[J-core] Seeking help with SH7750 JTAG

Rob Landley rob at landley.net
Mon Jan 8 01:59:37 EST 2018


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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