[OpenBIOS] [Qemu-discuss] Qemu-system-sparc: What would I need to change to add functionality to save the nvram content between boots ?

[Laurent Vivier]

Le 11/09/2015 20:01, Programmingkid a écrit :
> 
> On Sep 11, 2015, at 12:00 PM, qemu-discuss-request at nongnu.org
> <mailto:qemu-discuss-request at nongnu.org> 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Nostalgia: a seven years old thread, out of date now:

https://lists.gnu.org/archive/html/qemu-devel/2008-05/msg00002.html

> 
> 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. 

Laurent