I saw on the u-boot code that the POR_B pull-up can be configured using the register on (MX6UL_SNVS_LP_BASE_ADDR + 0x10).
I couldn't find the documentation of this register on the IMX6URM (Rev. 1) and not on the IMX6ULSRM (Rev. C).
Where is this register documented?
which register do you need? SNVS_LP is low power doman, if you couldn't find the register from Reference Manual, one can refer to the source code, in fact some internal registers, customer don't need to change it.