Bare metal Squeak for Raspberry Pi

With a proper dev environment setup, running make should result in a kernel.img being generated.
Copy that and an Squeak/Scratch/eToys image onto an SD card, and then setup a config.txt to look like:

initramfs squeak.image 0x00800000

And it should load. And then probably hang and crash. But there's a watchdog timer setup to save you from having to power cycle.

Alternatively there is a zip containing all of the files necessary to make a bootable SD card:

https://raw.github.com/pablomarx/RaspberrySqueak/master/sd-card-ready.zip

Unzipping that onto a FAT formatted SD card should result in a bootable RaspberrySqueak.