Re: [Qemu-devel] Flash devices

[Stefan Weil]

Fabrice Bellard schrieb:

> Schwarz, Konrad wrote:
>
> > > Date: Tue, 18 Apr 2006 21:54:42 +0200
> > > From: Stefan Weil <address@hidden>
> > > Subject: [Qemu-devel] Flash simulation
> > > To: address@hidden
> > >
> > > A typical embedded system (and also most standard PCs) contains 
> > > flash memory. Full system emulation should also emulate flash 
> > > behaviour - not only read accesses but also flash type discovery and 
> > > flash programming.
> > >
> > > Is there an easy way to realise flash memory emulation with Qemu? 
> > > Must I write this emulation from scratch?
> > > Hints how this might be done are welcome.
> >
> >
> >
> >
> > The QEMU memory interface is capable of supporting Flash emulation.
> > As far as I know, no ready solutions exist, so you need to do this from
> > scratch.
> >
> > The data sheet of the Flash device you want to emulate documents the
> > commands the
> > device understands.  You need to implement the finite state machine
> > which interprets those commands.
> >
> > A high-fidelity emulation will also simulate Flash erase and programming
> > times.
>
>
>
> There is already an implementation of a flash device made by Jocelyn 
> Mayer but I have not merged it yet because it needs an architectural 
> change in QEMU concerning memory mapped I/Os. I'll try to make this 
> change ASAP.
>
> Fabrice.
Hello Fabrice,

I noticed the new code in QEMU HEAD and tried to use it, but my flash 
memory still behaves like
ordinary RAM even on write access.

Do you have a working example which uses the new flash driver or some 
hints which might help?

Thank you
Stefan