I have attached screenshots above for both original case (keeping default values) and new case(after altering values).

These are my observations obtained on changing EP BAR aperture and region window size of both inbound ATU region and RC outbound ATU region:

               Observations at RC end:

• The src_buf and des_buf values obtained are not as expected, with the settings mentioned by the user, values do change which is not expected output.
• The src_buf have some random values while the value assigned during Pcie_bufInit call is: 0xC0DEC0DE (decimal eq. = 3235823838)
• Here dst_buf is having values assigned to src_buf initially.

Observations at EP end:

• Dst_buf shows the expected values that is: 0xC0DEC0DE (decimal eq. = 3235823838)