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Re: ISO installer image: GPT versus MBR partitions
From: |
Thomas Schmitt |
Subject: |
Re: ISO installer image: GPT versus MBR partitions |
Date: |
Sun, 21 Apr 2019 13:16:14 +0200 |
Hi,
i plan to ask at gru-devel about mformat, its MBR, and the partition entry,
as soon as the last experiment is made (LBA 1 rather than LBA 0 as start
of the inner partition).
For that discussion i could also need the exact model name of the Macbook.
If its EFI has a name, then this too.
Florian Pelz wrote:
> +--- grub-2.02/util/grub-mkrescue.c 2019-04-21 08:17:18.880000000 +0200
> ++++ grub-2.02/util/grub-mkrescue.c 2019-04-21 08:17:52.588000000 +0200
> [...]
> +- { "mformat", "-C", "-f", "2880", "-L", "16",
> ++ { "mformat", "-k", "-C", "-f", "2880", "-L", "16",
The difference between the contents of the first image block with and
without option -k is significant, at least if we ask program "file".
If a special version of gub-mkrescue is acceptable, then i would rather
propose to apply the dd treatment to efiimgfat after mformat created
it without option -k.
We could ask at grub-devel for advise how to write 16 bytes to that file
without needing another shell command. (It's C language, after all.)
The binary differences between both blocks 0, except partition entry, are:
/efi.img from Guix 0.16.0
#########################
Image from mformat -k
00000000 : eb 3c 90 4d 54 4f 4f 34 30 32 31 00 02 01 01 00
### ### ### ### ### ### ### ### ### ### ###
00000000 : 00 00 00 00 00 00 00 00 00 00 00 00 02 01 01 00
00000020 : 00 00 00 00 00 00 29 a7 48 66 33 4e 4f 20 4e 41
### ### ### ###
00000020 : 00 00 00 00 00 00 29 42 87 4b 7d 4e 4f 20 4e 41
00000030 : 4d 45 20 20 20 20 46 41 54 31 32 20 20 20 fa 31
### ###
00000030 : 4d 45 20 20 20 20 46 41 54 31 32 20 20 20 00 00
00000040 : c0 8e d8 8e c0 fc b9 00 01 be 00 7c bf 00 80 f3
### ### ### ### ### ### ### ### ### ### ### ### ###
00000040 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000050 : a5 ea 56 00 00 08 b8 01 02 bb 00 7c ba 80 00 b9
### ### ### ### ### ### ### ### ### ### ### ###
00000050 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000060 : 01 00 cd 13 72 05 ea 00 7c 00 00 cd 19 00 00 00
### ### ### ### ### ### ### ### ###
00000060 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
...
000001f0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa
### ###
000001f0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Have a nice day :)
Thomas
- Re: ISO installer image: GPT versus MBR partitions, (continued)
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/20
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions,
Thomas Schmitt <=
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/21
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/22
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/23
- Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/23
- Re: ISO installer image: GPT versus MBR partitions, Ludovic Courtès, 2019/04/17
- Re: ISO installer image: GPT versus MBR partitions, pelzflorian (Florian Pelz), 2019/04/17
Re: ISO installer image: GPT versus MBR partitions, Thomas Schmitt, 2019/04/23