The OpenBlockS firmware is a ram disk image file containing Linux kernel and userland (commands and libraries).

The firmware is loaded onto the onboard flash ROM. During boot, the firmware is loaded from the flash ROM, the kernel is executed, and a RAM disk is created from the expanded RAM disk image.

You can also boot an OS from a Compact Flash card in the internal slot instead.

You can check the firmware version that is currently loaded on your system with the uname command.

obs600# uname -ov
#1 Fri Aug 14 15:02:25 JST 2009 SSD/Linux 0.5-RELEASE-20090813