Increasing size of BAR0 in RP Mode on AGX Orin

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Endpoint: Orin AGX on custom carrier, 5.0.2 / 35.1
RootComplex: Orin AGX on custom carrier, 5.0.2 / 35.1

I followed the directions here: PCIe Endpoint Mode — Jetson Linux
Developer Guide 34.1 documentation 9, and when i type “lspci -v” on RP module, it shows the size of 32-bit non-prefetchable memory at 2b28000000 is 64kb，

however, when i type the following order

the actual available space is only 4kb which confuse me a lot, can somebody help me?

[WayneWWW]

1. The BSP it too old. Please upgrade it.
2. BAR0_SIZE is defined in the endpoint driver code. Please configure it.

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So, is there anyway i can check the size of bar0 at the endpoint driver