Hmmm, I take that back. This is a dump of the configuration from my switch (upgraded to firmware 1.0.5):
ebay_voltaire_isr9024d-m_original-repository.new_firmware-1.0.5
There doesn't seem to be anything in there related to com1. But, it's a very long file (much longer than from firmware 0.8.6), and I could have just been looking for an incorrect string. So it still might help.
Out of curiosity, where are you running the "printenv" command? I can run it on the switch here and copy-n-paste the output if it's helpful.
As a thought, when logged into the system via telnet there is a "factory-default" command in the config menu. It's description is:
Switches back to factory default, and reboots the system.
Maybe that would work?