Its latest entry, published in October 2013: Firmware updates for MacBooks that don’t dual boot OSX:
The rest of the blog.
My Macbook currently hosts Ubuntu, and there is no copy of OSX on it.
I keep a USB stick with OSX installed on it, and today I got to test if I could use this to install a firmware update.
Short version: It just works. Slightly longer version: I just rebooted a few times, holding down alt/option whenever I needed to boot OSX from the USB stick. The OSX software updater took care of the rest.
The web can be a great source of information you can't find elsewhere, and in that realm, I'd like to recommend "The Fine Art of Being Come Out To - A Straight Person's Guide to Gay Etiquette". Very funny, and true enough. Sadly, the host appears to have gone, so the link is into The Internet Archive.