it seems to be a silo problem. Netbooting should work just fine.
Fabio
** Changed in: linux-source-2.6.15 (Ubuntu)
Sourcepackagename: linux-source-2.6.15 => silo
Assignee: Fabio Massimo Di Nitto => Ben Collins
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SPARC boot failed: Illegal Instruction
https://launchpad.net/bugs/40119