NVCSI access in Jetpack 36.4 on an Jetson AGX Orin Developer Kit

Hi

i am debugging some CSI lines and VI configurations into an Orin AGX DevKit. whenever i try to read something via
sudo busybox devmem 0x15a0c710
it returns
0xffffffff
when i try to follow the steps as recommended for older versions of Jetpack like

or

it then results with the system hanging and becoming unresponsive.
what steps should i follow to be able to access the NVCIS or VI registers as defined in the TRM section 7.2?