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BOOT_SPARC64(8) System Manager's Manual (sparc64) BOOT_SPARC64(8)

boot_sparc64sparc64 system bootstrapping procedures

When powered on, after a panic, or if the system is rebooted via reboot(8) or shutdown(8), the PROM will proceed to its initialization, and will boot an operating system if autoboot is enabled.

System boot blocks are installed near the start of the boot disk using the procedure described in installboot(8). The boot program attempts to load the kernel from the selected boot device, which must currently be an SCSI (“sd”) or IDE (“wd”) disk drive, or a CD-ROM (“cd”), or an SCSI tape drive (“st”).

The UltraSPARC Open Firmware will normally look for a bootloader on the device specified by the variable. The OpenBSD bootloader will then look for a kernel named bsd by default, unless the boot-file variable is set, or a different filename has been specified in the boot command. To reset this variable to its default, empty, value, type the following:

ok set-default boot-file

Autoboot is enabled by setting the variable to “true”, and is the factory default.

The following options are recognized:

Prompt for the root filesystem and swap devices after the devices have been configured.
Enter the “User Kernel Configuration” mode upon startup (see boot_config(8)).
Enter the debugger, ddb(4), as soon as the kernel console has been initialized.
Boot the system single-user. The system will be booted multi-user unless this option is specified.

If the sysctl(8) variable is enabled, at any time you can break back to the ROM by pressing the “L1” (also known as the “stop key”) and “a” keys at the same time (if the console is a serial port the same is achieved by sending a “break”), and entering machine prom at the prompt. If you do this accidentally you can continue whatever was in progress by typing go at the PROM prompt, and then cont to return to the system.

default system kernel
standalone installation kernel, suitable for disaster recovery
primary bootstrap for “ffs” file system
secondary bootstrap (usually also installed as /ofwboot)
network bootstrap

ddb(4), boot_config(8), halt(8), init(8), installboot(8), reboot(8), savecore(8), shutdown(8)

January 3, 2010 OpenBSD-5.3