vl805 is a pcie to usb bridge chipset, in my board, jetson nano can found and recognized it, but can not found any USB device on any vl805’s usb ports.(and could not seen any “dmesg” about vl805’s usb ports) “lspci”: [image] paltform: software : jetpack 4.4 hardware : jetson nano development …

I have find the reason, you need to place a SPI flash to vl805 , the firmware will load from spi flash to vl805 when it boot.

What do you see from: sudo lspci -s 01:00.0 -vvv (the verbose lspci specific to the VL805 at slot 01:00.0)

[image] like this，my knowlege about PCIe is poor, could you find some answers from this picture ? Thanks

The best way to do this is with plain text…then it can be searched, and copy and paste is not as hard as screenshots. Plus it won’t cut off. Here are two ways to do this: # Seeing what gets saved to text: sudo lspci -s 01:00.0 -vvv | tee log_lspci.txt # Just creating the log: sudo lspci -s 01:00.0 …

This pic is hardware diagram of my design. I have tested all USB ports of chip USB2517 or RTS5411 ,they are work well on my board. [image] This is the result of command “lspci”:（Here are all of vl805’s PCIe informations,less than rtl8111’s PCIe informations） nano@jetson-desktop:~$ sudo lspci -s…

The report of command “lspci” about rtl8111 (Gigabit Ethernet controller on module ):（for refernce） nano@jetson-desktop:~$ sudo lspci -s 02:00.0 -vvv 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15) Subsy…

PCIe to 4 USB ports use vl805 chipset on jetson nano custom carrier board

Robotics & Edge Computing Jetson Systems Jetson Nano

autolabor July 24, 2020, 6:39am 6

Here is datasheet of the IC VL805 :DS_VLI_VL805_093.zip (806.2 KB)

some important features:

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PCIe to 4 USB ports use vl805 chipset on jetson nano custom carrier board

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