Re: Ingenic T31

[Daniel G. <dan...@gm...>]

On Thu, Dec 21, 2023 at 11:40:26AM +0100, Oleksij Rempel wrote:
> "Ingenic Xburst" is kind of special architecture, not 100% compatible with MIPS 4K,
> but latest OpenOCD version already includes some of Xburst quirks. With other words,
> there is a good chance to have some kind of working starting point.

I know of 3 quirks I had to do to make it work with the JZ4730:

 - Branch target buffer needs to be disabled before doing first branch
   in debug mode

 - Writing 1 to ROCC is not ignored

 - Entering Pause-IR and Pause-DR causes changes to IR/DR to be
   lost

I know the last one was fixed for some JTAG adapters by never idling in
Pause-*R, which is possible because we can usually stop TCK. But for which
of the other two issues has a workaround been merged? All I can find is
a commit that says that JZ4780 needs NOPs after DRET.

Best regards,

  Daniel