User's Manual

NVRAM Boot Parameters OpenBoot Firmware
SPARC/CPU−56T 97
NVRAM Boot Parameters
The OpenBoot firmware holds its configuration parameters in NVRAM. To see a list of all
available configuration parameters, enter at the Forth Monitor prompt:
aprintenv
As you can see in the list, the default setting is for the CPU board to boot the operating
system automatically. If this is not the case, ensure that the <auto−boot?> parameter is set
to true.
To set specific parameters, use the setenv command as follows:
asetenv
<configuration_parameter> <value>
The configuration parameters in the following table are involved in the boot process.
Table 17: OpenBoot Configuration Parameters
Parameter Default Value Description
auto−boot? true If true, automatic booting after power on or reset
boot−device disk Device from which to boot
boot−file empty string File to boot
diag−switch? false If true, run in diagnostic mode, test results are
shown, boot up takes longer
If false, normal mode, short boot up
diag−device net Device from which to boot in diagnostic mode
diag−file
empty string File to boot in diagnostic mode
When booting an operating system or another stand−alone program, and neither a boot
device nor a filename is supplied, the boot command of the Forth monitor takes the
omitted values from the NVRAM configuration parameters. If the parameter
<diag−switch?> is false, the parameters <boot−device> and <boot−file> are used.
Otherwise, the OpenBoot firmware uses the parameters <diag−device> and <diag−file>
for booting.