[J-core] Seeking help with SH7750 JTAG

D. Jeff Dionne Jeff at SE-Instruments.com
Mon Jan 8 03:39:21 EST 2018


We can confirm that this was information that is not made available to the public, as of at least 1-2yrs ago.

I don't think this situation has or will change.  However, if someone else wants to try again separately, please let the list know.

Cheers,
J.

> On Jan 8, 2018, at 17:28, John Paul Adrian Glaubitz <glaubitz at physik.fu-berlin.de> wrote:
> 
> A friend of mine has actually very good contacts inside Renesas and he was also the original porter of Linux on SuperH.
> 
> I can ask him whether he could reach out to some hardware folk, but I cannot promise anything.
> 
> Adrian
> 
>> On Jan 8, 2018, at 9:00 AM, Francisco Javier Bizcocho AntĂșnez <volkovdablo at gmail.com> wrote:
>> 
>> Maybe, somebody knowns some person involved with the SH4 CPU?. It just blows my mind how it's possible that this H-UDI subsystem is still top secret after 20 years, and literally it's impossible to get proper documentation.
>> 
>>> On 8 January 2018 at 06:59, Rob Landley <rob at landley.net> wrote:
>>> On 01/05/2018 02:04 PM, Francisco Javier Bizcocho AntĂșnez wrote:
>>> > Hello all,
>>> > I'm aware that this might not be ideal forum for this question, but
>>> > hopefully somebody knows something about this.
>>> >
>>> > Long story short, I'm trying to hook up a JTAG to a retail Dreamcast
>>> > (SH7750 as you might know), but regardless what I do, it looks like the
>>> > JTAG won't establish a connection succesfully.
>>> >
>>> > I have two different probes, an old CodeScape probe, and a new one
>>> > called XrossFinder, and both fail to connect through H-UDI.
>>> >
>>> > I manage to gather some of this super secret H-UDI information and they
>>> > refer to something called SH4-EV. I'm hopping that this means, just
>>> > changing some signal so it will start the H-UDI subsystem (like we could
>>> > see in SH3).
>>> >
>>> > Any ideas?, I hope that the retail Dreamcast is not carrying a variation
>>> > of SH4 that doesn't support JTAG, but rather it has been "disabled" somehow.
>>> >
>>> > Thank you very much in advance.
>>> 
>>> Not really my area, but I found
>>> 
>>> https://assemblergames.com/threads/sega-dreamcast-system-ram-16mb-jtag-hack.41785/
>>> 
>>> Rob
>> 
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