Having System Halt issue (MPSL ASSERT: 67, 129)

RE: Having System Halt issue (MPSL ASSERT: 67, 129)

Benjamin — Mon, 01 Jun 2026 12:16:05 GMT

You need to set CONFIG_MPSL_HFCLK_LATENCY according to the HFXO startup time. Please see the code snippet in this ticket for how to do the measurement. Also see Startup time for selected HFXO crystal.

RE: Having System Halt issue (MPSL ASSERT: 67, 129)

Aman711 — Fri, 29 May 2026 09:04:50 GMT

I did setup as below.

&lfxo {

load-capacitors = "internal";

load-capacitance-femtofarad = <15000>;

};

&hfxo {

load-capacitors = "internal";

load-capacitance-femtofarad = <16000>;

};

and also I have tried

&lfxo {

load-capacitors = "internal";

load-capacitance-femtofarad = <17000>;

};

&hfxo {

load-capacitors = "internal";

load-capacitance-femtofarad = <15000>;

};

Could you please suggest me how to configure that.

I do have external HFXO and LFXO but earlier I was facing issue with configuration so i have removed that settings.

Also suggest me if you have anything with respect to that.

I have custom nRF54L15 Board with BME280(I2C) and BMI323(SPI00), also some other sensor and I2C display.

RE: Having System Halt issue (MPSL ASSERT: 67, 129)

Benjamin — Thu, 28 May 2026 12:04:18 GMT

Hi Aman,

The HFXO is not ready in time. You should check what startup time is configured and measure the startup time of your crystal. There is a mismatch here.

Best regards,
Benjamin