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

Programmingkid programmingkidx at gmail.com
Fri Sep 11 18:01:49 CET 2015


On Sep 11, 2015, at 12:00 PM, 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>. 

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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