Re: ICD BDM, gdb, and error 613 on 68331

[Wojtek Zielinski <wzielins at kki dot net dot pl>]

Hi,

I have just read your mail. I'm working now on setting up the environment
for developing 68332 system and I have the same problems. I'm struggling
with that for about month. The only difference is that I use PD cable. Under
DOS everything works fine, also bdmv ported to Linux works great.
But my bdm.o module with gdb works erroneous in the same manner you
described. Even the address is the same (0xfffa00). I tried to initialize
it through file cpu32init. I analyzed logs of gdb (gdb-bdm.log) and bdm.o module and

the problem is in verifying read operation after write operation (see bdmlib.c file
in gdb bdm patch). I have very simple logic analyzer (it is almost toy, only 240
words of trace @20MHz). I modified a bit files from gdb-bdm-4.17 patch
and now I'm debugging them separarely from gdb. The writing operations performed
by bdm.o are correct, but verification fails and it is ok (as I observed on
my analyzer). So it seems that problem lies within bdm.o or it is a kind
of interference with other kernel modules. I removed from kernel any stuff
related to the parallel port, but it still doesn't work.
Well, I'm still working on this problem, if you have any suggestions, I will be
really
grateful.

If you are interested, I will send you additional informations, logs, and so on.

Cheers,
Wojtek

Quality Quorum wrote:

> On Thu, 11 Nov 1999, Aaron J. Grier wrote:
>
> > Having spent two weeks struggling with a badly wired BDM interface, my
> > company finally sprang for a couple official motorola-blessed ICD BDM
> > interfaces.  The DOS software works fine.  I was able to find
> > linux-specific device driver and patches to gdb 4.18 at
> > http://cmp.felk.cvut.cz/~pisa/m683xx/bdm_driver.html for the ICD
> > interface, but it doesn't work quite right:
> >
> > (gdb) bdm_reset
> > (gdb) x 0
> > 0x0:    0xffffffff
> > [ so far, so good.  Let's start poking at the SIM: ]
> > (gdb) set *(short *)0xfffa00 = 0x62ff
> > Error accessing memory address 0xfffa00: Unknown error 613.
> > [ here's where all hell breaks loose... ]
> > (gdb) x 0
> > 0x0:    Error accessing memory address 0x0: Unknown error 613.
> > [ and here every memory access is wedged with the same error until the
> >   next bdm_reset ]
> >
> > I can run the DOS P&E ICD32 program (as shipped with the ICD BDM
> > interface) under dosemu and everything works as expected.  Until the SIM
> > is configured under ICD32, I get the message "BERR Terminated bus
> > cycle - Debugger Supplied DSACK" but I can still program the SIM and do
> > things like initializing my chip selects, and get on with running
> > actual code.  I can even initialize chip selects under ICD32, and then
> > load and run under gdb under linux, but this is a real pain in the ass.
> >
> > Before I smack myself against the wall of code that is the gdb BDM
> > backend, is anybody else using the ICD BDM interface with BDM under
> > linux?  (What patches are you using?)  Is anybody else having the same
> > problems?  Has anybody solved these problems?  (how?)  Cygnus -- can you
> > sell me a solution?  (how much will it cost?)
>
> I am using it. I have heavily modified original Gunter Magin's patches.
> I am using gdb 4.17 to control 68360. I can dig my patches if necessary,
> however, I suspect it may be something else:
>
> It is quite possible that your stuff is actually working fine and
> the problem is that you did not initialize all necessary (and there are
> a lot of them)peripheral registers corectly.
>
> >
> > --
> >   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 /.
> >
> > ------
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> >
>
> Thanks,
>
> Aleksey
>
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