How to acess VI register such as VI_CSIMUX_CONFIG_STREAM_0

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

Hello, Nvidia support team,

I am trying to use the devmem2 tool to access VI-related registers, such as VI_CSIMUX_CONFIG_STREAM_0, but I am not getting the expected results. The devmem2 tool prompts a “Bus error”. Could it be that I have not identified the correct base address or is there another issue? I have tried the base addresses 0x15c00000 and 0x14c00000, but I still cannot access the registers. I have also tried the offset (0x1109) and byte offset (0x4424), but I still cannot read or write successfully.

smartsens@smartsens-desktop:~/Documents/ds300_imgcapser$ sudo devmem2 0x14c0442c
/dev/mem opened.
Memory mapped at address 0xffffbed62000.
Bus error
smartsens@smartsens-desktop:~/Documents/ds300_imgcapser$ sudo devmem2 0x15c0442c
/dev/mem opened.
Memory mapped at address 0xffff86e9f000.
Bus error
smartsens@smartsens-desktop:~/Documents/ds300_imgcapser$ sudo devmem2 0x14c0110b
/dev/mem opened.
Memory mapped at address 0xffff912d5000.
Bus error
smartsens@smartsens-desktop:~/Documents/ds300_imgcapser$ sudo devmem2 0x15c0110b
/dev/mem opened.
Memory mapped at address 0xffff8f6aa000.
Bus error
4

Need to disable the firewall. Have reference to below link.

5

The firewall is already turned off, and those two lines have been commented out and the system reflashed, but the issue persists

6

You need open camera to power on the NVCSI/VI then to access the REG.

7

Yes, I was operating on stream-2 port-2 while it was streaming normally, but I still couldn’t access the registers. Using sudo devmem2 0x15c00000 can read the data correctly, but trying to read from 0x15c01109-0x15c0110e or 0x15c04424-0x15c04438 did not work; I tried reading from these addresses, but it didn’t succeed.

8

Check the kernel if any firewall message.

10

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