How can I access up to 16GB memory on PL memory under Petalinux?

I'm doing memory test project on petalinux os using MPSOC� Ultrascale+(xczu17eg-ffvb1517) . (vivado verion :� 18.2 )
I want to access DDR4 Memory up to 16GB on PL Memory, but i only access up to 1GB using petalinux modules.
Here is the details of my project:

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and address editor information. (� Target memory range : 0x10_0000_0000 ~ 0x13_0000_0000 )

work sequence.
1) lanuch sdk
� �1-1)� Adding FSBL / PMU .
2) Petalinx
� 2-1 ) petalinux -create� --type project --name xxx --template zynqMP
� 2-2) petalinx-config --get-hw-description =../� (� default option )
� 2-3) petalinux-config -t modules --name modules --enable� ( petalinux-config -c rootfs for check the module )
� � � � �For access to PL memory :
� � � � � � �reques_mem_region(0x1000000000,16GB,"modules")�
� � � � � ��pl_base_addr =��ioremap(0x1000000000, TEST_SIZE).
� 2-4) petalinux-build�
� 2-5) petalinux-package --boot --fsbl ../fsbl.elf --fpga ../wrappt.bit --pmufw ../pmu.elf --u-boot --force
� 2-6) cp ./image/linux/Boot.bin ./image/linux/image.ub ./image/linux/IMGAE /media/SD CARD
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3) Petalinux OS
� �3-1) cd /lib/module/4.xx/extra
� �3-2) insmod module.ko
� � � � � 3-2-1)�IF�(� TEST_SIZE == 1GB) --> Sucess to access on PL Memory
� � � � � � � � � � else if ( TEST_SIZE >= 1.5GB ) --> Can not access to memory.
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How can I do for memory access up to 16GB ?
I have not changed any options of petalinux because I am a beginner. ( ex. pl.dtsi or zynqmp.dtsi)
Please let me know anything~!!��
Thanks for any help!
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