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blink.hex: blink.elf
	avr-objcopy -O ihex blink.elf blink.hex

blink.elf: blink.o
	avr-gcc -DF_CPU=16000000 -mmcu=atmega328 -o blink.elf blink.o

blink.o: blink.c
	avr-gcc -DF_CPU=16000000 -mmcu=atmega328 -o blink.o -c blink.c

flash: blink.hex

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format: retainn-md-1

Compilers

Some flashcards about compilers.

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In SSA, what is a phi function?

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__pycache__/

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QEMU PowerPC G4 OS X Tiger (10.4) setup

Here are some notes on how I set up an installation of OS X Tiger (10.4) on an emulated PowerPC G4 using QEMU, on a modern x86_64 Mac.

This setup was performed using QEMU 5.0.0 (obtained via brew install qemu).

Note: at some point during this process -cdrom /dev/cdrom seems to have stopped working, but -cdrom /dev/disk2 works.

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Building Janet from source

Debian and macOS (Homebrew)

Here's a script I use to install Janet from source on Linux machines:

#!/bin/bash

set -e -o pipefail

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Identify Raspberry Pi model from the command line

Thanks to the API at perturb.org, this is a one-liner:

$ curl -L perturb.org/rpi?rev=$(awk '/^Revision/ { print $3 }' /proc/cpuinfo)
Revision : a02082
Model    : 3 Model B
Memory   : 1 GB
Overvolt : No

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Building Janet 1.8.1 on OS X 10.4 (Tiger)

posix_spawn isn't available on Tiger

Open source components of 10.4.11: https://opensource.apple.com/release/mac-os-x-10411ppc.html

curl -s https://opensource.apple.com/tarballs/xnu/xnu-792.24.17.tar.gz | gunzip | strings | grep posix_spawn does not yield any hits.

Here is a reference to ninja not building on Tiger due to missing posix_spawn: https://trac.macports.org/attachment/ticket/58099/patch-tiger-no-posix-spawn-2.diff

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Installing Python 2 and 3 on various systems

Reminder to self about how to install and invoke Python 2 vs. 3 on the various platforms I use.

See also https://xkcd.com/1987/

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One-time sshd on Windows/MSYS2

Need to ssh into your Windows machine? Open up an MSYS2 terminal and run:

$ ssh-keygen -A
$ /usr/bin/sshd -D

This runs sshd in the foreground. Press Control-C when finished.

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Log of tigerbrew build errors on my eMac

See also Installing OS X Tiger (10.4) on an eMac

2020/4/29: coreutils

brew install coreutils