I've just updated the BIOS on my home W2100z (downloaded from here).
The old BIOS on the machine was antique. I mean, it predates all the old versions on the download page. And I remember updating it at least once (to get PXE boot working), so it wasn't the factory version.
The update was pretty smooth. However, on booting back into Solaris I see a CPU pegged and very high interrupt rates. Not good.
Now, it turns out that I've stumbled across this before. And in response to that, Alan Hargreaves got the thermal zone driver backported to Solaris 10. So it's available in patch 125107.
Unfortunately getting hold of this patch is proving troublesome because sunsolve is broken again.
OK, so I go have a cup of coffee and this time, success. Patch applied and just save this blog before I reboot.