You specify the boot device by setting an OpenBoot configuration variable called boot-device. The default setting of this variable is disk net. Because of this setting, the firmware first attempts to boot from the system hard drive, and if that fails, from the on-board NET0 Gigabit Ethernet interface.
This procedure assumes that you are familiar with the OpenBoot firmware and that you know how to enter the OpenBoot environment. For more information, see the SPARC Enterprise T5120 and T5220 Servers Administration Guide.
Note - The serial management port on the ILOM card is preconfigured as the default system console port. For more information, see the SPARC Enterprise T5120 and T5220 Servers Adminstration Guide.
If you want to boot from a network, you must connect the network interface to the network.