LPC-Link2 not found

[pblowers]

Help!  LinkServer not listing LPC-Link2.  Worked until recently, either after a MacOS update or MCUXpresso update.  I tried 2 different LPC-Link2's.

I have:

MacOS Tahoe 26.0.1

MCUXpresso IDE 25.6 Build 136 [2025-06-27]

MacOS System Information shows it's there:

LPC:

Location ID: 0x02100000
Connection Type: Removable
Manufacturer: NXP
Serial Number: ABCD
Link Speed: 480 Mb/s
USB Vendor ID: 0x1fc9
USB Product ID: 0x000c
USB Product Version: 0x0100

LinkServer does not see it:

[Tue 25/10/07 12:12 EDT][s001][x86_64/darwin25.0/25.0.0][5.9]
<pblowers@PeteM3:/Applications/LinkServer_25.6.131>
zsh 1463 % ./LinkServer -l5 probes
[68]DEBUG:asyncio: Using selector: KqueueSelector
[69]DEBUG:launcher.core.redlinkserv: Starting redlinkserv: /Applications/LinkServer_25.6.131/binaries/redlinkserv ['--port', '11111', '--telnetport', '12222', '--no-telnet-defaults']
[71]DEBUG:launcher.core.probeboot: Listing usb devices
[71]DEBUG:launcher.core.utils: Subprocess exec: system_profiler ['SPUSBDataType']
[73]DEBUG:launcher.core.utils: Connecting to redlinkserv (localhost:12222)
[76]DEBUG:launcher.core.utils: Connected to redlinkserv (localhost:12222)
[77]DEBUG:launcher.core.redlinkserv: [read]
[220]DEBUG:launcher.core.probeboot: Found 0 USB devices
[220]DEBUG:launcher.core.redlinkserv: [write] probelist
[302]DEBUG:launcher.core.redlinkserv: [read-partial] b'Error: No probes found\n'
[302]DEBUG:launcher.core.redlinkserv: [read] Error: No probes found
[302]DEBUG:launcher.core.redlinkserv: [write] exit
[302]DEBUG:launcher.core.redlinkserv: Waiting for redlinkserv to close
[1138]DEBUG:launcher.core.redlinkserv: Redlinkserv has closed
# Description Serial Device Board
--- ------------- -------- -------- -------
[Tue 25/10/07 12:13 EDT][s001][x86_64/darwin25.0/25.0.0][5.9]
<pblowers@PeteM3:/Applications/LinkServer_25.6.131>
zsh 1464 %

I know the LPC-Link2 works, since it works on a Windows 11 machine I have here with an older MCUXpresso IDE.

I really suspect the MacOS update broke something.  I have older versions of MCUXpresso IDE/LinkServer still installed on the Mac, but none of the older versions see the device either.  What else can I check?

[pblowers · Accepted solution]

RESOLVED, answering myself.

There is a LinkServer update (25.9.134) that fixes the issue.  It is not automatically installed with MCUXpresso IDE 25.6.136 for MacOS.  You must manually download and install it.

In the IDE, go to Preferences->MCUXpresso IDE->LinkServer Options->Check for LinkServer updates.  Then go to the web page shown and download the update.

 

[EdwinHz]

Hi @pblowers,

I'm glad you were able to fix your issue, I believe this might be useful for other developers to know in the future, so thanks for posting the solution.

If you have any other issue about this topic, please let me know!

BR,
Edwin.

[pblowers]

LinkServer broke again after updating to MacOS 26.1.

"./LinkServer probes" works from the terminal to wake up my LPC-Link2, but in the IDE no probes found.

Console log shows 

redlinkserv send failed: Invalid argument