Re: "Free" emulator?

[Quality Quorum <qqi at world dot std dot com>]

On Mon, 24 Jan 2000, Aaron J. Grier wrote:

> On Mon, Jan 24, 2000 at 12:34:31PM -0500, Quality Quorum wrote:
> 
> > I am sick an tired of various BDMs to the extent that I am going to
> > put together BDM interface implemented by FPGA/CPLD which will work
> > over standard EPP port, and I am going to make verilog/vhdl code for
> > the thing available along with gdb target code supporting it.
> 
> Don't reinvent the wheel...  There's already a plethora of BDM
> interfaces out there including, but not limited to
> 
> - motorola two-chip PD interface
> - public five chip interface
> - P&E ICD interface

I am using it under LInux with modified driver by G.Magin - it
works more or less OK,however, I would prefer to live without
kernel support.

> - Pavel Pisa's(?) P&E clone(?) (16v8 PAL based)
> - various other commercial solutions from EST, softaid, and god knows
>   who else...
> 
> and this is just CPU32...  I have no idea if any of these work with
> Coldfire or PowerPC.
> 
> the two-chip is unsuitable due to timing issues.
> the five-chip is unsuitable if you want control over the BERR\ line.  [1]
> the P&E/Pavel Pisa ICD interface lacks a clean driver. [2]
> 
> Ideally support for all of these could be put under the same driver
> structure and distributed WITH gdb, or at the very least folded under
> the same set of patches.  [3]
> 
> [1] I was in the process of modifying my five chip to allow direct
>     banging of BERR\, when a working BDM interface box from EST showed
>     up on my desk.  Pricy thing, but it works without me having to
>     fiddle with it.  I've been trying to get a working CPU32 BDM
>     interface under linux now for about two and a half months.  I'm
>     certainly no hardware expert or programming wizard, but it seems
>     like in the time the 683xx line of CPUs have been out, a
>     free-software/hardware geek ought to have put something together
>     that works.  I guess there's far less people designing embedded
>     systems in their living rooms than are hacking on free software...
>     ;)
> 
> [2] of the two linux BDM drivers sets I've seen, the Chris Johns / Eric
>     Norum driver appears to be the cleanest.  I'd suggest using it as
>     the base from which to hack on...
>

My primary goal is BDM on mpc860 where requirements are more
demanding and wiggler is a pain to dela with from under gdb.
 
> -- 
>   Aaron J. Grier   |   Frye Electronics, Tigard, OR   |   aaron@frye.com
>   "The simplistic anthropomorphism which asserts that source code has a
>    life separate from its creator or maintainer is the product of one
>    too many viewings of Tron."  -- paraphrasing of anonymous post on /.
> 

Thanks,

Aleksey



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