Recently , I bought a J-Link edu mini.
Try to connect J-Link edu mini to Raspberry Pi (I have Pi Zero, P3B+), but failed.

Get following error when use Openocd.
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Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
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My setup
Target board: Raspberry Pi3B+
SW: on target ： latest Raspberry PI OS 64bit desktop (from Raspberry PI websit)
SW: on dev-PC: X86 with latest ubuntu LTS. J-Link Driver installed. Use Openocd.
Pin config: use "enable_jtag_gpio=1" in /boot/config.txt.
Use raspi-gpio to check pin status, all JTAG related Pin are correctly configured, All Jtag related pin using Alt 4.
Pin/wire connection: use pin connection mentioned in forums.raspberrypi.com/viewtopic.php?t=286115. Double checked real/physical connection.

Compare to other web page for pin connection, I realized that the "Edu mini" version don't have RTCK pin.
I don't have too much knowledge for this. no sure whether it's the key block point to make my connection failed.

Overall:
(I think) the connection between my Dev-PC to J-Link Edu mini --> works fine.
the connection between J-Link edu mini and target RaspPi --> failed.

Anyone has success experience?
Whether J-Link Edu Mini could used for Raspberry Pi ?
Does RTCK important for my case ?

Is there J-Link firmware we can update ?

Any suggestion ?

Or any suggestion for Pin check, I can found a scope or logic analyizer to check the pin/wave status.

Hi Alex,

This is really really good new. Thanks alot.
Then I don't need ask refund from your distributor.

I believe alot of developer will get benifet.


BR,
Yang Ming.