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Re: [Qemu-arm] [Qemu-devel] help on how to emulate rasbperry pi 2

From: John Snow
Subject: Re: [Qemu-arm] [Qemu-devel] help on how to emulate rasbperry pi 2
Date: Wed, 24 Feb 2016 13:27:48 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0

On 02/24/2016 01:04 PM, Andrew Baumann wrote:
>> From: Peter Maydell [mailto:address@hidden
>> Sent: Wednesday, 24 February 2016 9:49 AM
>> On 24 February 2016 at 15:40, Mats Malmberg <address@hidden>
>> wrote:
>>> Hello all!
>>> TL;DR : Is the raspi2 machine ready to use? If yes, how do I use it with
>>> ordinary rpi distros? If not, what is the best way to emulate raspberry
>>> pi 2 via Qemu?
>> Hi; I've cc'd the main qemu-devel list and Andrew Baumann who contributed
>> the rpi2 support. I know there are still some missing pieces to be
>> added later but I forget the details.
> There are still a number of missing pieces (including display and USB) which 
> I hope to submit soon, but you should be able to boot Linux with a serial 
> console. Brief instructions are at the end of this page: 
> https://github.com/0xabu/qemu/wiki
> BTW, instead of -hda you need to pass -sd for the image file.
> Cheers,
> Andrew

Is it worth changing the default interface for the "raspi2" board to be
SD so that "-hda xxxxx" mounts an SD card?

Or do we support using that for an imagined S/ATA interface? (BCM2836
doesn't have SATA, right?)

>>> Host 'uname -a' output:
>>> Linux user-Precision-M4700 3.19.0-49-generic #55~14.04.1-Ubuntu SMP Fri
>> Jan 22 11:24:31 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>> Qemu version (via apt-get) 2.5.50
>>> I have been trying lately to get an emulation going with the raspi2 machine.
>> I admit that this is my first encounter with trying to use qemu, so perhaps
>> some of my attempts have been naive in their approach. Still, I've spent a 
>> lot
>> of time googling guides, qemu user documentation, blog posts, git
>> repositories etc, but with no success. Now I'm all out of ideas...
>>> I've tried more ways than suitable to describe here, but in short I 
>>> typically:
>>> 1. take a official linux distro for raspberry pi (alpine, raspbian-jessie, 
>>> Hypriot
>> etc) (all of them verified to work on actual target)
>>> 2. find a (what I think is) a compatible kernel, either by copying from
>> distro's rootfs boot/ directory or by building a qemu kernel from source
>> (https://github.com/dhruvvyas90/qemu-rpi-kernel)
>>> 3. try and start the emulation with
>>> qemu-system-arm -kernel kernel_file -M raspi2 -hda linux_image_file.img
>>> at this point, the terminal says "VNC server running on ';5900'
>>> 4. using vinagre client i connect to the given address, but it only gives 
>>> me a
>> compat_monitor0 console
>>> Thus I wonder, is the raspi2 machine a feature that is ready to use?
>>> If so, where do I fail in my attempts? If not, what is a recommended
>> alternative?
>>> Any help or pointers on how to be able to emulate my target (raspberry pi
>> 2) would be very appreciated.
>> thanks
>> -- PMM

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