Default
Mass
Storage
Variable
The
boot ROM is responsible for setting up
the
default mass storage variable, DEFAULT_MSUS.
It
is
used by OSs for
three
purposes as the:
• Default MSUS for operating systems
• Device from which
to
load
an
AUTOSTART program,
and
• Device from which
to
do a secondary load.
The
DEFAULT _MSUS is set according
to
the
following algorithm:
1.
Same as
the
MSUS of
the
booted OS for all
but
ROM OS, or
a. A non-ROM value passed in DEFAULT_MSUS to
the
booter routine (this
is
done
only by
OSs calling
the
booter, not by the Boot ROM itself),
or
b.
The
first device found with LIF, SDF, or UNIX formatted media present if ROM
is specified in DEFAULT _MSUS, or
c.
The
first device found present in
the
boot list if ROM
is
specified in DE-
FAULT_MSUS
and
no media can be found (i.e.,
an
on-line disc drive with no media
present), or
d. A LIF media in
an
HP
8290XM drive
at
HP-IB 700 drive
0,
if ROM
is
specified in
DEFAULT_MSUS
and
no devices are present.
98
Boot Rom Functions
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