System Administration Guide: Basic Administration

Support for Booting Multiple Kernels

On SPARC based systems, when you boot the system from the ok prompt, the default boot device is automatically selected. An alternate boot device can be specified by changing the NVRAM variable for the boot-device. You can also specify an alternate boot device or an alternate kernel (boot file) from the command line at boot time. See SPARC: How to Boot a Kernel Other Than the Default Kernel.