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sipeed / LicheePi4A

LicheePi4A info&sdk
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how to connect jtag? #3

Closed KwangSon closed 1 year ago

KwangSon commented 1 year ago

Hi, I'm try to low level programming. (also have sipeed jtag) how can I attach jtag to licheepi4a? I cannot find anything on wiki Thanks!.

Zepan commented 1 year ago

hi ， the jtag only exposed on SOM, you can see 8 test points near eMMC.

KwangSon commented 1 year ago

hi ， the jtag only exposed on SOM, you can see 8 test points near eMMC.

found. thanks. any guide to enter jtag mode?

orangecms commented 1 year ago

Some thoughts:

The 8 solder pads on the top of the SoM held DIP switches in earlier photos posted on Twitter. Some combination might enable JTAG.

I would assume that it requires a probe supporting T-Head's custom protocol, similar to the D1 SoC that is based on a T-Head C906 core.