Re: [Qemu-devel] Booting a guest with OVMF

[Kashyap Chamarthy <kchamart@redhat.com>]

On Tue, Jun 10, 2014 at 07:30:58PM +0200, Laszlo Ersek wrote:
> On 06/10/14 19:16, Kashyap Chamarthy wrote:

[. . .]

> > 
> > Yes, I can, but will have to wait till tomorrow -- the contents of the
> > script came down to 1.6G after trying to make an ISO as below.
> > 
> >     $ sudo dd bs=1k if=/dev/sdb2 of=fed-min2.iso conv=sparse
> 
> (1) I think you should just format the disk image into a regular file,
> rather than dumping it to a USB stick, 

Assuming I'm reading you correctly, the above script writes the OS
content directly to USB stick, I didn't dump to it from a disk image
file.

> and then dumping it back from there.
> 
> (2) Even if you opt for the USB "detour", the above dd command line is
> incorrect. You selected a specific partition on the USB stick as input
> block device. That's wrong, we need to see the entire disk (partition
> table, EFI system partition etc).

You're right (sdb1 has "EFI System"):

    $ sudo fdisk -l /dev/sdb
    
    Disk /dev/sdb: 3.7 GiB, 4004511744 bytes, 7821312 sectors
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: gpt
    Disk identifier: C6CEC927-FA8F-4958-A223-A7BCE283241E
    
    Device           Start          End   Size Type
    /dev/sdb1         2048      1046527   510M EFI System
    /dev/sdb2      1048576      7819263   3.2G unknown


I'll do a redump of /dev/sdb as below:

    $ sudo dd bs=1k if=/dev/sdb of=fed-min.iso conv=sparse

Thanks for pointing that out.

-- 
/kashyap