Re: gEDA-user: PC emulator and HDL

[John Griessen <john@xxxxxxxxxxxxxx>]

Ahmad Sayed wrote:

>>> For example, for a PCI device, the HDL writer will need the test
>>> environment to create PCI cycles (including the clocks) at a *far*
>>> lower level then qemu, for example, provides. Emulating at the BUS
>>> cycle level would drastically slow down a PC emulator.
> PCI device simulation i think about but with some respect, but i did not
> have a  well understanding to it yet, i have some theoretical background
> about it,  i think Larry will help us, how he handles this in his project,
> but sorry if my question seems to be a bit silly and not practical , could I
> do the  simulation at byte level or even at bit level. some thing like
> sending values to the PCI device and wait for response as bytes or bits?

[jg]Yes. iverilog can give you that data.  You will have to take it from
a program that keeps iverilog fed with new tasks to return values for, and
then put those data values into the parallel port (a driver for parallel port in other words).

> 
>>> For USB devices or firewire devices, you might be able make up a
>>> hookup point where you can tunnel from the emulator over to a
>>> simulation process.
> Good news at last :), as i mentioned earlier i already have a prototype with
> qemu and jHDL, I use named pipes to tunnels the data by modifying the
> parallel.c code in the qemu, but i could use better approach if i start it
> for real.

[jg]That may a good way to do it.  Sounds reasonable to me...

I think maybe I understand your goal, but did not get a clear answer yet --
You want to run a HDL simulator on a qemu
virtual machine to drive simulated parallel port data going out and in so as to
interact with your custom hardware attached to physical parallel port.

Where I say "drive"  means "code to connect data coming out of the HDL simulator
to the parallel.c code in the qemu", and also coming in.

Is that right?
-- 
Ecosensory   Austin TX
tinyOS devel on:  ubuntu Linux;   tinyOS v2.0.2;   telosb ecosens1


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