IBM 4846-545 Service Guide - Page 40

Power, interruption, during, flash, update, procedure, Repairing

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Power interruption during flash BIOS update procedure If power is interrupted during the flash BIOS update procedure, the BIOS could become corrupted. Should this event occur, the system boots automatically from a backup copy of BIOS. To repair the corrupt version of BIOS and return to using the normal BIOS, repeat the steps to update the flash BIOS. Repairing the flash BIOS Two separate copies of POST/BIOS are maintained in separate flash modules. Should the primary copy become corrupt, the system automatically runs from the backup copy when rebooted. A POST message indicates when the backup copy is in use. When this happens, it is important to perform a Flash Update, in an attempt to repair the primary copy and preserve the backup functionality. If the primary is permanently damaged, the system runs normally, but without backup capability for the BIOS, and the POST message appears at each boot up. 18 Models 545 and 565 Hardware Service Guide

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Power
interruption
during
flash
BIOS
update
procedure
If
power
is
interrupted
during
the
flash
BIOS
update
procedure,
the
BIOS
could
become
corrupted.
Should
this
event
occur,
the
system
boots
automatically
from
a
backup
copy
of
BIOS.
To
repair
the
corrupt
version
of
BIOS
and
return
to
using
the
normal
BIOS,
repeat
the
steps
to
update
the
flash
BIOS.
Repairing
the
flash
BIOS
Two
separate
copies
of
POST/BIOS
are
maintained
in
separate
flash
modules.
Should
the
primary
copy
become
corrupt,
the
system
automatically
runs
from
the
backup
copy
when
rebooted.
A
POST
message
indicates
when
the
backup
copy
is
in
use.
When
this
happens,
it
is
important
to
perform
a
Flash
Update,
in
an
attempt
to
repair
the
primary
copy
and
preserve
the
backup
functionality.
If
the
primary
is
permanently
damaged,
the
system
runs
normally,
but
without
backup
capability
for
the
BIOS,
and
the
POST
message
appears
at
each
boot
up.
18
Models
545
and
565
Hardware
Service
Guide