Dualboot with Windows 7

Leslie Jensen leslie at eskk.nu
Mon Mar 19 17:05:04 UTC 2012

2012-03-19 08:53, Da Rock skrev:
> 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.

Using EasyBCD you must ensure that your Windows partition has the boot 
flag set.


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