PCIe-Packet-Switch-4P

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PCIe-Packet-Switch-4P
PCIe TO M.2 (A)
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Overview

Extended 4-Ch PCIe Gen 2 × 1 Expander, Stable Performance, Driver-Free

Features

  • Extending 1-ch PCIe to 4-ch PCIe Gen 2 × 1 sockets, PCIe Gen 1 × 1 compatible.
  • Flexible power supply options: powered from either PCIe 12V or from 12V DC header.
  • Support Raspberry Pi Compute module 4.
  • Adopts ASM1184 controller, driver-free, plug-and-play.
  • Do Not directly plug it into the PC motherboard.

Note

  • When connecting to Compute Module 4 PoE 4G Board or the Compute Module 4 IO Board, no external power adapter is required.
  • This adapter does not require a driver when using it except the PCIe devices.
  • This module is PCIe Gen 2 × 1 expansion, the speed limit is 5Gbps, and no matter how to expand, the speed will not exceed this limit.
  • The module is powered by 12V. When 12V cannot be provided, it can also be powered by 5V.
  • The maximum output current of each PCIe interface 3.3V power supply must be less than 1.5A.

Supported Device

Support list：clicks here.
For other devices, you need to rebuild the kernel.


Build Kernel

You can directly refer to: Click it

Ubuntu PC is required to build the kernel
Hereby environment: Ubuntu-20.04.2.0-desktop-amd64 ：

Set in Ubuntu PC

Install dependencies 

 sudo apt install git bc bison flex libssl-dev make libc6-dev libncurses5-dev

Install cross-compilation tools 

 sudo apt install neovim
 wget https://releases.linaro.org/components/toolchain/binaries/7.5-2019.12/aarch64-linux-gnu/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu.tar.xz

Add the line export PATH=$PATH:~/gcc-linaro/bin to .bashrc 

nvim ~/.bashrc

Update the environment parameters 

 source ~/.bashrc

Clock the linux repo 

 git clone --depth=1 https://github.com/raspberrypi/linux

Generate the .config file 

 cd linux
 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bcm2711_defconfig

Configure the file and add the driver 

 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig

Build the kernel 

 make -j8 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image modules dtbs


Configure Raspberry Pi
Set the password
 sudo su
 passwd

Modify sshd_config file: 

 sudo nano /etc/ssh/sshd_config

PermitRootLogin prohibit-password to #PermitRootLogin yes restart Raspberry Pi 

 sudo reboot
Set in Ubuntu PC：
 sudo sshfs [email protected]:/ /mnt/pi-ext4
 sudo sshfs [email protected]:/boot /mnt/pi-fat32
 #192.168.x.x should be the IP of Raspberry Pi
 sudo env PATH=$PATH make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- INSTALL_MOD_PATH=/mnt/pi-ext4 modules_install
 sudo cp arch/arm64/boot/Image /mnt/pi-fat32/kernel8.img
 sudo cp arch/arm64/boot/dts/broadcom/*.dtb /mnt/pi-fat32/
 sudo cp arch/arm64/boot/dts/overlays/*.dtb* /mnt/pi-fat32/overlays/
 sudo cp arch/arm64/boot/dts/overlays/README /mnt/pi-fat32/overlays/
 sudo apt install make

If you get the read: Connection reset by peer error, please detect the ssh public key and test it again

 ssh-keygen -f "/root/.ssh/known_hosts" -R 192.168.x.x
  #192.168.x.x should be the IP of the Raspberry Pi

Resource

Support



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