SmallWall is supported only on the x86 (32bit) architecture. The types of devices supported range from standard PC's and virtual machines, to a variety of embedded devices. It is targeted at embedded x86-based PCs.

This excludes non-x86 devices like the MIPS-based Linksys devices, ARM-based D-Link devices, etc. FreeBSD does not support the MIPS platforms, and ARM support is very limited. For a list of FreeBSD supported platforms, see this page. Some shown there are experimental (like MIPS, for example). The only platform supported by SmallWall at this point is x86.