|Subject:||Re: [Qemu-discuss] UEFI, OVMF Qemu example|
|Date:||Tue, 5 Aug 2014 12:59:36 +0000|
Indeed the offset was incorrect (as well as the size…) It is now working for me.
"losetup --offset 34" is incorrect: the offset is 34 sectors (17408 bytes) instead of 34 bytes.
BTW, kpartx can be used to access partitions on a loop device:
kpartx -a /dev/loopX
After running the command above, device files like /dev/maper/loopXp1 or /dev/loopXp1 would appear, which can be format/mount directly.
On Sat, Aug 2, 2014 at 4:37 AM, Bradley, Mike <address@hidden> wrote:
I’m trying to create a qemu example to boot a UEFI program, with the goal of it calling a baremetal program. But, I’m stuck in getting the UEFI program to run as I want.
Also, I assume this is the correct way to do this (e.g. UEFI runs, calls my UEFI program, which will then jump to baremetal).
Currently, I have tianocore installed, and have built the HelloWorld example.
I can successfully do:
% file hda/x64/HelloWorld.efi
hda/x64/HelloWorld.efi: MS-DOS executable
% qemu-system-x86_64 -bios OVMF.fd -enable-kvm -hda fat:hda/x64
The UEFI boot shell comes up, and I can execute “HelloWorld”.
But, I want to boot this automatically, without having to type in the UEFI shell. I found a recommendation to create a disk image summary:
% dd if=/dev/zero of=$dname bs=512 count=200
% gdisk disk.hdd
… options to create partition
% gdisk -l disk.hdd
GPT fdisk (gdisk) version 0.8.9
Partition table scan:
BSD: not present
APM: not present
Found valid GPT with protective MBR; using GPT.
Disk disk.hdd: 200 sectors, 100.0 KiB
Logical sector size: 512 bytes
Disk identifier (GUID): F076CC86-0ABB-4D59-A188-4923F7415030
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 166
Partitions will be aligned on 2-sector boundaries
Total free space is 0 sectors (0 bytes)
Number Start (sector) End (sector) Size Code Name
1 34 166 66.5 KiB EF00 EFI System
% losetup --offset 34 --sizelimit 159000 /dev/loop0 disk.hdd
% mkdosfs /dev/loop0
% mkdir -p efi
% mount /dev/loop0 efi
% mkdir -p efi/EFI/BOOT/
% cp HelloWorld.efi efi/EFI/BOOT/BOOTX64.EFI
Then run qemu:
% qemu-system-x86_64 -bios OVMF.fd -enable-kvm -hda disk.hdd
But now I still get the UEFI shell, but, HelloWorld is not found. I assume I did not make the disk properly, or maybe completely off-base… Help please !
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