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.