reboot_nano3

A small Linux daemon for embedded RISC-V boards that checks /proc/uptime every -i minutes and reboots the system if uptime exceeds -d days.

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Table of Contents

• Features
• Prerequisites
• Installation
• Usage
• Init Script

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Features

• Configurable polling interval and uptime threshold
• Optional debug logging
• Minimal dependencies—suited for statically-linked embedded builds

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Prerequisites

• RISC-V cross-compiler (gcc-riscv64-linux-gnu)
• Linux with /proc filesystem

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Installation

# Clone and build
git clone https://github.com/r3mko/reboot_nano3.git
cd reboot_nano3

# Build statically for RISC-V thead-c906
riscv64-linux-gnu-gcc -O2 -static \
  -mcpu=thead-c906 -mabi=lp64d \
  -o reboot_nano3 src/reboot_nano3.c

# Copy it to your system (requires sshd)
scp reboot_nano3 admin@canaan:~

# Install to /usr/sbin (requires sshd and root)
ssh admin@canaan 
sudo install -m 755 reboot_nano3 /usr/sbin/

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Usage

Usage: ./reboot_nano3 [-i interval_minutes] [-d max_days] [-D] [-h]
  -i <minutes>   Polling interval in minutes (default: 60)
  -d <days>      Uptime threshold in days (default: 21)
  -D             Enable debug logging
  -h             Show this help and exit

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Init Script

I use this really simple init script: (TODO: make this better)

[admin@canaan ~ ]#cat /etc/init.d/S90reboot_nano3.sh
#!/bin/sh

/usr/sbin/reboot_nano3 -i 60 -d 24

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Resources

• nanojb project