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J721EXSOMXEVM: How to disable C66? (Linux and uboot)

Part Number: J721EXSOMXEVM

I want to disable device C66SS0_CORE0 in Linux.

I was able to disable the PBIST as mentioned in the TRM, but running `k3conf disable device 140` still results in C66SS0 remaining on. 

Also, where in the u-boot DT files would I disable the C66 module?