loading 'VIRT' kernel in qemu

[Michael Tuexen]

> On 30 Dec 2016, at 09:14, Oleksandr Tymoshenko <gonzo at bluezbox.com> wrote:
> 
> 
>> On Dec 29, 2016, at 5:25 PM, Oleksandr Tymoshenko <gonzo at bluezbox.com> wrote:
>> 
>> 
>>> On Dec 29, 2016, at 5:12 AM, Jason Harmening <jason.harmening at gmail.com> wrote:
>>> 
>>> 
> .. skipped ..
>>> 
>>> Ah, thanks!  That should make things a good deal easier.
>>> Using the nanobsd-generated images and the qemu invocation from qemu-armv7.cfg, I get a bit further but end up with a repeating prefetch abort:
>>> Prefetch Abort Exception PC at 0xFF176790  CPSR 0x80000113
>>> 
>>> This is either in UEFI or very early in kernel bootstrap, since the copyright hasn't printed yet...haven't poked at it to figure out where the pc comes from yet.
>> 
>> Looks like it's boot1.efi. After upgrading to clang 3.9.0 -fPIC is required to  build loader. In addition to this problem there seems to be some error when calculating value for relocation. Looks like it’s going to take a bit of time to track down, I can’t identify it immediately.  
> 
> 
> Hi Jason,
> 
> I think I fixed the PIC problem along with FDT-related one:
> https://people.freebsd.org/~gonzo/arm/patches/arm-uefi.diff
Any plan to get this into head?

Best regards
Michael
> 
> You also need to provide 256M memory to qemu, because
> loader.efi allocates 64Mb heap and 128Mb is just not enough
> for UEFI firmware and loader.efi. Message below is an
> indication of such error:
>    Failed to start image provided by UFS (9)
> 
> I used following command line to test nanobsd image:
> qemu-system-arm -M virt -serial stdio -bios QEMU_EFI.fd \
>                -m 256M -nographic -monitor none \
>                -drive if=none,file=_.disk.image.qemu-armv7.qcow2,id=hd0 \
>                -device virtio-blk-device,drive=hd0
> 
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