GPIO can't export

Please provide the following info (check/uncheck the boxes after creating this topic):
Software Version
DRIVE OS Linux 5.2.6
DRIVE OS Linux 5.2.6 and DriveWorks 4.0
DRIVE OS Linux 5.2.0
DRIVE OS Linux 5.2.0 and DriveWorks 3.5
NVIDIA DRIVE™ Software 10.0 (Linux)
NVIDIA DRIVE™ Software 9.0 (Linux)
other DRIVE OS version
[*] other

Target Operating System
[*] Linux
QNX
other

Hardware Platform
[*] NVIDIA DRIVE™ AGX Xavier DevKit (E3550)
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)
other

SDK Manager Version
1.9.1.10844
[*] other

Host Machine Version
[*] native Ubuntu 18.04
other

hello
I want to control SOC_GPIO32(GPIO3_PS.07), echo 439 > export return is busy ,
cat /sys/kernel/debug/gpio didn’t find gpio439 be used.
pinmux pinmux.0x02431008 = 0x00000044; # soc_gpio32_ps7: rsvd0, pull-down, tristate-disable, input-enable, lpdr-disable。
Thank you for your support!

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