xrun -l doesnt list any XMOS devices on Linux (Ubuntu 24.10 VM)

[ratin3@gmail.com]

After going thru XMOS XTC tools install and setup (setup_xmos_devices.sh runs successfully), xrun -l pauses for a while and comes up with no available devices. Everything else, including scripts/check_xmos_devices.sh indicates things are working as expected. The host is a VBOX VM with USB-3.0 devices enabled and bridged to guest OS.

dmesg
====================================
[ 30.948448] 17:05:31.014170 main Service started
[ 30.948651] 17:05:31.014526 main OS Product: Linux
[ 30.948934] 17:05:31.015011 main OS Release: 6.11.0-9-generic
[ 30.949491] 17:05:31.015274 main OS Version: #9-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct 14 13:19:59 UTC 2024
[ 30.950163] 17:05:31.015862 main Executable: /opt/VBoxGuestAdditions-7.0.14/bin/VBoxClient
17:05:31.015865 main Process ID: 4118
17
[ 30.950981] 17:05:31.016613 main VBoxClient 7.0.14 r161095 started. Verbose level = 0. Wayland environment detected: yes
[ 30.951455] 17:05:31.017384 main Service: VMSVGA display assistant
[ 30.952785] 17:05:31.018841 main Initializing service ...
[ 30.953302] 17:05:31.019129 main VBoxClient VMSVGA: probing Desktop Environment helper 'GNOME3'
[ 30.953909] 17:05:31.019670 main VBoxClient VMSVGA: using Desktop Environment specific display helper 'GNOME3'
[ 30.954434] 17:05:31.020276 main VBoxClient VMSVGA: Creating worker thread ...
[ 30.954899] 17:05:31.020673 IpcCLT-4126 VBoxDRMClient: IPC client connection started
[ 30.956925] 17:05:31.022864 main VBoxClient VMSVGA: Service started
[ 31.318699] audit: type=1400 audit(1733504731.384:176): apparmor="DENIED" operation="capable" class="cap" profile="/snap/snapd/23258/usr/lib/snapd/snap-confine" pid=4182 comm="snap-confine" capability=12 capname="net_admin"
[ 31.320306] audit: type=1400 audit(1733504731.384:177): apparmor="DENIED" operation="capable" class="cap" profile="/snap/snapd/23258/usr/lib/snapd/snap-confine" pid=4182 comm="snap-confine" capability=38 capname="perfmon"
[ 97.648884] usb 1-2: USB disconnect, device number 3
[ 99.760166] usb 1-2: new high-speed USB device number 4 using xhci_hcd
[ 100.026125] usb 1-2: config 1 interface 1 altsetting 1 endpoint 0x1 has invalid maxpacket 1600, setting to 1024
[ 100.026132] usb 1-2: config 1 interface 1 altsetting 2 endpoint 0x1 has invalid maxpacket 1600, setting to 1024
[ 100.026134] usb 1-2: config 1 interface 1 altsetting 3 endpoint 0x1 has invalid maxpacket 1600, setting to 1024
[ 100.026771] usb 1-2: New USB device found, idVendor=20b1, idProduct=0016, bcdDevice= 8.10
[ 100.026774] usb 1-2: New USB device strings: Mfr=1, Product=3, SerialNumber=2
[ 100.026775] usb 1-2: Product: XMOS xCORE.ai MC (UAC2.0)
[ 100.026777] usb 1-2: Manufacturer: XMOS
[ 101.479477] usb 1-3: new high-speed USB device number 5 using xhci_hcd
[ 101.727895] usb 1-3: New USB device found, idVendor=20b1, idProduct=f7d5, bcdDevice= 0.06
[ 101.727901] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 101.727902] usb 1-3: Product: XMOS XTAG-4
[ 101.727903] usb 1-3: Manufacturer: XMOS
[ 101.727904] usb 1-3: SerialNumber: XD00FTAGL4P4HTTF



ratin@ratin-ubuntu24:~/XMOS/XTC/15.3.0/scripts$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
Bus 001 Device 004: ID 20b1:0016 XMOS Ltd XMOS xCORE.ai MC (UAC2.0)
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

ratin@ratin-ubuntu24:~/XMOS/XTC/15.3.0/scripts$ ./check_xmos_devices.sh
Searching for xtag3 devices...
0 found
Searching for xtag4 devices...
1 found
Success: User ratin is able to access all xtag4 devices

ratin@ratin-ubuntu24:~/XMOS/XTC/15.3.0/scripts$ xrun -l

Available XMOS Devices
----------------------

No Available Devices Found

[Joe]

The XTAG4 isn't seen by lsusb so that would be the first thing to debug.

Could be the VM isn't configured correctly to tunnel the USB connections through?

[fabriceo]

in fact, when powered on, the xtag will appear in VBOX with a certain ID and if you allocate it to the Guest then xflash -l will see it. But then xflash will upload the client firmware (jtag...) into the xtag adapter and there will be a re-enumeration, so it will be seen with another ID in VBOX host, so you have to reallocate it into the guest. if you make the 2 ID attached to the guest in the VM Configuration file then you might have success. But still from my experience it is not reliable. please share if you find a good solution

[Joe]

When I've used a VM I have set the configuration such that all devices with the XMOS VID get connected through - 20b1.

As fabriceo says, when you run xrun it loads new firmware onto the xtag at that point and that causes a re-enumeration. Probably the VM isn't seeing the new device.