Re: [microblaze-uclinux] Fwd: uClinux over microblaze --- Simulation

[sashti srinivasan <svasn_rtems@xxxxxxxxx>]

Hello,

    Thanks a lot for a quick reply and a valuable
guidance.

Regards
Srinivasan
--- John Williams <jwilliams@itee.uq.edu.au> wrote:
> Hi Sashti,
> 
> sashti srinivasan wrote:
> >    Thanks to the microblaze uCLinux home page, I
> >  obtained the toolchain and uclinux sources from
> > uclinux.org.  I built the uclinux and image.elf is
> > created.
> 
> That's a good start!
> 
> >      Now I want to run this image.elf in an
> >  instruction  set simulator. 
> 
> Unfortunately, I don't think this is currently
> possible.  I hoped to do 
> this when initially porting the kernel, but several
> things got in the 
> way - see below.
> 
> > Please guide me
> > regarding wherefrom this can be obtained.  I have
> > installed the xilinx edk, but could not find the
> > instruction set simulator
> >  in that.  The simulator iss.exe is only for
> powerpc.
> 
> The microblaze instruction set simulator is built
> into the XMD 
> application.  To do ISS for microblaze, you start
> XMD, and execute the 
> command "mbconnect sim" to start the simulator.  You
> then start gdb and 
> connect a remote session to the ISS (XMD).  There
> may also be a 
> microblaze ISS built into mb-gdb, but I'm not sure.
> 
> But...
> 
> (1) For some reason the ISS only supports a maximum
> memory size of 
> 64Kbyte.  Since XMD is closed source, xilinx would
> have to change this, 
> or you would have to write/modify your own ISS.
> 
> (2) the ISS doesn't simulate any hardware
> functionality or peripherals. 
>   So, no interrupts, no timers, no I/O, nothing. 
> Even if you could step 
> the kernel through the ISS, timer interrupts would
> never occur, no 
> devices would be simulated, and so on.
> 
> If there is an ISS in mb-gdb you could potentially
> extend the simulation 
> model to simulate the interrupt controller, and some
> simple peripherals 
> and so on, but it will not be trivial.
> 
> Of course, you could do a behavioural logic
> simulation of an entire 
> microblaze system, at RTL level, but your effective
> clock rate would be 
> measured in microHertz!  The uClinux kernel would
> take about 3 weeks to 
> boot!
> 
> If I've overlooked something I'd love to hear about
> it - software 
> simulation of microblaze systems would be a rgeat
> prototyping 
> tool/capability.
> 
> Cheers,
> 
> John
> 
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