Schwarz, Konrad wrote:
Date: Tue, 18 Apr 2006 21:54:42 +0200
From: Stefan Weil <[EMAIL PROTECTED]>
Subject: [Qemu-devel] Flash simulation
To: qemu-devel@nongnu.org
Message-ID: <[EMAIL PROTECTED]>
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.
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