"As predicted, the open source community has come up with a way
to convert VxWorks-based LinkSys wireless WRT54G routers to Linux.
The process does not require hardware hacking, and installs a
recent version of 'DD-WRT micro.'
"A version of Linux that supports the VxWorks-based 'series 5'
WRT54G has been available since April, when the DD-WRT project
created its 'micro' edition, with a 1.7MB footprint. However, the
firmware could only be installed on routers modified to expose
their JTAG ports..."