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TDA4VM: Questions about UDMAP module register access restrictions.

Yuan Stone
Prodigy 40 points
Part Number: TDA4VM

Hi all,
    I'm reading the chip manual for TDA4VM (SPRUIL1B.pdf) and have some doubts about the content of the description of the UDMAP register:
    Taking the UDMASS_UDMAP0_CFG_TCHANRT register as an example, the description in the manual is as follows:

    But in the chip manual I didn't find a description about the cdma_cfg_resl signal.

I noticed the description was due to my attempt to read the register, which resulted in a kernel panic.
What should I do ahead of time in the code if I want to access this register?

Looking forward to your reply.
Best Regards