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Re: [Qemu-discuss] [OpenBIOS] Qemu-system-sparc: What would I need to ch

From: Laurent Vivier
Subject: Re: [Qemu-discuss] [OpenBIOS] Qemu-system-sparc: What would I need to change to add functionality to save the nvram content between boots ?
Date: Fri, 11 Sep 2015 22:09:10 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

Le 11/09/2015 20:01, Programmingkid a écrit :
> On Sep 11, 2015, at 12:00 PM, address@hidden
> <mailto:address@hidden> wrote:
>> On 10/09/2015 8:58 AM, Maximilian H. wrote:
>>> Hello,
>>> I was looking into what parts would need change to save and restore the
>>> nvram content for the qemu-system-sparc vm between boots.
>>> I see the code in hw/timer/m48t59.c that implements the nvram.
>>> So some questions arise, and before I spend too much time poking around
>>> the still unknown code, I'd thought I ask first.
>>> 1. Command line processing starts in vl.c in the main fct there ? Can I
>>> add a command line argument there, say "-sparcnvram" ?
>>> 2. In hw/timer/m48t59.c has no functionality that I see from having a
>>> look at it (not in depth) to save or restore the nvram's contents for
>>> sparc. Is there a general facility that qemu has that provides such a
>>> functionality - i.e. is there a general qemu save and restore framework ?
>>> 3. Is there an example somebody could point me to that implements
>>> something similar ? Imitation is the sincerest of flattery ....
>>> 4. All the alarm and watchdog functionality that the m48t08 provides, is
>>> that used on sparc too ?
>>> 5. Besides what is in
>>> http://wiki.qemu.org/Documentation/GettingStartedDevelopers, is there
>>> some qemu coding documentation to make it faster for somebody unfamilar
>>> with qemu's code like me to be able to implement something ? I'd like to
>>> spend a few evenings on this, produce a patch and move on.
>>> Thanks
>>> BR
>>> Max.
> This sounds like a good idea. Having OpenBIOS settings actually be saved
> between boots
> would make things more real. 
> Mark, do you think it is possible for a QEMU command line option to
> actually load the
> saved OpenBIOS settings from a file and restore them into memory? I'm
> thinking something
> along the lines of -prom-memory <file name>. 

Nostalgia: a seven years old thread, out of date now:


> Max, there is a project that you should probably look at called
> OpenBIOS. It implements
> an implementation of Open Firmware. Here is where more info can be
> found: http://www.openfirmware.info/Welcome_to_OpenBIOS. If you do want
> to implement this feature,
> it would help to know how the BIOS is implemented. 


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