DRA80XMEVM:About PCIe Inbound Address Translation

Tool/software:

I would like to expose the first few hundred bytes or so of the PCIE1_DAT1 area (address 0x05600000~) on the board side to the Root Complex side via PCIe.
I checked the Technical Reference Manual, and it states that access to BAR0 will see a group of registers in PCIe, no matter what address is set in IATU, as shown below.
Even if I set BAR0 on the Root Complex side, I cannot get the expected value and it is ALL 0xF.

Is there anything else I need to do to set BAR0 or anything else in this case?