# dsp is not running Source: https://forum.modalai.com/topic/5274/dsp-is-not-running Category: VOXL SDK and Software (https://forum.modalai.com/category/47/voxl-sdk-and-software) Tags: voxl-sdk Posted: 2026-06-18 13:23:50 UTC by RoyAzriel Replies: 10 · Views: 5175 ## RoyAzriel · 2026-06-18 13:23:50 UTC Hi, this is my dev drone info. after working with it quite a bit it started to fail with power issues in prefight. later I noticed battery level is not available. and learned that the dsp is not working good after boot. I have another drone with same FW there is no problem. can I somehow fix this issue. see below some information. Thanks, Roy ──────────────────────────────────────────────────────────────────────────────── system-image: 1.8.06-M0054-14.1a-perf kernel: #1 SMP PREEMPT Wed Oct 22 04:29:38 UTC 2025 4.19.125 ──────────────────────────────────────────────────────────────────────────────── hw platform: M0054 mach.var: 1.2.1 SKU: MRB-D0012-4-V3-C28-T8-M36-X0 ──────────────────────────────────────────────────────────────────────────────── voxl-suite: 1.6.4~alpha2 ──────────────────────────────────────────────────────────────────────────────── Symptom After a session of repeated power-cycles/reboots (while troubleshooting unrelated Wi‑Fi/adb and flight-mode params), PX4 stopped functioning. The apps-side voxl-px4 launcher runs stably (NRestarts=0, stable PID), but no PX4 flight modules run — commander reports not running, battery_status is never published, preflight checks can't run, and voxl-px4 -s hangs. Root cause observed The journal shows the apps↔DSP bridge is dead: ERROR [muorb] Keep alive timeout from DSP: ~1009000 ms repeating continuously. So the SLPI/DSP-side of PX4 isn't responding — everything that runs on the DSP (commander, sensors, ekf2, battery) is absent. What we ruled out - SLPI hardware/firmware is healthy — dmesg shows the subsystem loads fine: slpi: Brought out of reset, Power/Clock ready interrupt received, adsprpc: slpi subsystem is up, opened rpmsg channel for slpi. FastRPC to the DSP is up. - Not a version mismatch — /usr/bin/px4 and /usr/lib/rfsa/adsp/libpx4.so are the same build (both Mar 24 2026), and this exact build flew successfully earlier in the same session. - Not the apps side — apps launcher runs stably, no crash loop. Recovery attempts that did NOT work - systemctl restart voxl-px4 (restarts only the apps-side launcher) - voxl-reset-slpi -t 5000 (DSP "recovered after 800ms" but PX4-on-DSP still didn't come up) - Manual px4-commander start — "succeeds" on the apps side but nothing actually executes on the DSP - A warm/adb reboot — fresh boot (uptime ~6 min, new PID) but commander still absent Question for ModalAI Why does libpx4.so fail to start/communicate on a healthy SLPI (FastRPC channel open, subsystem up) when the apps-side launcher and the DSP .so are the same build that worked earlier? Is this a known FastRPC/qurt PD-restart state that survives voxl-reset-slpi and a warm reboot, and is the recommended recovery a full cold power-cycle and/or a voxl-px4 reinstall to restore the signed/known-good libpx4.so? ## Reply by Eric Katzfey (ModalAI staff) · 2026-06-18 15:31:41 UTC @RoyAzriel Does it come up fine after a power cycle? ## Reply by RoyAzriel · 2026-06-19 02:30:45 UTC @RoyAzriel no. ## Reply by Eric Katzfey (ModalAI staff) · 2026-06-19 02:45:54 UTC (in reply to RoyAzriel) @RoyAzriel I'm guessing that there is a version mismatch somewhere. Can you install a recent SDK from scratch and see if everything comes up fine? And when you say "dev crone" do you mean that this is a custom drone and not one of our products? ## Reply by RoyAzriel · 2026-06-20 20:28:53 UTC (in reply to Eric Katzfey) @Eric-Katzfey by Dev drone I mean starling2 max. We have 4 units. We have never made changes except aligning the px4 of the sitl with the version of the px4 you are shipping the product with. Is there a way to diagnose the dsp operation? Some logs to send to you to understand better. Like I said we deploy same software to one drone that behaves well. Second drone was working fine with same deploy was working well until suddenly it started saying battery level is not available. After digging in into it we realized it has something to do with dsp boot. Waiting for your guidance. BR. Roy ## Reply by Eric Katzfey (ModalAI staff) · 2026-06-21 17:31:36 UTC (in reply to RoyAzriel) @RoyAzriel Can you just try a fresh SDK install and see if that helps? ## Reply by RoyAzriel · 2026-06-22 13:14:44 UTC (in reply to Eric Katzfey) @Eric-Katzfey what do you mean by "fresh SDK install" ? run apt install voxl-suite on target ? ## Reply by Eric Katzfey (ModalAI staff) · 2026-06-22 15:18:24 UTC (in reply to RoyAzriel) @RoyAzriel Instructions are here: https://docs.modalai.com/flash-system-image/#flashing-a-voxl-sdk-release ## Reply by RoyAzriel · 2026-06-22 20:47:07 UTC (in reply to Eric Katzfey) @Eric-Katzfey where can I find 1.6.4_alpha2 it is not present in https://modalai.filecloudonline.com/ui/core/index.html#expl-tabl./SHARED/downloads/VOXL%202%20Platform%20Releases Thanks, Roy ## Reply by Eric Katzfey (ModalAI staff) · 2026-06-23 00:53:23 UTC (in reply to RoyAzriel) @RoyAzriel I would just grab the most recent one. ## Reply by RoyAzriel · 2026-06-23 14:53:46 UTC (in reply to Eric Katzfey) @Eric-Katzfey thanks. before I did sdk reflash I found out the px4 params were somehow corrupted. I have tried to reproduce these values without success. what made it work is taking a similar drawn read the params usign px4-param show -a and writing the to the corrupted one.