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Full Discussion: Need help with OBP.
Top Forums UNIX for Dummies Questions & Answers Need help with OBP. Post 302530892 by Perderabo on Wednesday 15th of June 2011 09:41:51 AM
Old 06-15-2011
EEPROM is electrically erasable programmable read only memory. It is used on the sparc to store a little program that runs automatically when the system turns on. The name of the program is OBP. PC's work the same way, but on a PC, the name of the program is bios. When a program is stored in EEPROM it is called firmware. NVRAM is non-volatile random access memory. On the sparc it is used by OBP to store stuff like the boot paths. Typically, OBP will read the boot path, which points to some disk, and load the boot block (very first sector). The boot block is supposed to then boot the kernel.

On a PC you can interrupt the boot process and talk to the bios. On my PC, I must hit F12, then I see a menu presented by the bios. On a sparc, all you get is a command line interface when you talk to OBP. And OBP's prompt is often just "OK>".
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installgrub(1M)                                                                                                                    installgrub(1M)

NAME
installgrub - install GRUB in a disk partition or a floppy SYNOPSIS
/sbin/installgrub [-fm] stage1 stage2 raw-device The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader. installgrub installs GRUB stage 1 and stage 2 files on the boot area of a disk partition. If you specify the -m option, installgrub installs the stage 1 file on the master boot sector of the disk. The installgrub command accepts the following options: -f Suppresses interaction when overwriting the master boot sector. -m Installs GRUB stage1 on the master boot sector interactively. The installgrub command accepts the following operands: stage1 The name of the GRUB stage 1 file. stage2 The name of the GRUB stage 2 file. raw-device The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable. For disk devices, specify the slice where the GRUB menu file is located. (For Solaris it is the root slice.) For a floppy disk, it is /dev/rdiskette. Example 1: Installing GRUB on a Hard Disk Slice The following command installs GRUB on a system where the root slice is c0d0s0: example# /sbin/installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c0d0s0 Example 2: Installing GRUB on a Floppy The following command installs GRUB on a formatted floppy: example# mount -F pcfs /dev/diskette /mnt # mkdir -p /mnt/boot/grub # cp /boot/grub/* /mnt/boot/grub # umount /mnt # cd /boot/grub # /sbin/installgrub stage1 stage2 /dev/rdiskette /boot/grub Directory where GRUB files reside. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5) Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always boot the GRUB in the Solaris partition regardless of which fdisk partition is active. 24 May 2005 installgrub(1M)
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