BIOS Quick Reference • CC5-RAVE
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NumLock
Parameter
NumLock
defines the state of the <Num> key during boot.
Configuring Drive Assignment Order
Embedded BIOS allows the user to map a different file system to each drive letter. The BIOS
allows file systems for each floppy (Floppy0 and Floppy1), each IDE drive (Ide0, Ide1, Ide2, and
Ide3), and memory disks when configured (Flash0, ROM0, RAM0, etc.) The figure above shows
how the first floppy drive (Floppy0) is assigned to drive A: in the system, and then how the first
IDE drive (Ide0) is assigned to drive C: in the system. To switch two floppy disks around or two
hard disks around, just map Floppy0 to B: and Floppy1 to A:, and for hard disks map Ide0 to D:
and Ide1 to C:.
Caution:
Take care to not skip drive A: when making floppy disk assignments, as well as drive C:
when making hard disk assignments. The first floppy should be A:, and the first hard drive
should be C:. Also, do not assign the same file system to more than one drive letter. Thus,
Floppy0 should not be used for both A: and B:. The BIOS permits this to allow embedded
devices to alias drives, but desktop operating systems may not be able to maintain cache
coherency with such a mapping in place.
Boot Order
This section defines the order in which the logical drives are scanned during the boot procedure.
To avoid unnecessary delays of the boot procedure, you should only enter logical drives that are
assigned to physical drives. Embedded BIOS supports up to five different user-defined steps in
the boot sequence. When the entire system has been initialized, POST executes these steps in
order until an operating system successfully loads. In addition, other pre-boot features can be
run before, after, or between operating system load attempts. The following actions can be
used:
Drive A
: - K: Boot operating system from specified drive. If “Loader” (see ‘Drive Assignment
Order’) is set to “BootRecord” or “Unused”, then the standard boot record will be invoked,
causing DOS, Windows95/98, Windows NT, or other industry-standard operating systems to
load (currently the loader option is preset to ‘Unused’ an cannot be changed by the user).
Debugger
Launch the integrated BIOS Debugger. To return to the boot process from the
debugger environment, type “G” at the debugger prompt and press ENTER.
None
No action; POST proceeds to the next activity in the sequence.
