Dualboot with Windows 7

Da Rock freebsd-questions at herveybayaustralia.com.au
Mon Mar 19 07:58:47 UTC 2012

On 03/19/12 17:49, Polytropon wrote:
> On Mon, 19 Mar 2012 08:29:22 +0100, David Demelier wrote:
>> On 19/03/2012 07:28, Polytropon wrote:
>>> On Sun, 18 Mar 2012 23:05:58 +0100, David Demelier wrote:
>>>> Hello,
>>>> I try to create a dualboot with Windows 7, I set up partitions like that :
>>>> ada0s1 ->   NTFS (windows recovery)
>>>> ada0s2 ->   NTFS (windows main partition)
>>>> ada0s3 ->   BSD
>>>> 	ada0s3a ->   freebsd-swap (3G)
>>>> 	ada0s3b ->   freebsd-ufs / (remaining space from drive)
>>> Erm... according to traditional partitioning, isn't
>>> the 'a' partition reserved for booting, 'b' for swap?
>>> I see you have installed everything into one / partition
>>> which technically is no problem and should work, but
>>> it's not on the boot partition.
>> You're right, but I made a mistake while writing, my a partition is /
>> and b is swap.
> Okay.
>>>> And then I let the installer complete the step, because FreeBSD didn't
>>>> let you (since 9.0) choose between the boot manager nothing was
>>>> installed and the boot directly goes to Windows 7.
>>> You need to install all the required stages for booting.
>>> If I understand the process correctly, the slice 's3' needs
>>> code to "branch" to the boot partition (which is supposed
>>> to be the 'a' partition), and the boot selector needs to
>>> be accessed from the "beginning of the disk" - you said
>>> you're using EasyBCD for this which is okay.
>> I followed the part 13.3.2 from
>> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/boot-blocks.html
>> I think this should be enough, isn't it? it says bsdlabel -B will
>> replace the boot1 and boot2 stage so all of them are installed.
> Looks correct.
>> Now the question is how to branch the a partition as the "boot partition" ?
> No need. As soon as the "branching" from ada0-"start" ->  ada0s3
> has been processed, the 'a' partition ada0s3a will be accessed
> as it is the boot partition. It will then continue stage 1 and 2
> and finally access the loader, which will load the kernel.
> In 13.3.2 it is explained as follows:
> 	They [Stage One, /boot/boot1, and Stage Two, /boot/boot2]
> 	are located outside file systems, in the first track of
> 	the boot slice, starting with the first sector. This is
> 	where boot0, or any other boot manager, expects to find
> 	a program to run which will continue the boot process.
> 	The number of sectors used is easily determined from the
> 	size of /boot/boot.
> In your case, the "boot slice" (for FreeBSD) is ada0s3 where the
> boot manager EasyBCD will "branch" to.
> Getting just a cursor (as you described) makes it hard to
> identify where the process hangs. If EasyBCD is the last
> thing you see, I assume the FreeBSD boot process isn't even
> initiated. Every part of it (MBR boot manager, boot0, boot1,
> boot2 and loader) would issue some kind of text when accessed.
I couldn't say exactly how to do this now (been a looooong time), but 
you should be able to boot using the Windows loader (this may have 
changed in recent editions. Don't think so though). This will give you a 
choice between Windows or FreeBSD and defaults, timers, etc during boot. 
Used to be able to do it under system properties I believe; run a google 
search should provide some examples.

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