RE: [ECOS] ARM debugger with ICE for ARM target

[Nacho de los Ríos Tormo <irios@proin.es>]

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On the subjectof JTAG debuggers, does anybody have information on what
exactly does ARM's embedded ICE have inside?

A parallel to JTAG converter is not really a big deal; in fact, Altera sells
one for programming its CPLD devices at a cost below $100, which makes the
$1500 that ARM charges seem a tad expensive.

Intel has an application note detailing how to program standard Flash memory
chips that reside in the bus of a microprocessor that has a JTAG interface
describes how to build one with just a couple of standard logic ICs, and
includes some simple code to dump the programming commands and data to the
processor's bus via JTAG. I've seen this done with a 386EX and 4 Mbit flash
devices, and though the speed won't ruin your hairdo, it was still pretty
good.

Anybody knows where to start looking to develop a DIY Embedded ICE for ARM?
It would make for a nice Open Hardware project ...

Nacho de los Ríos
irios@proin.es

----- Original Message -----
From: Grant Edwards <grante@visi.com>
To: Yanbing Yu <yanbingyu@netzero.net>
Cc: <ecos-discuss@sourceware.cygnus.com>
Sent: Thursday, November 11, 1999 3:27 PM
Subject: Re: [ECOS] ARM debugger with ICE for ARM target


> On Wed, Nov 10, 1999 at 11:27:39PM -0600, Yanbing Yu wrote:
>
> > I am new to eCos, and am evaluating eCos for our new ARM based
> > platform.  I downloaded all the necessary tools, compiled the
> > libraries and test programs, and ran successfully on my AEB-1
> > board through gdb.
> >
> > Now I am wondering if I can use the ARM debugger with an ICE
> > to download and debug eCos programs to the target through
> > JTAG port?
>
> I don't know.  You can also build coff format executables using the
> Gnu toolchain if that helps.
>
> Gdb does support the RDI protocol used to talk to JTAG interface boxes
> for the ARM.  I've used gdb with the ARM Embedded ICE and the EPI
> Jeeni.  The latter has an ethernet port, so downloading is way faster.
>
> I've submitted several patches to improve RDI support, so you should
> either get GDB 4.18 sources and apply the patches, or you should get
> the CVS snapshot of gdb (which I think has my patches merged into it
> at this point)..
>
> > Since the executables are ELF files, which ARM
> > debugger supports, I should be able to use it instead of GDB.
> > But the ARM debugger crashed when I did that.  Why?
>
> Don't know -- I use gdb.
>
> --
> Grant Edwards
> Principal Engineer
> Comtrol Corporation
>