8
SPARCstation Voyager Service Manual • December 1994
FIGURE 2-1
Default Boot Mode
This section describes how the various diagnostic tools work together in the
different power-on modes.
Note –
POST will run at power on if the
Stop-
D keys are pressed or the
diag-
switch?
parameter is set to true, or the keyboard is disconnected.
While the POST code executes, the Caps Lock LED on the keyboard flashes to
indicate that testing is in progress. If a failure occurs in POST, the failing replaceable
unit is encoded on three LEDs located on the keyboard and failure messages are
output to the serial port. See Chapter 3, “Power-On Self-Test (POST).
If the POST passes, the system probes for SBus devices and interprets their drivers.
Next, high-level tests are performed. You will see the words
Testing Memory
while the high-level tests are running. After
Testing Memory
is displayed, if you
want to use the OpenBoot PROM commands
(ok
prompt), press the
Stop-
A keys
simultaneously.
Power on
Keyboard
attached?
Stop-D
keys?
diag-switch?
true
Probe SBus
devices and
interpret their
drivers
Run POST
No
Yes
Yes
No
No
Yes
Go
to A
POST
passed?
Yes
No
Display errors
on keyboard
LEDs and serial
port A
A
Display banner
and run high level
tests. Display
"Testing Memory"
Auto-boot?
true
diag-switch?
true
Boot from device
alias "disk"
or "net"
Boot from device
alias "net"
Boot user
specified device
and program
ok
prompt
Yes
Yes
No
No (default)
Summary of Contents for SPARCstation Voyager
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