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HP Recommended. Product: HP Stream For network cards, this is usually when you see the prompt that lets you specify what kind of boot protocol it should support like PXE or RPL. Option ROMs should usually not do anything fancy at this point, except initialize hardware, run self-tests and set up boot service BBS entry points. Once all extensions have been allowed to run and add their boot service entry points, control goes back to the BIOS. At this point all the add-on cards and internal services of the BIOS have been initialized and are ready to do work.
All of the boot service entry points are ordered according to the configuration specified in the BIOS. It is quite common that the user is given a choice of which boot service to try first by pressing a hotkey.
F12 is a common key to start a boot service offered by a network card, but this varies among manufacturers. Once the first boot service has been selected, either manually or automatically, control moves to the next step.
Start first boot service in BIOS boot services list During this stage, the program indicated by the boot service entry point is started.
At this point, control passes to the boot service program, which starts its discovery process for a boot program. Boot service performs discovery for boot program Different boot services go about looking for the boot program in different ways. A floppy controller will read the first sector of the floppy and get ready to start that piece of code. If a location is advertised, a TFTP request is performed to fetch the boot program, commonly referred to as a network boot program NBP.
If the boot service was unable to find a valid boot program, the boot service will exit and control returns back to the BIOS, which will try the next boot service.
If a boot program was successfully found, control will be handed over to it. Remove first boot service or put at bottom of list The BIOS needs to cycle to the next boot service in its list. Both methods have pros and cons. The next step is to figure out if there are any more boot services to try out. More boot services available?
If there are more boot services available, the next one in line will be started. If there are no more boot services the computer will halt and perform its halt operation.
Start boot program At this point the boot program is in full control of the computer, and it will start doing whatever it is supposed to do. If the boot program detects a problem or wishes to, it can return back to the BIOS.
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