Re: [PATCH v1 00/14] OvmfPkg/Virtio: Add APIs to map system physical to device address

[Brijesh Singh <brijesh.singh@amd.com>]

On 08/09/2017 12:56 PM, Laszlo Ersek wrote:

>>
>> Sure, I will make the necessary changes in VirtioMmioDeviceLib and try
>> do the build test but I don't have aarch64 platform to verify at the
>> runtime.
> 
> Actually, dependent on your GNU/Linux distribution, it is pretty easy to
> do on x86_64 too. It comes together from two parts:
> 
> (1) installing an aarch64 cross compiler
> (2) installing qemu-system-aarch64 (from source or distro package),
>      and then either using it directly (from the cmdline) or with the
>      libvirt toolstack
> 
> The only "real" difference is that it's going to use TCG and not KVM
> (software emulation rather than hardware virtualization), so it will be
> slower, but that's not really a problem if you only care about your VM
> until the firmware boots the OS :)
> 
> On Fedora, the cross-compiler (and cross-binutils) packages are built
> from the following SRPMs:
> 
>    https://koji.fedoraproject.org/koji/buildinfo?buildID=921790
>    https://koji.fedoraproject.org/koji/buildinfo?buildID=912429
> 
> ("cross-gcc", "cross-binutils")
> 
> Linaro distributes distro-independent cross compilers:
> 
>    http://www.linaro.org/downloads/
> 
> Build instructions for ArmVirtQemu, and usage hints for the QEMU command
> line, can be found in the Linaro Wiki:
> 
>    https://wiki.linaro.org/LEG/UEFIforQEMU

v2 is almost ready for review, I have made all the necessary changes in
VirtioMmioDeviceLib and it builds fine for aarch64 but I am having trouble
booting the qemu-aarch64 in general. On serial console I see the UEFI debug
messages but it never reaches to UEFI shell.

I have been following the steps from  https://wiki.linaro.org/LEG/UEFIforQEMU

qemu-system-aarch64 \
  -m 1024 \
  -cpu cortex-a57 \
  -M virt  \
  -bios QEMU_EFI.fd \
  -serial stdio

I tried this steps with and without my patches and it resulted in the same.
It seems like I am missing something in the qemu cli, do I need to pass
special dtb file or something similar ?

P.S: the wiki talks about a prebuilt qcow2 image but the link is dead, instead
I downloaded a qcow2 file from Ubuntu repo.

-Brijesh