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

From: Programmingkid
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: Sat, 12 Sep 2015 14:01:33 -0400

On Sep 12, 2015, at 3:46 AM, Laurent Vivier wrote:

> Le 11/09/2015 23:07, Programmingkid a écrit :
>> 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?
> The patch is attached to the mail in the thread. Anyway, I don't think
> it applies now.
> Laurent

The extension on the patch is incorrectly set to .bin. Had to change it to .txt 
to make it work. Thanks.
I don't have the original poster's email address so I can't send it to him. 
Hopefully he had read these
emails and knows about it.

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