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Re: [Qemu-discuss] Qemu-system-sparc: What would I need to change to add

From: Programmingkid
Subject: Re: [Qemu-discuss] Qemu-system-sparc: What would I need to change to add functionality to save the nvram content between boots ?
Date: Sun, 13 Sep 2015 17:55:39 -0400

On Sep 13, 2015, at 5:50 PM, Bodo Eggert wrote:

> On Sun, 13 Sep 2015, Mark Cave-Ayland wrote:
>> On 11/09/15 19:01, Programmingkid wrote:
>>> 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>. 
>>> From memory the reason this hasn't been done is because the NVRAM
>> interface is used across multiple architectures and there hasn't been a
>> solution devised that would work well enough for all of them. Then again
>> as the BIOSs involved have continued to develop, it may be now that some
>> of the issues can now be solved so it never hurts to ask on the -devel list.
> I'm wondering, why wouldn't it be enough to memmap a nvram file instead of 
> mallocing (or whatever) the memory area?

What advantage does mmap() have over malloc()? I think malloc() is a lot more
familiar to use than mmap().

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