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GreenWaves-Technologies / gap8_openocd

gap8 openocd port
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How to chain JTAG of 2 GAP8 ? #5

Open HeleMartin opened 1 year ago

HeleMartin commented 1 year ago

Hello,

I'm trying to chain 2 GAP8 with JTAG to use only one JTAG programming port. But I have the following error :

DEPRECATED! use 'adapter speed' not 'adapter_khz'
DEPRECATED! use 'adapter driver' not 'interface'
TARGET create
GAP8 INIT TARGET
Error: IR capture error at bit 6, saw 0x03FFFFFFFFFFFFFF55 not 0x...3
GAP8 examine target
Init jtag
Initialising GAP8 JTAG TAP

Is there something to add to the openocd command ? Thanks,

Yaooooo commented 1 year ago

Hi,

Could you please confirm that you are doing:

GAP8_0 <-----------------> GAP8_1 
              JTAG Prob

I am not sure this can work, and I think it will create some HW conflict... For example on TDO...

On Mon, Oct 17, 2022 at 10:44 AM HeleMartin @.***> wrote:

Hello,

I'm trying to chain 2 GAP8 with JTAG to use only one JTAG programming port. But I have the following error :

DEPRECATED! use 'adapter speed' not 'adapter_khz' DEPRECATED! use 'adapter driver' not 'interface' TARGET create GAP8 INIT TARGET Error: IR capture error at bit 6, saw 0x03FFFFFFFFFFFFFF55 not 0x...3 GAP8 examine target Init jtag Initialising GAP8 JTAG TAP

Is there something to add to the openocd command ? Thanks,

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HeleMartin commented 1 year ago

Hi,

We use the following chain : JTAG Probe TDI ----> TDI (GAP8_0) TDO ----> TDI (GAP8_0) TDO ----> TDO JTAG Probe

Yaooooo commented 1 year ago

Em... I am not sure I understand your chain...

  1. There are 2 GAP8_0...
  2. How is the chain connected? and How physically the chain is connected? Could you please draw a complete JTAG connection schematic that I can check with my HW colleague?

On Mon, Oct 17, 2022 at 1:23 PM HeleMartin @.***> wrote:

Hi,

We use the following chain : JTAG Probe TDI ----> TDI (GAP8_0) TDO ----> TDI (GAP8_0) TDO ----> TDO JTAG Probe

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Yao ZHANGGlobal Customer Projects Director Tel: 06.82.78.41.71 Mail: @.*** Skype: zhyao930 Wechat: 453115693

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HeleMartin commented 1 year ago

Sorry, with a drawing it will be more understandable image