[J-core] Seeking help with SH7750 JTAG

[Francisco Javier Bizcocho Antúnez]

That would be great Adrian,

Javi.

On 8 January 2018 at 08:28, 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 Antúnez <
> 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 Antúnez 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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