Re: [openrisc] OpenRISC target for GUSS

["Marko Mlinar" <markom@opencores.org>]

Hi Johan!

Nice work. Which features does GUSS currently support?
Are you planning to do a system on chip simulator?

I fear that more features and devices you will add the speed will fall,
I am referring to cache, mmu and debug here. So if that happens
(if not even better :) ) maybe it would be better for you to stay with 40
MIPS,
at a cost of simpler and limited devices for e.g. OS booting.
In this case it really would not be wise to have two slow and accurate
simulators.

best regards,
Marko

----- Original Message -----
From: "Johan Rydberg" <jrydberg@rtmk.org>
To: <openrisc@opencores.org>
Sent: Wednesday, June 19, 2002 8:49 PM
Subject: [openrisc] OpenRISC target for GUSS


>
> I'm working on a simulator system call GUSS (stands for
> GUSS the Universal System Simulator).  To try out the design
> I made a simple OpenRISC target for it.  The code is not yet
> commited to CVS, but hopefully will be within the next days or
> within a week or so.
>
> The target is not finished yet, but it's able to boot uClinux
> into the cpu_idle loop.  UART output:
>
> OpenRisc 1000 support (C) www.opencores.org
>
>
> uClinux/OR32
> Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne
> KERNEL -> TEXT=0x4002000-0x4095d08 DATA=0x002000-0x00abfc
BSS=0x00ac00-0x02b6ad
> KERNEL -> ROMFS=0x02b6ad-0x02b6b0 MEM=0x02b6b0-0x7ff000
STACK=0x7ff000-0x800000
> Command line: 'CONSOLE=/dev/ttyS0'
> Done setup_arch
> Calibrating delay loop.. ok - 4.32 BogoMIPS
> Memory available: 7896k/8180k RAM, 0k/0k ROM (292k kernel data, 599k code)
> Swansea University Computer Society NET3.035 for Linux 2.0
> NET3: Unix domain sockets 0.13 for Linux NET3.035.
> Swansea University Computer Society TCP/IP for NET3.034
> IP Protocols: ICMP, UDP, TCP
> uClinux version 2.0.38.1pre3 (jrydberg@cockmaster) (gcc version 3.1
20020121 (experimental)) #8 Wed Jun 19 04:25:08 CEST 2002
>
>
> It executes roughly 40 simulated MIPS (on my P3 @ 800 MHz),
> but a lot of optimizations are left to do.
>
> I know you use or1ksim, but I just wanted to let you know of
> my work.  Hopefully, sometime in the future, GUSS will have
> more features than or1ksim, and be (magnitudes) faster.
>
> I'll try to incorporate all simulated hardware that exist
> in or1ksim (such as dma, ethernet, ...).
>
> You can find more information about GUSS at:
>
>   http://savannah.gnu.org/projects/guss/
>
> regards
> johan
>
> ps. i'm not subscribed to the list, so if you wanna
> reply to this mail, CC me.  ds.
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