[Qemu-devel] Flash devices

[Fabrice Bellard]

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
> > Message-ID: <address@hidden>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > 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.