Figure 2-1 Default Boot Mode - Sun Microsystems SPARCstation Voyager Service Manual

Power on
No
Keyboard
attached?
Yes
Yes
Stop-D
keys?
No
Yes
diag-switch?
true
No
Probe SBus
devices and
interpret their
drivers
Go
to A
FIGURE 2-1
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.
8 SPARCstation Voyager Service Manual • December 1994
Run POST
Display errors
No
POST on keyboard
passed? LEDs and serial
Yes
Default Boot Mode
and run high level
"Testing Memory"
Yes
port A
Boot from device
alias "net"
A
Display banner
tests. Display
No
Auto-boot?
prompt
true
Yes
diag-switch?
true
No (default)
Boot from device
alias "disk"
or "net"
Boot user
specified device
and program
ok