| 1 |
On Wed, May 12, 2010 at 4:47 PM, Mick <michaelkintzios@×××××.com> wrote: |
| 2 |
> On Wednesday 12 May 2010 21:47:41 Paul Hartman wrote: |
| 3 |
>> On Wed, May 12, 2010 at 3:00 PM, Mick <michaelkintzios@×××××.com> wrote: |
| 4 |
>> > On Monday 10 May 2010 17:01:02 Paul Hartman wrote: |
| 5 |
>> >> On Sat, May 8, 2010 at 9:16 AM, claude angéloz |
| 6 |
>> >> |
| 7 |
>> >> <claude.angeloz@×××××××.ch> wrote: |
| 8 |
>> >> > Hello, |
| 9 |
>> >> > |
| 10 |
>> >> > I installed a gentoo on a very recent system (efi support) . AT the |
| 11 |
>> >> > reception of the laptop it was a disk label msdos, with a boot |
| 12 |
>> >> > partition w** installer ... I changed that against a GPt disk label. |
| 13 |
>> >> > I can install without problem the gentoo , but now it doenst boot. |
| 14 |
>> >> > |
| 15 |
>> >> > I read some docs about gpt,mbr,boot principles and tried some tools |
| 16 |
>> >> > |
| 17 |
>> >> > - install the grub2 masked package and grub-install. |
| 18 |
>> >> > |
| 19 |
>> >> > - a special partion bios_grub as 1st bootable partition. |
| 20 |
>> >> > but actually no succesful... |
| 21 |
>> >> > but in the parted i did not see this "bios_grub" as flag... |
| 22 |
>> >> > |
| 23 |
>> >> > I found some tips from the web , but i guess that was only valid for |
| 24 |
>> >> > a macintel system, not a normal pc with a disk labeled gpt and an efi |
| 25 |
>> >> > support. |
| 26 |
>> >> > |
| 27 |
>> >> > I know that it is not required an efi partiton to boot the os with |
| 28 |
>> >> > pc/bios and gpt disk. Or is it false ? |
| 29 |
>> >> > |
| 30 |
>> >> > If anybody has an other idea. Or I must abandon the gpt disk label ? |
| 31 |
>> >> > Is there an equivalent refitr in OS x86 ? |
| 32 |
>> >> |
| 33 |
>> >> I'm using GPT partitions and with the grub-0.97-r9 in Gentoo it has |
| 34 |
>> >> patches to boot from GPT disks. I just did normal grub install as |
| 35 |
>> >> usual and everything seems to work. I'm not using the partition label, |
| 36 |
>> >> though, but only "root (hd0,0)" |
| 37 |
>> > |
| 38 |
>> > Interesting. Does grub install its bootloader into the MBR, or in a GPT |
| 39 |
>> > boot partition? I am not at all familiar with this new way of booting |
| 40 |
>> > systems. |
| 41 |
>> |
| 42 |
>> I think basically GPT is a replacement for MBR, everything basically |
| 43 |
>> works the same way otherwise. GPT has features like redunancy, removes |
| 44 |
>> limits of MBR (no primary/logical designation anymore, no 2TB limit, |
| 45 |
>> etc). I think it has a somewhat MBR-compatible layout in the first |
| 46 |
>> sector so non-GPT-aware things can still partially recognize it. |
| 47 |
> |
| 48 |
> Am I right to assume that your 1st partition on the 1st disk is the GPT boot |
| 49 |
> partition and therefore its 1st sector is what would on a conventional disk be |
| 50 |
> the MBR? |
| 51 |
|
| 52 |
From the standpoint of the fake MBR table, I think you are correct. To |
| 53 |
non-GPT-aware utils it'll look like GPT is a partition of some type |
| 54 |
but when using GPT-compatible things that is completely transparent. |
| 55 |
Wikipedia has a good description of how it all works under the hood, |
| 56 |
check out the LBA-0 section of the article here: |
| 57 |
http://en.wikipedia.org/wiki/GUID_Partition_Table |
| 58 |
|
| 59 |
From a normal user's perspective, creating the partitions and |
| 60 |
installing grub was no different than with MBR, only I told parted to |
| 61 |
great GPT instead of MBR partition table on my new disks. Enabled EFI |
| 62 |
in kernel, used Gentoo's version of grub which has the GPT patches |
| 63 |
included, and everything just worked. Maybe I was lucky? :) |
Archives