pdc man page on HP-UX

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pdc(1M)								       pdc(1M)

       pdc - processor-dependent code (firmware)

       is  the firmware that implements all processor-dependent functionality,
       including initialization and self-test of the processor.	 Upon  comple‐
       tion,  it  loads	 and  transfers	 control  to the initial system loader
       (isl(1M)).  Firmware behavior varies somewhat, depending on  the	 hard‐
       ware as described below.

       To  load	 from  an  external medium, must know the particular device on
       which resides.  Typically the device is identified by the Primary  Boot
       Path  that is maintained by in Stable Storage.  A path specification is
       an I/O subsystem mnemonic that varies according to hardware model.

       When the processor is reset after  initialization  and  self-test  com‐
       plete, reads the Console Path from Stable Storage, and attempts to ini‐
       tialize the console device.  If the initialization fails,  attempts  to
       find  and  initialize a console device.	Algorithms used to find a con‐
       sole device are model-dependent.	  then	announces  the	Primary	 Boot,
       Alternate Boot, and Console Paths.

       If  (see	 isl(1M)) is enabled, provides a 10-second delay, during which
       time the operator can override the sequence by typing any character  on
       the console.  If the operator does not interrupt this process, initial‐
       izes and reads from the Primary Boot  Path.   On	 models	 that  support
       autosearch,  if	this  path  is not valid and (see isl(1M)) is enabled,
       then searches to find a bootable medium.

       If allowed to complete, a list of potentially bootable devices is  dis‐
       played,	labeled	 with  abbreviated  path identifiers (P0, P1, etc).  A
       simple menu is then displayed where the user can:

	      ·	 Boot a specific device, using the  abbreviated	 path  identi‐
		 fier, or the full mnemonic.

	      ·	 Start a device search where the contents are searched for IPL
		 images (note the first search only identified devices and did
		 not check the contents).

	      ·	 Enter the boot administration level.

	      ·	 Exit the menu and return to autobooting

	      ·	 Get help on choices

       If  the	sequence  is  unsuccessful, overridden by the operator, or not
       enabled in the first place, interactively prompts the operator for  the
       Boot  Path  to use.  Any required path components that are not supplied
       default to zero.

       The Primary Boot, Alternate Boot, and Console  Paths  as	 well  as  and
       enable can be modified via

       boot(1M), isl(1M).

			     PA-RISC Systems Only		       pdc(1M)

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