Re: Booting from gpt on i386/amd64? [PATCH] - FreeBSD

This is a discussion on Re: Booting from gpt on i386/amd64? [PATCH] - FreeBSD ; On Sun, Aug 31, 2008 at 12:35:55PM +0200, Alexey Shuvaev wrote: > On Fri, Aug 29, 2008 at 11:16:07PM +0200, Paul B. Mahol wrote: > > On 8/29/08, Alexey Shuvaev wrote: > > > Hello list! > > > > ...

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Thread: Re: Booting from gpt on i386/amd64? [PATCH]

  1. Re: Booting from gpt on i386/amd64? [PATCH]

    On Sun, Aug 31, 2008 at 12:35:55PM +0200, Alexey Shuvaev wrote:
    > On Fri, Aug 29, 2008 at 11:16:07PM +0200, Paul B. Mahol wrote:
    > > On 8/29/08, Alexey Shuvaev wrote:
    > > > Hello list!
    > > >
    > > > I have tried to install a system with pure gpt partitioning,
    > > > but haven't managed to boot from it.
    > > >
    > > > Partition table:
    > > >
    > > > => 34 976773101 ad6 GPT (500.1GB)
    > > > 34 1571840 1 freebsd-ufs (804.8MB)
    > > > 1571874 8388608 2 freebsd-swap (4.3GB)
    > > > 9960482 1024 3 freebsd-boot (524.3KB)
    > > > 9961506 8388608 4 freebsd-ufs (4.3GB)
    > > > 18350114 524288 5 freebsd-ufs (268.4MB)
    > > > 18874402 134217728 6 freebsd-ufs (68.7GB)
    > > > 153092130 823681005 - free - (421.7GB)
    > > >
    > > > All necessary files are already installed (ad6p1 = /, ad6p4 = /var, and
    > > > so on). The system is 8.0-CURRENT from 8 August (bootable usb flash).
    > > > Computer is Core2Duo E8400 3.0 GHz, 4 Gb RAM, ICH9, 500 GB SATA.
    > > > What have been done:
    > > >
    > > > gpart bootcode -b /path/to/pmbr ad6
    > > > [Successful]
    > > >
    > > > gpart bootcode -p /path/to/gptboot -i 3 ad6
    > > > gpart: /dev/ad6p3: Invalid argument
    > > >
    > > > I have tried to 'newfs /dev/ad6p3' and then mounting it and copying
    > > > gptboot into 'boot' directory on ad6p3, but looking at the sources it
    > > > seems to be wrong.
    > > >
    > > > Then I tried to 'dd if=gptboot of=/dev/ad6p3 bs=512',

    > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    > This command writes gptboot only partially!!!
    > I have padded gptboot to nearest sector boundary and dd-ed it to ad6p3.
    > After that the system booted successfully.
    > As I have expected GENERIC kernel is enough.
    >
    > > > but in all cases during the boot the blinking cursor moves 1 line down
    > > > and computer freezes here.
    > > >

    > The remaining question is what is the correct way to put gptboot to
    > 'freebsd-boot' partition?
    > It seems that this functionality was in gpt(8) but is missing in
    > gpart(8). Any work in progress? While I am here should I look at it?
    >

    Ok, I have digged the sources a little bit and ended with this simple
    patch. Actually, the code is taken from gpt(8) utility.
    It adds automatic padding of gptboot bootcode to the nearest sector boundary.

    Alexey.

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  2. Re: Booting from gpt on i386/amd64? [PATCH]


    On Sep 19, 2008, at 7:26 PM, Alexey Shuvaev wrote:

    > Ok, I have digged the sources a little bit and ended with this simple
    > patch. Actually, the code is taken from gpt(8) utility.
    > It adds automatic padding of gptboot bootcode to the nearest sector
    > boundary.


    I think this is reasonable.

    --
    Marcel Moolenaar
    xcllnt@mac.com



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  3. Re: Booting from gpt on i386/amd64? [PATCH]

    On Sun, Sep 28, 2008 at 02:52:51PM -0700, Xin LI wrote:
    >
    > Hi, Marcel,
    >
    > Marcel Moolenaar wrote:
    > >
    > > On Sep 19, 2008, at 7:26 PM, Alexey Shuvaev wrote:
    > >
    > >> Ok, I have digged the sources a little bit and ended with this simple
    > >> patch. Actually, the code is taken from gpt(8) utility.
    > >> It adds automatic padding of gptboot bootcode to the nearest sector
    > >> boundary.

    > >
    > > I think this is reasonable.

    >
    > Could you please commit the proposed patch?
    >

    In order for this patch not to be lost I have filed a PR:
    http://www.freebsd.org/cgi/query-pr.cgi?pr=127922

    Alexey.
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