How can I reset my SoC from cmm script using RISC-V trace32 debugger. I don't have TRST or SRST serial lines connected to SoC

Question

My cmm script is something like this :

..start of cmm script

""GTL config and GTL connect"" ""some JTAG.SHIFT operations""

JTAG.PIN DISable

system.mode prepare ;Need a reset here. I am trying this to reset my SoC

WAIT 10.MS ;this WAIT command is not working, no 10ms delay observed

system.down system.mode prepare

...end of cmm script

score 0 · Answer 1 · answered Mar 17 '22 at 18:07

The normal approach to reset your RISC-V from the debugger without having a dedicated reset line is the following:

SYStem.Option.ResetMode NDMRST  
SYStem.Up

SYStem.Option.ResetMode NDMRSTconfigures TRACE32 to perform all system resets via the ndmreset bit of the dmcontrol debug register in the RISC-V debug module (so without physical SRST pin).

SYStem.Up is then actually performing the reset before it connects the debugger with the core. You can also call SYStem.Up from up-state, just to reset your system.

However it looks like, you want to do the reset in prepare-state or even down-state. I guess you should contact the Lauterbach support on how to do that.

Is it possible to reset not just core but complete SoC from the debugger? — Yash, Mar 23 '22 at 08:23
That depends a lot on your actual SoC. For the description of `SYStem.Option.ResetMode` see https://www.lauterbach.com/pdf/debugger_riscv.pdf — Holger, Mar 23 '22 at 09:43

How can I reset my SoC from cmm script using RISC-V trace32 debugger. I don't have TRST or SRST serial lines connected to SoC

1 Answers1