mkimg used to create gpt image, problem booting

[Craig Rodrigues]

On Fri, Aug 22, 2014 at 1:45 PM, Marcel Moolenaar <marcel at xcllnt.net> wrote:
>
>> If I mdconfig the foo1.img disk image, and do a gpart show, I see:
>>
>> =>      3  1784944  md0  GPT  (872M)
>>        3       32    1  freebsd-boot  (16K)
>>       35  1784912    2  freebsd-ufs  (872M)
>>
>> Any idea what I am doing wrong?
>
> To the best of my knowledge, qemu is the thing you're
> doing wrong :-)

Hi,

I transferred foo1.img to a Mac with VirtualBox, converted it to VMDK
with "VBoxManage convertfromraw --format VMDK", and tried to boot it
in VirtualBox.
I got the same error as in QEMU.  It looks like /boot/loader runs,
but I cannot do "ls" to see the root file system.

I created another disk image with a GPT layout, but this time
using the FreeBSD bsdinstall inside a bhyve VM.

I noticed the following:

WORKING IMAGE BOOTS IN QEMU, CREATED WITH BSDINSTALL
=============================================
=>      34  10485693  md0  GPT  (5.0G)
        34       128    1  83bd6b9d-7f41-11dc-be0b-001560b84f0f  (64K)
       162   9959296    2  516e7cb6-6ecf-11d6-8ff8-00022d09712b  (4.7G)
   9959458    524288    3  516e7cb5-6ecf-11d6-8ff8-00022d09712b  (256M)
  10483746      1981       - free -  (991K)

DOES NOT BOOT IN QEMU, CREATED WITH MKIMG
===================================================
=>      3  1784944  md1  GPT  (872M)
        3       32    1  83bd6b9d-7f41-11dc-be0b-001560b84f0f  (16K)
       35  1784912    2  516e7cb6-6ecf-11d6-8ff8-00022d09712b  (872M)


I ran the following crazy experiment, just to see what would happen:

dd if=/dev/md1s2 of=/dev/md0s2 bs=8192

I then tried to boot the first image with QEMU, and it booted successfully,
with my UFS file system that I had previously created with makefs.

I'm not sure where to look for the problem.  I notice that
in the non-working image, the offset starts at block 3,
while in the working image, the offset starts at block 34.

Is that enough to make things not boot?

--
Craig