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Solaris™ Operating Environment Boot Camp by Dominic Butler, David Rhodes

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The OpenBoot PROM

We've mentioned that when a Solaris server is switched on, we are presented with the OK prompt of the PROM, or monitor program, as it is also known. Its purpose is to enable us to:

  • Identify basic system information

  • Set the boot device

  • Boot the system from local disk

  • Boot the system across the network

  • Perform hardware checks

  • Modify Electrically Erasable/Programmable ROM (EEPROM) parameters

  • Recover from a hung system

Since revision 2, the Solaris PROM has been called the OpenBoot PROM (OBP). The aim of this was to end up with a firmware that could probe hardware devices installed within the system and automatically download the required device driver from the device into the PROM.

The PROM actually consists of a chip on the system board ...

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