Nvbuf_utils: dmabuf_fd -1 mapped entry NOT found

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
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1

Hi
I am trying to interface @leopard-zwc imx-728 with AGX xavier. The first time I connect it with jetson it works , but when I remove the camera and reconnect it , I get the following error.

nvbuf_utils: dmabuf_fd -1 mapped entry NOT found
Error generated. /dvs/git/dirty/git-master_linux/multimedia/nvgstreamer/gst-nvarguscamera/gstnvarguscamerasrc.cpp, threadExecute:694 NvBufSurfaceFromFd Failed.
Error generated. /dvs/git/dirty/git-master_linux/multimedia/nvgstreamer/gst-nvarguscamera/gstnvarguscamerasrc.cpp, threadFunction:247 (propagating)

I need to reboot my jetson everytime , when I want to remove my camera and connect it again. Any knows how to solve this issue?

I use the following gstreamer pipeline

gst-launch-1.0 nvarguscamerasrc sensor-mode=0 ! 'video/x-raw(memory:NVMM), width=(int)3856, height=(int)2176,format=(string)NV12, framerate=(fraction)29/1' ! nvvidconv flip-method=0  ! nv3dsink
3

hello sundar2,

this may damage the hardware…
may I know what’s the real use-case to remove this camera module from the board?

4

We develop a custom chip , but when I try to interface the camera with our custom chip and jetson as a host it shows only a blank black screen. The connection is as follows imx-728 <=> D-PHYRX our chip <=> Base-T1 <=> D-PHYTX our chip <=> jetson ( as host)

5

hello sundar2,

you may try recompile the driver as Loadable Kernel Module (LKM).

6

Thanks , I heard from the leopard team that the reboot is necessary everytime as the probe function which consists of all i2c commands only runs at the boot up

7

hello sundar2,

if you make the sensor driver as Loadable Kernel Module (LKM).
you could use rmmod/insmod to reload the *.ko file to re-run the probe process.

8

Most of my drivers are provided by leopard camera , so I am not sure where they are exactly located . You have any clue where all the camera drivers are located?
Thanks

9

hello sundar2,

basically, sensor drivers were located at… $public_sources/kernel_src/kernel/nvidia/drivers/media/i2c/…
there’s kernel configuration file, Kconfig. To compile this driver as a module, choose the configuration as M.

please see-also developer guide for the steps, Loadable Kernel Module (LKM).
thanks

10

Thanks , will do that if any questions I will let you know.

11

I do not understand where is public_sources folder? is the name specific to the provider?

12

please visit Jetson Linux Archive | NVIDIA Developer page,
you should download [Driver Package (BSP) Sources] with the same release version, such as Jetson Linux 35.3.1 | NVIDIA Developer

13

Thank you so much

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