizes other OSes on its own. If not, installing os-prober and running grub-mkconfig … Again might help. Regards, Lukas

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On 19 Apr 2016, at 00:43, bill wrote:

Hello again!Thanks much for the warm welcome and good advice.I have another issue in that i seem unable to have both arch and ghost bsd on the same system/drive. If i install bsd last the boot manager sees but cannot boot arch. If i install arch last, grub doesn't see the bsd at all.Apparently i need to edit grub so as to point it to the second os. Does anyone have advice how to do so, or references to a wiki, etc? Any thanks!peace-bill

Ed Hamilton

19 Apr 19 Apr

1:37 a.m.

Do you have os-prober installed? https://wiki.archlinux.org/index.php/GRUB says, in part: Dual-booting Tip: To have grub-mkconfig search for other installed systems, install os-prober. I used architect to install this time, and os-prober wasn't installed by default. On 04/18/2016 06:43 PM, bill wrote:

...

Hello again!Thanks much for the warm welcome and good advice.I have another issue in that i seem unable to have both arch and ghost bsd on the same system/drive. If i install bsd last the boot manager sees but cannot boot arch. If i install arch last, grub doesn't see the bsd at all.Apparently i need to edit grub so as to point it to the second os. Does anyone have advice how to do so, or references to a wiki, etc? Any thanks!peace-bill

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bill
bill .
Ed Hamilton
Lukas Rose
Mauro Santos
Ralf Mardorf
William Castro