Fabrice Bellard schrieb:
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
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
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