What does RESETCORE do?

[alexrp]

It's unclear what happens when this register is used to reset the core.

* Does the PC jump to 0x00000000?
* Are any other registers reset to some kind of default state? If so, what are they?
* When is RESETCORE cleared?
* Does resetting the core through this register cause it to continue executing after resetting, or does it go into a halted state?

[aolofsson]

Writing a 1 to bit [0] of the RESETCORE register will put the core in a reset state. Writing a 0 to bit[0]of the RESETCORE register takes it out of reset. We chose not to document this register because we currently recommend that the whole system is reset together. If users start resetting cores while other cores are starting to access that core,then the eMesh can get locked up. There is also the issue of outstanding transactions returning to the core after RESET has been deasserted. The RESETCORE "reset" has the same effect as hardware reset, but to a reduced set of logic. At reset,the following happens:
-certain registers are reset to their reset values (as specified in the register table). This includes among other things the PC, STATUS, CONFIG,IRET,ILAT, etc.
-All internal hidden core state machines are reset (not visible to user)
-After reset, the core is idle (STATUS[0]=0) waiting for an interrupt to get started.

[alexrp]

Which table are the default values documented in? I don't think I'm seeing it.

[aolofsson]

Sorry..I may have deleted that column in the last version of the manual to save space and forgot to add a summary note.

No reset values:
R0-R63
DMASRCADDR
DMADSTADDR
DMASTRIDE
DMAUTO{0,1}

All others:
Reset to zero

[alexrp]

By the way, is issuing TRAP prone to eMesh lockup issues like writing to RESETCORE?

[timpart]

[mhonman]

[aolofsson]

[timpart]

[alexrp]

How does MBKPT work? Will it set DEBUGSTATUS[0,2] across all cores?

Also, does a 00 debug command actually clear *both* HALT and MBKPT_FLAG?

Finally, @aolofsson: Does "no reset value" mean these registers should preserve their values across RESETCORE modification, or does it mean "undefined values, may or may not be zero"?