Monitoring CPU/chassis temperatures on a first-generation x2100 (no SMDC)?

We have a first-gen x2100 that does not have a SMDC; its bios is fully up to date (v1.1.8). We'd like to be able to monitor system temperatures (and, ideally, fan speeds). This seems reasonable, especially since CPU and chassis temperatures as well as fan speeds are reported in real time in the BIOS. We're using OpenSolaris 2008.11, but all of the "tutorials" and command references I've found online that indicate where temperature and other info might be found yield no useful information (or an error) on this system:
prtdiag -v ==> no temp info
smbios ==> no temp info
ipmitool str ==> "Could not open bmc device: No such file or directory; Unable to open SDR for reading"
batstat -t ==> "No thermal zones."
I've not found any mention of the SMDC being required to access thermal info, but is that the case? The BIOS is able to monitor temperatures and fan speed, so it seems reasonable that userland tools should be able to do the same. FYI, I've not yet tried the ILOM at all; I'd like to be able to access this info in userland.
Any thoughts?

Yes, I know the SMDC can be used to monitor those sensors, but like I said, we don't have an SMDC. The sensor readings are clearly available from the BIOS, and it seems reasonable that they'd be available without the SMDC.
If that's not the case, that seems to be a pretty poor design decision (it's been many years since I've seen a computer [even very low-budget desktops] that don't make available temperature readings to capable operating systems, etc). Clearly something that's been addressed in the x2100 M2, but unfortunate nonetheless.

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