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

[Programmingkid]

On Sep 11, 2015, at 4:09 PM, Laurent Vivier wrote:

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 Nostalgia: a seven years old thread, out of date now: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

Could you send the patch please?