Booting process
PA-RISC Boot process
-------------------------
1-- POST/PDC/IODC perform hardware self-tests and system initialization.
2-- BCH (boot console handler)consults NVRAM to identify the default boot device.
3-- Boot device/disk contains boot area with ISL utility, AUTO file and HPUX utility.
4-- isl/hpux use the auto file to choose and boot a kernel.
5-- vmunix/init complete the boot process.
Integrity Boot process
----------------------
1-- POST/PAL/SAL perform hardware self-tests and system initialization.
2-- EFI boot manager consults NVRAM to identify the default boot device.
3-- In boot disk there is a system partition with AUTO file and HPUX kernel loader.
4-- hpux.efi uses the auto file to choose and
boot a kernel
5-- vmunix/init complete the boot process
-------------------------
1-- POST/PDC/IODC perform hardware self-tests and system initialization.
2-- BCH (boot console handler)consults NVRAM to identify the default boot device.
3-- Boot device/disk contains boot area with ISL utility, AUTO file and HPUX utility.
4-- isl/hpux use the auto file to choose and boot a kernel.
5-- vmunix/init complete the boot process.
Integrity Boot process
----------------------
1-- POST/PAL/SAL perform hardware self-tests and system initialization.
2-- EFI boot manager consults NVRAM to identify the default boot device.
3-- In boot disk there is a system partition with AUTO file and HPUX kernel loader.
4-- hpux.efi uses the auto file to choose and
boot a kernel
5-- vmunix/init complete the boot process
1.Power on server.
2.PDC gets invoked.
3.Initialise all i/o devices using IODC calls
4.Then it reads the stable storage to find the boot disk.
5.Once it finds the boot disk, it loads the primary boot loader ISL into the memory.
6.ISL finds and executes the autoexecute file which requests the secondary loader hpux be run with appropriate arguments.
7.Then HPUX loads kernel into the memory and given the control to kernel.
8.Now onwards, kernel load the remaining boot process which includes init, swapper, and other startup daemons.
2.PDC gets invoked.
3.Initialise all i/o devices using IODC calls
4.Then it reads the stable storage to find the boot disk.
5.Once it finds the boot disk, it loads the primary boot loader ISL into the memory.
6.ISL finds and executes the autoexecute file which requests the secondary loader hpux be run with appropriate arguments.
7.Then HPUX loads kernel into the memory and given the control to kernel.
8.Now onwards, kernel load the remaining boot process which includes init, swapper, and other startup daemons.
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