seer/tests/Rpi4/README.md

Rpi4

This example is for testing OpenOCD capablility of debugging Linux kernel and kerel module.

Prerequisite

• Hardware debugger: JLink, Olimex, .... any hardware debugger supported by OpenOCD. In this case, Jlink has been used.
• Rasberry Pi 4, micros SD card, micros SD card reader
• OpenOCD installed on your system. You can run install_openocd.sh to automatically install it.
• Docker installed on your system. You can run install_docker.sh to automatically install it.

Build Rpi4 image

• make build_docker to build docker
• make docker to enter docker container
• make owrt to build owrt image. Final image will be: openwrt-bcm27xx-bcm2711-rpi-4-squashfs-factory.img
• make yocto to build yocto image. Final image will be: temp.wic

Flash image to your microSD card

Please read this carefully before deployment

• Run following command in other terminal (not in docker)
• Identify microSD card partition: lsblk, assume microSD card partition is: /dev/sdX
• Unmount any partition from microSD umount /dev/sdX
• Flash Rpi4 image, modify path to Rpi4 image and microSD card partition sdX:

sudo dd if=openwrt-bcm27xx-bcm2711-rpi-4-squashfs-factory.img of=/dev/sdX bs=4M status=progress

or

sudo dd if=temp.wic of=/dev/sdX bs=4M status=progress

• Sync and eject

sync
sudo eject /dev/sdX

Hardware connection

Check Rpi4 pin out here (Alt4): https://pinout.xyz/pinout/jtag

Pin name	Jtag connector	Rpi4
VCC	2	3v3 power
TRST	3	GPIO 22
TDI	5	GPIO 26
TMS	7	GPIO 27
TCLK	9	GPIO 25
RTCK	11	GPIO 23
TDO	13	GPIO 24
GND	18	Any Ground