Sweetu -
On the Power Systems, there is no BIOS. The closest thing to that is firmware, also called microcode. To determine the firmware running on your server, use the lsmcode command, specifically "lsmcode -c"... you will get something like:
The current permanent system firmware image is SF240_338
The current temporary system firmware image is SF240_358
The system is currently booted from the temporary firmware image.
This is an older Power5 server and it is running SF240_358.
Again, there is no BIOS, just firmware. Is this what you are looking for?
joe