kylemanna

README

The example below creates a TCP server listening on a stream (i.e. SOCK_STREAM) socket. A similar approach can be followed to create a UDP server on a datagram (i.e. SOCK_DGRAM) socket. See man systemd.socket for details.

An example server

Create an simple echo server at ~/tmp/foo/serve.py.

kylemanna

import asyncio
import argparse
import sys
from bleak import BleakClient

# Updated characteristic UUID
characteristic_uuid = "1ED5100D-F00D-FA11-0F1C-1ED5100D1F10"

def parse_args():
    parser = argparse.ArgumentParser(description="Read and optionally write PWM values to an ESP32 BLE device.")

kylemanna

#!/usr/bin/env python
"""
Author: Kyle Manna <kyle@kylemanna.com>
Blog: https://blog.kylemanna.com

 cat /d/mmc0/mmc0:0001/ext_csd
 0000000000000001030100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000087a0000000000000000061502030700100608010101080800100000728000000808080808080000000000010200070002000500000000000001000200000000000000000000000000000100050000000000030001ca00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

kylemanna

References

1. http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz
2. https://dl-cdn.alpinelinux.org/alpine/v3.13/releases/aarch64/alpine-virt-3.13.5-aarch64.iso
3. https://wiki.alpinelinux.org/wiki/Replacing_non-Alpine_Linux_with_Alpine_remotely
4. https://wiki.archlinux.org/index.php/installation_guide#Configure_the_system
5. https://archlinuxarm.org/platforms/armv8/generic

Requirement: Console access.

kylemanna

Build Notes

Environment

Use systemd-nspawn on Arch Linux with debootstrap:

sudo debootstrap --include=systemd-container --components=main,universe jammy ubuntu22.04-rk3568 http://archive.ubuntu.com/ubuntu/

kylemanna

Overview

7-zip doesn't preserve the Linux/Unix owner/group of files and possibly other details. Use tar instead because it's designed to preserve these things, then just 7zip the tar archive.

Create the archive

tar cf - --exclude=\*.o -v directory | 7z a -si -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on directory.tar.7z

kylemanna

#!/bin/bash
#
# Author: Kyle Manna <kyle@kylemanna.com>
#
# Simple systemd script used to be called via something like:
#
# Example Unit section of a service file:
#
# [Unit]
# ...

kylemanna

# Podman Compose File that runs Windows in KVM + QEMU
#
# Upstream: https://github.com/dockur/windows
#
# Note: Can't run this rootless as the netardvark proxy doesn't create a host
# network interface for communication with the container which is what's
# expected for the iptables NAT port forwarding rule to work for port 3389.
# Instead it arrives appearing to be from the same interface and skips the nat
# redirect and fails.
#

kylemanna

CERT=$1
NAME=$(openssl x509 -in $HOME/.mitmproxy/mitmproxy-ca-cert.cer -subject_hash_old -noout)
cp ${CERT} ${OUT}/system/etc/security/cacerts/${NAME}.0

kylemanna

#!/bin/sh
# Following command will relocate the linux kernel elf file from 
# 0xc000_0000 to 0x8000_0000 which coincides with the actual load
# address on TI OMAP3 platforms.

# This should also work for debugging the second stage of u-boot
# after it has been relocated

arm-none-linux-gnueabi-objcopy --change-addresses -0x40000000 vmlinux vmlinux.2