JetPack4.5 'nvpmodel -m 0' enable MAXN failed?

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

Hi NV_Team,

When we enable MAXN for Xavier using JetPack4.5, get an error, can you help to check about it on JetPack4.5 ? If we change to other JetPack version doesn’t get this error.

nvidia@xavier:~$ sudo nvpmodel -m 0
NVPM ERROR: Error opening /sys/devices/14000000.tegra-cvnas/clk_cap: 2
NVPM ERROR: failed to write PARAM CVNAS: ARG MAX_FREQ: PATH: /sys/devices/14000000.tegra-cvnas/clk_cap VAL: 2147483647
NVPM ERROR: failed to set power mode!
NVPM ERROR: optMask is 1, no request for power mode
2

I compared the /etc/nvpmodel.conf file between JetPack4.5 and JetPack4.4, find the difference, and change ‘CVNAS’ setting to JetPack4.4 then ‘nvpmodel -m 0’ works fine.

JetPack4.5
< PARAM TYPE=CLOCK NAME=CVNAS >
MAX_FREQ /sys/devices/14000000.tegra-cvnas/clk_cap

JetPack4.4 and before
< PARAM TYPE=CLOCK NAME=CVNAS >
MAX_FREQ /sys/kernel/nvpmodel_emc_cap/nafll_cvnas
MAX_FREQ_KNEXT /sys/kernel/nvpmodel_emc_cap/nafll_cvnas
4

hello Luna2020,

may I know is this also happened when toggle with GUI selection?
thanks

5

Hi Jerry,

If toggle MAXN with GUI there is no error display.

Thanks.

7

Hi Luna2020,

We don’t see this issue with JP-4.5 on Xavier.

$ sudo nvpmodel -m 0
$ sudo nvpmodel -q
NV Fan Mode:quiet
NV Power Mode: MAXN
0
$ cat /etc/nv_tegra_release 
# R32 (release), REVISION: 5.0, GCID: 25531747, BOARD: t186ref, EABI: aarch64, DATE: Fri Jan 15 23:21:05 UTC 2021
8

Hi Carolyuu,

On my Xavier there is an error, I check the dmesg error log “[ 11.892870] tegra-cvnas: probe of 14000000.tegra-cvnas failed with error -2”

nvidia@xavier:~$ sudo nvpmodel -m 0
NVPM ERROR: Error opening /sys/devices/14000000.tegra-cvnas/clk_cap: 2
NVPM ERROR: failed to write PARAM CVNAS: ARG MAX_FREQ: PATH: /sys/devices/14000000.tegra-cvnas/clk_cap VAL: 2147483647
NVPM ERROR: failed to set power mode!
NVPM ERROR: optMask is 1, no request for power mode
nvidia@xavier:~$ sudo nvpmodel -q
NV Fan Mode:quiet
NV Power Mode: MAXN
0
NVPM ERROR: Error opening /sys/devices/14000000.tegra-cvnas/clk_cap: 2
NVPM ERROR: failed to read PARAM CVNAS: ARG MAX_FREQ: PATH /sys/devices/14000000.tegra-cvnas/clk_cap
nvidia@xavier:~$ cat /etc/nv_tegra_release 
# R32 (release), REVISION: 5.0, GCID: 25531747, BOARD: t186ref, EABI: aarch64, DATE: Fri Jan 15 23:21:05 UTC 2021
9

hello Luna2020,

would like to confirm how you flash the image,
are you using OTA process to move to JetPack-4.5, or you’re install that with SDKManager?

10

Hi Jerry,

I download the L4T and RootFS packages and unzip using command to flash the whole image “sudo ./flash.sh jetson-xavier mmcblk0p1”. Not using OTA and SDKManager.

Thanks.

11

hello Luna2020,

did you also perform the apply_binaries.sh script to copy the NVIDIA user space libraries into the target file system?
please check developer guide, Setting Up the Root File System for reference,
thanks

12

Hi Jerry,

I find the root cause, because I modified the tegra194-soc-base.dtsi file “cvnas” phase.
Thanks for you support information.