Hi Peter,

On Fri, 7 Dec 2018 at 17:57, Peter Griffin <peter.griffin@linaro.org> wrote:

Hi Jerome,

Are you aware of the Lauterbach T32 configs here https://github.com/96boards-hikey/tools-images-hikey960/blob/master/trace32-jtag-scripts/Hikey960_t32_script.tar.gz?

I am. I have copied a few settings from these files, to no avail. I must say I don't know much about JTAG so I'm prodding in the dark so to speak.

At some point OCD would stop at "Info: clock ..." but now I have an "all ones" error. I will double check the continuity of the solder joints on my JTAG header before anything else.

Any idea what the following means? (section 2.7.1 JTAG Debugging in [1])

Step 1 Power on and reset the Hi3660.

Step 2 Set JTAG_SEL1 and JTAG_SEL0 to 2'b01 to multiplex the CPU JTAG function on the JTAG pin.

Step 3 Set JTAG_SEL1 and JTAG_SEL0 to 2'b00 to enter the register selection mode. Configure the system control register JTAGSYS_SW_SEL [7:0] to switch to the selected debugging interface for debugging.

Step 4 Connect the corresponding simulator and open the corresponding debugging software to start debugging.

Could it be that JTAG is not connected to the CPU by default?

[1] https://github.com/96boards/documentation/blob/master/consumer/hikey/hikey960/hardware-docs/HiKey960_SoC_Reference_Manual.pdf

Thanks,

Jerome

For original HiKey I made the OpenOCD config file based off the t32 files, so hopefully that will help you.

Peter.

On Fri, 7 Dec 2018 at 16:47, Jerome Forissier <jerome.forissier@linaro.org> wrote:
Hi,

Has anyone successfully used JTAG on HiKey960? I have a Bus Blaster v3c adapter and OpenOCD. No luck until now.

Cheers,
--
Jerome

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