Vitaly Wool describes running 2.6.33 on an ST microcontroler with 2MB flash and 256K ram
Linux for Microcontrollers: Spreading the Disease (PDF) (presented at ELC in April 2014) TO http://elinux.org/images/c/ca/Spreading.pdf
Someone is running an old version of BSD on a small processor with only 128K (that's right 'K'!!) of RAM.
