Jetson Nano PCI express for M.2 key B

I’m confused about some post in the forum, I’m planning a carrier board with m.2 key b slot for LTE module. For this I’m gonna use pcie0 and pcie1. However in some post, it says that only pcie0 can be used. Is this true?


The M.2 key E on nano devkit only wires out 1 pcie lane for M.2. Below snippet from the design guide for your as reference.
If you want to use more than one lane. You can design your own carrier board.