Re: [Bug-xorriso] ISO installer image: GPT versus MBR partitions

[pelzflorian (Florian Pelz)]

On Sun, Apr 21, 2019 at 02:27:10PM +0200, Thomas Schmitt wrote:
> Hi,
> 
> i wrote:
> > > ... 3f  0b
> > > ... 40  0b
> > > ... ==  ==
> 
> Florian Pelz wrote:
> > Why is 0b underlined?
> 
> Too much enthusiasm on my side.
> 
> 
> > OK, so I just wrote the Guix git master with ludo’s reproducibility
> > patches to a USB drive (boot gets stuck again) and then did:
> > sudo dd if=/dev/sdc2 of=mysdc2.img
> > When I open it with ghex, I find at position 446:
> >    80  00  00  04  01  24  4f  00  00  00  00  80  16  00  00  00
> 
> Pinching eyes ...
> 
> Bootable flag is set.
> Start C/H/S is 4/0/0. (x/y/1 is usual)
> Partition type is 1.
> End C/H/S is 1/36/15.
> Start LBA is 0x80000000 = 2,147,483,648.
> Block count is 0x16 = 22.
> 
> So what ever did you do to this mysdc2.img ?
> 
> 

Ooops I am sorry, it is not

80  00  00  04  01  24  4f  00  00  00  00  80  16  00  00  00

but

80  00  01  00  04  01  24  4f  00  00  00  00  80  16  00  00  00



> We need to ask at grub-devel. I have begun to compose a mail.
> You will be Cc-ed.
> Does guix-devel want to be Cc-ed ?
> 

Thank you for sending a mail at
https://lists.gnu.org/archive/html/grub-devel/2019-04/msg00099.html

Regards,
Florian