obp_helper Daemon

obp_helper(1M) is responsible for starting processors other than the boot processor. It communicates with OBP through bootbus SRAM(BBSRAM), responding to requests to supply the time-of-day, get or put the contents of the pseudo-EEPROM, and release slave processors when in multiprocessor mode. To release the slave processors, obp_helper(1M) must load download_helper into the BBSRAM of all the slave processors, place an indication in BBSRAM that it is a slave processor, then start the processor by releasing the bootbus controller reset.

The bringup(1M) command starts obp_helper(1M) in the background, which kills the previous obp_helper(1M), if one exists. obp_helper(1M) runs download_helper and subsequently downloads and runs OBP.

For more information, see the obp_helper(1M), and bringup(1M) man pages and "download_helper File".