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Re: Test Proposal for [bug #46716] Protective MBR partition is not marke
From: |
Andrei Borzenkov |
Subject: |
Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable |
Date: |
Mon, 21 Dec 2015 21:46:16 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 |
21.12.2015 10:45, Thomas Schmitt пишет:
> Hi,
>
> Andrei Borzenkov wrote:
>> MBR is created with 512B sector size but when GRUB is booted
>> from CD-ROM sector size is 2KiB.
>
> Ain't that a bug ?
>
What exactly?
> GPT is recognized with 512. El Torito is recognized with its
> weird mix of 512 for size and 2048 for block addresses.
> The reason why APM is recorded with size 2048 is originally
> not CD compatibility but the wish to combine APM and GPT.
> (Else, the first APM entry and the GPT header would collide.)
>
> Would it be possible that GRUB2 applies the feature of
> self-identifying block size, in order to get MBR partitions
> to the same level of support as GPT ?
I do not see how it can be done.
> (I never found traces of MBR block size other than 512. So one
> could set 512 as soon as partition type "msdos" is detected.
> I assume that "msdos" is recognized by the MBR magic number
> at bytes 510, 511 anyway.)
>
Yes, that may be an option. Still, using GPT is known to work; and those
implementations I am aware of ignore MBR if partition 0xee is present.
So it still looks like adding dummy bootable partition to MBR is the
least evil. I wonder how Mac will present it.
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, (continued)
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Andrei Borzenkov, 2015/12/21
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Andrei Borzenkov, 2015/12/21
- Re: [Bug-xorriso] Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Alexander E. Patrakov, 2015/12/21
- Re: [Bug-xorriso] Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Andrei Borzenkov, 2015/12/20
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/20
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/20
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Andrei Borzenkov, 2015/12/20
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/21
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable,
Andrei Borzenkov <=
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/21
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Alexander E. Patrakov, 2015/12/21
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/21
- Re: [Bug-xorriso] Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Andrei Borzenkov, 2015/12/24
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/27
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/27
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/27
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/28
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Alexander E. Patrakov, 2015/12/29
- Re: Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable, Thomas Schmitt, 2015/12/29