Chapter 6 Diagnostics 6-31
6.11.1 Auto-Boot Options
The auto-boot? setting controls whether or not the firmware automatically boots
the operating system after each reset. The default setting is true.
The auto-boot-on-error? setting controls whether the system attempts a
degraded boot when a subsystem failure is detected. Both the auto-boot? and
auto-boot-on-error? settings must be set to true to enable an automatic
degraded boot.
● To set the switches, type:
Note – The default setting for auto-boot-on-error? is false. Therefore, the
system does not attempt a degraded boot unless you change this setting to true. In
addition, the system will not attempt a degraded boot in response to any fatal non-
recoverable error, even if degraded booting is enabled. For examples of fatal non-
recoverable errors, see “Error Handling Summary” on page 31.
6.11.2 Error Handling Summary
Error handling during the power-on sequence falls into one of the following three
cases:
■ If no errors are detected by POST or OpenBoot Diagnostics, the system attempts
to boot if auto-boot? is true.
■ If only non-fatal errors are detected by POST or OpenBoot Diagnostics, the
system attempts to boot if auto-boot? is true and auto-boot-on-error? is
true.
Note – If POST or OpenBoot Diagnostics detects a non-fatal error associated with
the normal boot device, the OpenBoot firmware automatically unconfigures the
failed device and tries the next-in-line boot device, as specified by the boot-device
configuration variable.
■ If a fatal error is detected by POST or OpenBoot Diagnostics, the system does not
boot regardless of the settings of auto-boot? or auto-boot-on-error?. Fatal
non-recoverable errors include the following:
■ All CPUs failed
ok setenv auto-boot? true
ok setenv auto-boot-on-error? true
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