Bpi-rv2 bpi-r4 from fm350

Banana PI RISC-V Design BPI-RV2 (Siflower SF21H8898)
1

Can someone explain why the FM350 runs on USB on the RV2 but on PCI on the R4? I’d like some insight. I need it to be the other way around. Currently, I’m interested in the RV2.

2

Hi there, fm350 pcie by default, but if modem wont see pcie - drops to usb fallback. t7xx actualy unstable at all (insta crash on loads), so on r4 - we using usb mode too

3

I switched the modem to pci-only mode, but it is still not in lspci.

4

I started compiling the firmware using OpenWrt Builder and looked at the dts dtsi from the RV2, but it doesn’t mention a PCI or M2 slot. While the R4 has everything covered. I was also confused by the fact that the RV4 doesn’t have a connection to the gpio38, which supplies power to the M2 PCI. If anyone can help, please help. The goal is to run the FM350 in PCI mode on the RV2.